2004 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX … · sensor connector. 4 CHECK FRONT OXYGEN (A/F) SENSOR. Measure the resistance between front oxygen (A/F) sensor connector terminals

2004 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX

ENGINE SECTION 1

This service manual has been preparedto provide SUBARU service personnelwith the necessary information and datafor the correct maintenance and repairof SUBARU vehicles.This manual includes the proceduresfor maintenance, disassembling, reas-sembling, inspection and adjustment ofcomponents and diagnostics for guid-ance of experienced mechanics.Please peruse and utilize this manualfully to ensure complete repair work forsatisfying our customers by keepingtheir vehicle in optimum condition.When replacement of parts duringrepair work is needed, be sure to useSUBARU genuine parts.

All information, illustration and specifi-cations contained in this manual arebased on the latest product informationavailable at the time of publicationapproval.

FUJI HEAVY INDUSTRIES LTD.

FUEL INJECTION (FUEL SYSTEMS) FU(H4SO)

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

EC(H4SO)

INTAKE (INDUCTION) IN(H4SO)

MECHANICAL ME(H4SO)

EXHAUST EX(H4SO)

COOLING CO(H4SO)

LUBRICATION LU(H4SO)

SPEED CONTROL SYSTEMS SP(H4SO)

IGNITION IG(H4SO)

STARTING/CHARGING SYSTEMS SC(H4SO)

ENGINE (DIAGNOSTICS) EN(H4SO)(diag)

FUEL INJECTION (FUEL SYSTEMS) FU(H4SOw/oOBD)

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

EC(H4SOw/oOBD)

INTAKE (INDUCTION) IN(H4SOw/oOBD)

MECHANICAL ME(H4SOw/oOBD)

EXHAUST EX(H4SOw/oOBD)

COOLING CO(H4SOw/oOBD)

G1870GE2

2004 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX

ENGINE SECTION 1

LUBRICATION LU(H4SOw/oOBD)

SPEED CONTROL SYSTEMS SP(H4SOw/oOBD)

IGNITION IG(H4SOw/oOBD)

STARTING/CHARGING SYSTEMS SC(H4SOw/oOBD)

ENGINE (DIAGNOSTICS) EN(H4SOw/oOBD)(diag)

G1870GE2

ENGINE (DIAGNOSTICS)Diagnostic Procedure with Diagnostic Trouble Code (DTC)

19.Diagnostic Procedure with Diagnostic Trouble Code (DTC)A: DTC P0030 HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1)• DTC DETECTING CONDITION:

• Two consecutive driving cycles with fault

CAUTION:After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-40, Inspection Mode.>.• WIRING DIAGRAM:

EN-01421

B18

3 41 2

5 6

B47 F44

1 2 3 45 6 7 8

B136 B135

1234

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

SBF-5

EE

B47

B18

64

53

21

43 12

B2

3C

13

C2

2

C6

C1

7

C1

6C

58

B:

C:

B135

B136

B22

E3

ECM

BATTERY

B61 F44

2

FRONT OXYGEN(A/F) SENSOR

MAIN RELAY

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHDLHD

RH

D

RH

D

EN(H4SO)(diag)-80


Step Check Yes No1 CHECK HARNESS BETWEEN ECM AND

FRONT OXYGEN (A/F) SENSOR CONNEC-TOR.1)Start the engine and warm-up engine.2)Turn the ignition switch to OFF.3)Disconnect the connectors from ECM and front oxygen (A/F) sensor.4)Measure the resistance of harness between ECM and front oxygen (A/F) sensor connector.

Connector & terminal(B136) No. 6 — (B18) No. 3:(B136) No. 17 — (B18) No. 3:

Is the resistance less than 1 Ω?

Go to step 2. Repair the open circuit in harness between ECM and front oxygen (A/F) sensor connector.

2 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNEC-TOR.Measure the resistance of harness between ECM and front oxygen (A/F) sensor connector.




3 CHECK HARNESS BETWEEN MAIN RELAY AND FRONT OXYGEN (A/F) SENSOR CON-NECTOR.Measure the resistance of harness between main relay and front oxygen (A/F) sensor con-nector.

Connector & terminal(B47) No. 4 — (B18) No. 4:



4 CHECK FRONT OXYGEN (A/F) SENSOR.Measure the resistance between front oxygen (A/F) sensor connector terminals.

TerminalsNo. 3 — No. 4:


Go to step 5. Replace the front oxygen (A/F) sen-sor. <Ref. to FU(H4SO)-43, Front Oxygen (A/F) Sensor.>

5 CHECK POOR CONTACT.Check the poor contact in ECM and front oxy-gen (A/F) sensor connector.

Is there poor contact in ECM or front oxygen (A/F) sensor con-nector?

Repair the poor contact in ECM or front oxygen (A/F) sensor connector.

Replace the front oxygen (A/F) sen-sor. <Ref. to FU(H4SO)-43, Front Oxygen (A/F) Sensor.>

EN(H4SO)(diag)-81


B: DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)• DTC DETECTING CONDITION:

• Immediately at fault recognition

CAUTION:After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-40, OPERATION, Inspection Mode.>.• WIRING DIAGRAM:

Step Check Yes No1 CHECK ANY OTHER DTC ON DISPLAY. Does the Subaru Select Moni-

tor or OBD-II general scan tool display DTC P0031 and P0037 at the same time?

Go to step 2. Go to step 5.

EN-01421

B18

3 41 2

5 6

B47 F44

1 2 3 45 6 7 8

B136 B135

1234

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

SBF-5

EE

B47

B18

64

53

21

43 12

B2

3C

13

C2

2

C6

C1

7

C1

6C

58

B:

C:

B135

B136

B22

E3

ECM

BATTERY

B61 F44

2


MAIN RELAY

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHDLHD

RH

D

RH

D

EN(H4SO)(diag)-82


2 CHECK POWER SUPPLY TO FRONT OXY-GEN (A/F) SENSOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from front oxygen (A/F) sensor.3)Turn the ignition switch to ON.4)Measure the voltage between front oxygen (A/F) sensor connector and engine ground.

Connector & terminal(B18) No. 4 (+) — Engine ground (−−−−):

Is the voltage more than 10 V? Go to step 3. Repair power sup-ply line.

NOTE:In this case, repairthe following:• Open circuit in harness between main relay and front oxygen (A/F) sensor connector• Poor contact in front oxygen (A/F) sensor connector• Poor contact in main relay connec-tor

3 CHECK GROUND CIRCUIT OF ECM.Measure the resistance of harness between ECM connector and chassis ground.

Connector & terminal(B136) No. 5 — Chassis ground:(B136) No. 16 — Chassis ground:


Go to step 4. Repair harness and connector.

NOTE:In this case, repairthe following:• Open circuit in harness between ECM and engine ground terminal• Poor contact in ECM connector• Poor contact in coupling connector

4 CHECK CURRENT DATA.1)Start the engine.2)Read the data of front oxygen (A/F) sensor heater current using Subaru Select Monitor or OBD-II general scan tool.

NOTE:•Subaru Select MonitorFor detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”. <Ref. to EN(H4SO)(diag)-32, Subaru Select Monitor.> •OBD-II scan toolFor detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.

Is the current more than 0.2 A? Repair poor con-tact in connector.

NOTE:In this case, repairthe following:• Poor contact in front oxygen (A/F) sensor connector• Poor contact in ECM connector

Go to step 5.

5 CHECK INPUT SIGNAL FROM ECM.1)Start and idle the engine.2)Measure the voltage between ECM connec-tor and chassis ground.

Connector & terminal(B136) No. 6 (+) — Chassis ground (−−−−):(B136) No. 17 (+) — Chassis ground (−−−−):

Is the voltage less than 1 V? Go to step 7. Go to step 6.

6 CHECK OUTPUT SIGNAL FROM ECM.Measure the voltage between ECM connector and chassis ground.


Does the voltage change by shaking the ECM harness and connector?

Repair poor con-tact in ECM con-nector.

Go to step 7.

Step Check Yes No

EN(H4SO)(diag)-83


7 CHECK FRONT OXYGEN (A/F) SENSOR.1)Turn the ignition switch to OFF.2)Measure the resistance between front oxy-gen (A/F) sensor connector terminals.



Repair harness and connector.

NOTE:In this case, repairthe following:• Open or ground short circuit in har-ness between front oxygen (A/F) sen-sor and ECM con-nector• Poor contact in front oxygen (A/F) sensor connector• Poor contact in ECM connector

Replace the front oxygen (A/F) sen-sor. <Ref. to FU(H4SO)-50, Fuel.>

Step Check Yes No

EN(H4SO)(diag)-84


C: DTC P0032 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1)• DTC DETECTING CONDITION:



Step Check Yes No1 CHECK OUTPUT SIGNAL FROM ECM.

1)Turn the ignition switch to ON.2)Measure the voltage between ECM connec-tor and chassis ground.


Is the voltage more than 8 V? Go to step 2. Go to step 3.

EN-01421

B18

3 41 2

5 6

B47 F44

1 2 3 45 6 7 8

B136 B135

1234

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

SBF-5

EE

B47

B18

64

53

21

43 12

B2

3C

13

C2

2

C6

C1

7

C1

6C

58

B:

C:

B135

B136

B22

E3

ECM

BATTERY

B61 F44

2


MAIN RELAY

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHDLHD

RH

D

RH

D

EN(H4SO)(diag)-85


2 CHECK FRONT OXYGEN (A/F) SENSOR HEATER CURRENT.1)Turn the ignition switch to OFF.2)Repair the battery short circuit in harness between ECM and front oxygen (A/F) sensor connector.3)Turn the ignition switch to ON.4)Read the data of front oxygen (A/F) sensor heater current using Subaru Select Monitor or the OBD-II general scan tool.

NOTE:•Subaru Select MonitorFor detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”. <Ref. to EN(H4SO)(diag)-32, Subaru Select Monitor.>•OBD-II general scan toolFor detailed operation procedure, refer to the OBD-II General Scan Tool Instruction Manual.

Is the current more than 2.3 A? Replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

END




Repair battery short circuit in har-ness between ECM and front oxygen (A/F) sen-sor connector.

END

Step Check Yes No

EN(H4SO)(diag)-86


D: DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2)• DTC DETECTING CONDITION:



EN-01422

BATTERYB61 F44

2

B47

MAIN RELAY

12

35

46

F44

1 2 3 45 6 7 8

C4

B1

4

B1

9D

15

C1

6C

5

REAR OXYGEN SENSOR

ECM

1 4 3

2

8

B22

B83

B19

E3

B47

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

3 45 6

1 2

1

B135B:

D: B137

SBF-5

C: B136

B137

415

326

1815 167 8 9 10 11

17 19 2012 13

14

B135

5 6 78

29

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

*

EE

1

B19

1234

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 5RHD : 4

LHD

RH

D

LHD

RH

D

EN(H4SO)(diag)-87


Step Check Yes No1 CHECK GROUND CIRCUIT OF ECM.

1)Turn the ignition switch to OFF.2)Disconnect the connector from ECM.3)Measure the resistance of harness between ECM connector and chassis ground.




NOTE:In this case, repairthe following:• Open circuit in harness between ECM and engine ground terminal• Poor contact in ECM connector• Poor contact in coupling connector

2 CHECK CURRENT DATA.1)Start the engine.2)Read the data of rear oxygen sensor heater current using Subaru Select Monitor or OBD-II general scan tool.

NOTE:•Subaru Select MonitorFor detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”. <Ref. to EN(H4SO)(diag)-32, Subaru Select Monitor.>•OBD-II scan toolFor detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.

Is the current more than 0.2 A? Repair the con-nector.

NOTE:In this case, repairthe following:• Poor contact in rear oxygen sen-sor connector• Poor contact in rear oxygen sen-sor connecting harness connector• Poor contact in ECM connector

Go to step 3.

3 CHECK OUTPUT SIGNAL FROM ECM.1)Start and idle the engine.2)Measure the voltage between ECM connec-tor and chassis ground.

Connector & terminal(B136) No. 4 (+) — Chassis ground (−−−−):






Go to step 5.

5 CHECK OUTPUT SIGNAL FROM ECM.1)Disconnect the connector from rear oxygen sensor.2)Measure the voltage between ECM connec-tor and chassis ground.


Is the voltage less than 1 V? Replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

Repair battery short circuit in har-ness between ECM and rear oxy-gen sensor con-nector. After repair, replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

EN(H4SO)(diag)-88


6 CHECK POWER SUPPLY TO REAR OXY-GEN SENSOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from rear oxygen sensor.3)Turn the ignition switch to ON.4)Measure the voltage between rear oxygen sensor connector and engine ground or chas-sis ground.


Is the voltage more than 10 V? Go to step 7. Repair power sup-ply line.

NOTE:In this case, repairthe following:• Open circuit in harness between main relay and rear oxygen sen-sor connector• Poor contact in rear oxygen sen-sor connector• Poor contact in coupling connector

7 CHECK REAR OXYGEN SENSOR.1)Turn the ignition switch to OFF.2)Measure the resistance between rear oxy-gen sensor connector terminals.




NOTE:In this case, repairthe following:• Open circuit in harness between rear oxygen sen-sor and ECM con-nector• Poor contact in rear oxygen sen-sor connector• Poor contact in ECM connector• Poor contact in coupling connector

Replace the rear oxygen sensor. <Ref. to FU(H4SO)-45, Rear Oxygen Sen-sor.>

Step Check Yes No

EN(H4SO)(diag)-89


E: DTC P0038 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 2)• DTC DETECTING CONDITION:



Step Check Yes No1 CHECK INPUT SIGNAL FOR ECM.

Measure the voltage between ECM connector and chassis ground.



EN-01422

BATTERYB61 F44

2

B47

MAIN RELAY

12

35

46

F44

1 2 3 45 6 7 8

C4

B1

4

B1

9D

15

C1

6C

5

REAR OXYGEN SENSOR

ECM

1 4 3

2

8

B22

B83

B19

E3

B47

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

3 45 6

1 2

1

B135B:

D: B137

SBF-5

C: B136

B137

415

326

1815 167 8 9 10 11

17 19 2012 13

14

B135

5 6 78

29

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

*

EE

1

B19

1234

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 5RHD : 4

LHD

RH

D

LHD

RH

D

EN(H4SO)(diag)-90


2 CHECK CURRENT DATA.1)Turn the ignition switch to OFF.2)Repair the battery short circuit in harness between ECM and rear oxygen sensor connec-tor.3)Turn the ignition switch to ON.4)Read the data of rear oxygen sensor heater current using Subaru Select Monitor or the OBD-II general scan tool.

NOTE:•Subaru Select MonitorFor detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”. <Ref. to EN(H4SO)(diag)-32, Subaru Select Monitor.> •OBD-II general scan toolFor detailed operation procedure, refer to the OBD-II General Scan Tool Instruction Manual.

Is the current more than 7 A? Replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

END

3 CHECK POOR CONTACT.Check poor contact in ECM connector.

Is there poor contact in ECM connector?


END

Step Check Yes No

EN(H4SO)(diag)-91


F: DTC P0066 AIR ASSISTED INJECTOR CONTROL CIRCUIT OR CIRCUIT LOW

• DTC DETECTING CONDITION:• Two consecutive driving cycles with fault

• TROUBLE SYMPTOM:• Erroneous idling• Engine stalls


EN-01423

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

1 2 3 45 6 7 89 10 11 1213 14 15 16

3 45 6

1 21 2 1 2 3 45 6 7 8

B134B22F44B47E42

B134 ECM

E42

E3

B22

1 71

212

AIR ASSISTINJECTORSOLENOID

VALVE

BATTERYSBF-5

2

B61 F44

MAIN RELAY

64

53

21

B47

E

LHD

RH

D

LHD

RH

D

EN(H4SO)(diag)-92



1)Turn ignition switch to ON.2)Measure voltage between ECM and chassis ground.


Is the voltage more than 10 V? Repair poor con-tact in ECM con-nector.

Go to step 2.

2 CHECK POWER SUPPLY TO AIR ASSIST IN-JECTOR SOLENOID VALVE.1)Turn ignition switch to OFF.2)Disconnect connector from air assist injector solenoid valve.3)Turn ignition switch to ON.4)Measure voltage between air assist injector solenoid valve and engine ground.

Connector & terminal(E42) No. 2 (+) — Engine ground (−−−−):

Is the voltage more than 10 V? Go to step 3. Repair harness and connector.

NOTE:In this case, repairthe following:• Open circuit in harness between air assist injector solenoid valve and main relay connec-tor• Poor contact in coupling connector

3 CHECK HARNESS BETWEEN ECM AND AIR ASSIST INJECTOR SOLENOID VALVE CON-NECTOR.1)Turn ignition switch to OFF.2)Disconnect connector from ECM.3)Measure resistance of harness between ECM and air assist injector solenoid valve con-nector.

Connector & terminal(B134) No. 12— (E42) No. 1:



NOTE:In this case, repairthe following:• Open circuit in harness between ECM and air assist injector solenoid valve connector• Poor contact in coupling connector

4 CHECK HARNESS BETWEEN ECM AND AIR ASSIST INJECTOR SOLENOID VALVE CON-NECTOR.Measure resistance of harness between ECM and chassis ground.

Connector & terminal(B134) No. 12— Chassis ground:

Is the resistance more than 1 MΩ?

Go to step 5. Repair ground short circuit in har-ness between ECM and air assist injector solenoid valve connector.

5 CHECK POOR CONTACT.Check poor contact in ECM and air assist injector solenoid valve connectors.

Is there poor contact in ECM and air assist injector solenoid valve connectors?

Repair poor con-tact in ECM and air assist injector solenoid valve connectors.

Replace air assist injector solenoid valve. <Ref. to FU(H4SO)-37, Air Assist Injector Solenoid Valve.>

EN(H4SO)(diag)-93


G: DTC P0067 AIR ASSISTED INJECTOR CONTROL CIRCUIT HIGH• DTC DETECTING CONDITION:

• Two consecutive driving cycles with fault• TROUBLE SYMPTOM:

• Erroneous idling• Engine stalls


EN-01423

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

1 2 3 45 6 7 89 10 11 1213 14 15 16

3 45 6

1 21 2 1 2 3 45 6 7 8

B134B22F44B47E42

B134 ECM

E42

E3

B22

1 71

212

AIR ASSISTINJECTORSOLENOID

VALVE

BATTERYSBF-5

2

B61 F44

MAIN RELAY

64

53

21

B47

E

LHD

RH

D

LHD

RH

D

EN(H4SO)(diag)-94



1)Turn ignition switch to ON.2)Measure voltage between ECM and chassis ground.



2 CHECK OUTPUT SIGNAL FROM ECM.1)Turn ignition switch to OFF.2)Disconnect connector from air assist injector solenoid valve.3)Turn ignition switch to ON.4)Measure voltage between ECM and chassis ground.


Is the voltage more than 10 V? Repair battery short circuit in har-ness between ECM and air assist injector solenoid valve connector. After repair, replace ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

Replace air assist injector solenoid valve <Ref. to FU(H4SO)-37, Air Assist Injector Solenoid Valve.> and ECM <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

3 CHECK OUTPUT SIGNAL FROM ECM.Measure voltage between ECM and chassis ground.



Repair battery short circuit in har-ness between ECM and air assist injector solenoid valve connector. After repair, replace ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

Contact with your Subaru distributor service.

NOTE:Inspection by DTMis required, be-cause probablecause is deteriora-tion of multipleparts.

EN(H4SO)(diag)-95


H: DTC P0107 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE CIRCUIT LOW INPUT

• DTC DETECTING CONDITION:• Immediately at fault recognition


19 3 15

MANIFOLDABSOLUTEPRESSURE

SENSOR9 15

12

B21

E2

1 23

E21

E21

ECM

B21

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

B135

B83

1

*

1 32

EN-01424

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

*LHD : 3RHD : 2

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

EN(H4SO)(diag)-96


Step Check Yes No1 CHECK CURRENT DATA.

1)Start the engine.2)Read the data of intake manifold absolute pressure signal using Subaru Select Monitor or OBD-II general scan tool.

NOTE:•Subaru Select MonitorFor detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”. <Ref. to EN(H4SO)(diag)-32, Subaru Select Monitor.>•OBD-II general scan toolFor detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.

Is the measured value less than 13.3 kPa (100 mmHg, 3.94 inHg)?


2 CHECK POOR CONTACT.Check poor contact in ECM and manifold absolute pressure sensor connector.

Is there poor contact in ECM or manifold absolute pressure sensor connector?

Repair poor con-tact in ECM or manifold absolute pressure sensor connector.

Even if malfunction indicator light lights up, the cir-cuit has returned to a normal condi-tion at this time.

3 CHECK OUTPUT SIGNAL FOR ECM.Measure the voltage between ECM connector and chassis ground.


Is the voltage more than 4.5 V? Go to step 5. Go to step 4.





Contact with SUB-ARU distributor service.


5 CHECK INPUT SIGNAL FOR ECM.Measure the voltage between ECM and chas-sis ground.


Is the voltage less than 0.2 V? Go to step 7. Go to step 6.

6 CHECK INPUT SIGNAL FOR ECM. (USING SUBARU SELECT MONITOR)Read the data of atmospheric absolute pres-sure signal using Subaru Select Monitor.

NOTE:•Subaru Select MonitorFor detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”. <Ref. to EN(H4SO)(diag)-32, Subaru Select Monitor.>

Is the measured value more than 13.3 kPa (100 mmHg, 3.94 inHg) by shaking the har-ness and connector of ECM?


Go to step 7.

EN(H4SO)(diag)-97


7 CHECK HARNESS BETWEEN MANIFOLD ABSOLUTE PRESSURE SENSOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from manifold absolute pressure sensor.3)Turn the ignition switch to ON.4)Measure the voltage between manifold abso-lute pressure sensor connector and engine ground.


Is the voltage more than 4.5 V? Go to step 8. Repair open circuit in harness between ECM and manifold absolute pressure sensor connector.

8 CHECK HARNESS BETWEEN MANIFOLD ABSOLUTE PRESSURE SENSOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from ECM.3)Measure the resistance of harness between ECM and manifold absolute pressure sensor connector.

Connector & terminal(B135) No. 19 — (E21) No. 1:


Go to step 9. Repair open circuit in harness between ECM and manifold absolute pressure sensor connector.

9 CHECK POOR CONTACT.Check poor contact in manifold absolute pres-sure sensor connector.

Is there poor contact in mani-fold absolute pressure sensor connector?

Repair poor con-tact in manifold absolute pressure sensor connector.

Replace the mani-fold absolute pres-sure sensor. <Ref. to FU(H4SO)-33, Manifold Absolute Pressure Sensor.>

Step Check Yes No

EN(H4SO)(diag)-98


I: DTC P0108 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE CIRCUIT HIGH INPUT



19 3 15

MANIFOLDABSOLUTEPRESSURE

SENSOR9 15

12

B21

E2

1 23

E21

E21

ECM

B21

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

B135

B83

1

*

1 32

EN-01424

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

*LHD : 3RHD : 2

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

EN(H4SO)(diag)-99



1)Start the engine.2)Read the data of intake manifold absolute pressure signal using Subaru Select Monitor or OBD-II general scan tool.

NOTE:•Subaru Select MonitorFor detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”. <Ref. to EN(H4SO)(diag)-32, Subaru Select Monitor.> •OBD-II general scan toolFor detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.

Is the measured value more than 119.5 kPa (896.5 mmHg, 35.29 inHg)?











4 CHECK INPUT SIGNAL FOR ECM.Measure the voltage between ECM connector and chassis ground.


Is the voltage less than 0.2 V? Go to step 6. Go to step 5.

5 CHECK INPUT SIGNAL FOR ECM. (USING SUBARU SELECT MONITOR)Read the data of atmospheric absolute pres-sure signal using Subaru Select Monitor.


Is the measured value more than 13.3 kPa (100 mmHg, 3.94 inHg) by shaking the har-ness and connector of ECM?


Go to step 6.

6 CHECK HARNESS BETWEEN MANIFOLD ABSOLUTE PRESSURE SENSOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from manifold absolute pressure sensor.3)Turn the ignition switch to ON.4)Measure the voltage between manifold abso-lute pressure sensor connector and engine ground.


Is the voltage more than 4.5 V? Go to step 7. Repair open circuit in harness between ECM and manifold absolute pressure sensor connector.

EN(H4SO)(diag)-100


7 CHECK HARNESS BETWEEN MANIFOLD ABSOLUTE PRESSURE SENSOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from ECM.3)Measure the resistance of harness between ECM and manifold absolute pressure sensor connector.




8 CHECK HARNESS BETWEEN MANIFOLD ABSOLUTE PRESSURE SENSOR AND ECM CONNECTOR.Measure the resistance of harness between ECM and manifold absolute pressure sensor connector.




9 CHECK POOR CONTACT.Check poor contact in manifold absolute pres-sure sensor connector.

Is there poor contact in mani-fold absolute pressure sensor connector?

Repair poor con-tact in manifold absolute pressure sensor connector.


10 CHECK HARNESS BETWEEN MANIFOLD ABSOLUTE PRESSURE SENSOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF and Subaru Select Monitor or the OBD-II general scan tool switch to OFF.2)Disconnect the connector from manifold absolute pressure sensor.3)Turn the ignition switch to ON and Subaru Select Monitor or the OBD-II general scan tool switch to ON.4)Read the data of intake manifold absolute pressure signal using Subaru Select Monitor or OBD-II general scan tool.


Is the measured value more than 119.5 kPa (896.5 mmHg, 35.29 inHg)?

Repair battery short circuit in har-ness between ECM and manifold absolute pressure sensor connector.


Step Check Yes No

EN(H4SO)(diag)-101


J: DTC P0111 INTAKE AIR TEMPERATURE CIRCUIT RANGE/PERFORMANCE• DTC DETECTING CONDITION:


• Erroneous idling• Poor driving performance


B1

9

D6

INTAKE AIRTEMPERATURE

SENSOR

9 14

B21

E2

2 1

E20

E20

ECMB137

B83

1

*

1 2

EN-01425

D:

B135B:

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

B137

415

326

1815 167 8 9 10 11

17 19 2012 13

14

B21

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 3RHD : 2

EN(H4SO)(diag)-102


Step Check Yes No1 CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect DTC using

“List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)-74, List of Diag-nostic Trouble Code (DTC).>

NOTE:In this case, it isnot necessary toinspectDTC P0111.

Go to step 2.

2 CHECK ENGINE COOLANT TEMPERA-TURE.1)Start the engine and warm it up completely.2)Measure the engine coolant temperature using Subaru Select Monitor or OBD-II general scan tool.


Is the engine coolant tempera-ture 75°C (167°F) — 95°C (203°F)?

Replace the intake air temperature sensor. <Ref. to FU(H4SO)-34, Intake Air Temper-ature Sensor.>

Inspect DTC P0125 using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)-74, List of Diag-nostic Trouble Code (DTC).>

EN(H4SO)(diag)-103


K: DTC P0112 INTAKE AIR TEMPERATURE CIRCUIT LOW INPUT• DTC DETECTING CONDITION:

• Immediately at fault recognition• TROUBLE SYMPTOM:



B1

9

D6


SENSOR

9 14

B21

E2

2 1

E20

E20

ECMB137

B83

1

*

1 2

EN-01425

D:

B135B:

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

B137

415

326

1815 167 8 9 10 11

17 19 2012 13

14

B21

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 3RHD : 2

EN(H4SO)(diag)-104



1)Start the engine.2)Read the data of intake air temperature sen-sor signal using Subaru Select Monitor or the OBD-II general scan tool.

NOTE:•Subaru Select MonitorFor detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”. <Ref. to EN(H4SO)(diag)-32, Subaru Select Monitor.> •OBD-II general scan toolFor detailed operation procedure, refer to the OBD-II General Scan Tool Instruction Manual.

Is the intake air temperature more than 120°C (248°F)?

Go to step 2. Repair poor con-tact.

NOTE:In this case, repairthe following:• Poor contact in intake air tempera-ture sensor• Poor contact in ECM• Poor contact in coupling connector• Poor contact in joint connector

2 CHECK HARNESS BETWEEN INTAKE AIR TEMPERATURE SENSOR AND ECM CON-NECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from intake air temperature sensor.3)Turn the ignition switch to ON.4)Read the data of intake air temperature sen-sor signal using Subaru Select Monitor or the OBD-II general scan tool.


Is the intake air temperature less than −40°C (−40°F)?


Repair ground short circuit in har-ness between intake air tempera-ture sensor and ECM connector.

EN(H4SO)(diag)-105


L: DTC P0113 INTAKE AIR TEMPERATURE CIRCUIT HIGH INPUT• DTC DETECTING CONDITION:




B1

9

D6


SENSOR

9 14

B21

E2

2 1

E20

E20

ECMB137

B83

1

*

1 2

EN-01425

D:

B135B:

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

B137

415

326

1815 167 8 9 10 11

17 19 2012 13

14

B21

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 3RHD : 2

EN(H4SO)(diag)-106



1)Start the engine.2)Read the data of intake air temperature sen-sor signal using Subaru Select Monitor or the OBD-II general scan tool.


Is the intake air temperature less than −40°C (−40°F)?


NOTE:In this case, repairthe following:• Poor contact in intake air tempera-ture sensor• Poor contact in ECM• Poor contact in coupling connector• Poor contact in joint connector

2 CHECK HARNESS BETWEEN INTAKE AIR TEMPERATURE SENSOR AND ECM CON-NECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from intake air temperature sensor.3)Measure the voltage between intake air tem-perature and manifold absolute pressure sen-sor connector and engine ground.


Is the voltage more than 10 V? Repair battery short circuit in har-ness between intake air tempera-ture sensor and ECM connector.

Go to step 3.

3 CHECK HARNESS BETWEEN INTAKE AIR TEMPERATURE SENSOR AND ECM CON-NECTOR.1)Turn the ignition switch to ON.2)Measure the voltage between intake air tem-perature sensor connector and engine ground.


Is the voltage more than 10 V? Repair battery short circuit in har-ness between intake air tempera-ture sensor and ECM connector.

Go to step 4.

4 CHECK HARNESS BETWEEN INTAKE AIR TEMPERATURE SENSOR AND ECM CON-NECTOR.Measure the voltage between intake air tem-perature sensor connector and engine ground.



NOTE:In this case, repairthe following:• Open circuit in harness between intake air tempera-ture sensor and ECM connector• Poor contact in intake air tempera-ture sensor• Poor contact in ECM• Poor contact in coupling connector• Poor contact in joint connector

EN(H4SO)(diag)-107


5 CHECK HARNESS BETWEEN INTAKE AIR TEMPERATURE SENSOR AND ECM CON-NECTOR.1)Turn the ignition switch to OFF.2)Measure the resistance of harness between intake air temperature sensor connector and engine ground.

Connector & terminal(E20) No. 2 — Engine ground:




NOTE:In this case, repairthe following:• Open circuit in harness between intake air tempera-ture sensor and ECM connector• Poor contact in intake air tempera-ture sensor• Poor contact in ECM• Poor contact in coupling connector• Poor contact in joint connector

Step Check Yes No

EN(H4SO)(diag)-108


M: DTC P0117 ENGINE COOLANT TEMPERATURE CIRCUIT LOW INPUT• DTC DETECTING CONDITION:


• Hard to start• Erroneous idling• Poor driving performance


EN-01426

1

*

B83

19

12

913

B135 ECM

21

E2

B21

E8

ENGINECOOLANT

TEMPERATURESENSOR

B21

1 2 3 45 6 7 8

9 10 11 1213 14 15 16

17 18 19 20

E8

1 23

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 3RHD : 2

EN(H4SO)(diag)-109



1)Start the engine.2)Read the data of engine coolant temperature sensor signal using Subaru Select Monitor or OBD-II general scan tool.


Is the engine coolant tempera-ture more than 150°C (302°F)?


NOTE:In this case, repairthe following:• Poor contact in engine coolant temperature sen-sor• Poor contact in ECM• Poor contact in coupling connector• Poor contact in joint connector

2 CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from engine cool-ant temperature sensor.3)Turn the ignition switch to ON.4)Read the data of engine coolant temperature sensor signal using Subaru Select Monitor or OBD-II general scan tool.


Is the engine coolant tempera-ture less than −40°C (−40°F)?

Replace the engine coolant temperature sen-sor. <Ref. to FU(H4SO)-27, Engine Coolant Temperature Sen-sor.>

Repair ground short circuit in har-ness between engine coolant temperature sen-sor and ECM con-nector.

EN(H4SO)(diag)-110


N: DTC P0118 ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUT• DTC DETECTING CONDITION:


• Hard to start• Erroneous idling• Poor driving performance


EN-01426

1

*

B83

19

12

913

B135 ECM

21

E2

B21

E8

ENGINECOOLANT

TEMPERATURESENSOR

B21

1 2 3 45 6 7 8

9 10 11 1213 14 15 16

17 18 19 20

E8

1 23

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 3RHD : 2

EN(H4SO)(diag)-111



1)Start the engine.2)Read the data of engine coolant temperature sensor signal using Subaru Select Monitor or OBD-II general scan tool.


Is the engine coolant tempera-ture less than −40°C (−40°F)?


NOTE:In this case, repairthe following:• Poor contact in engine coolant temperature sen-sor• Poor contact in ECM• Poor contact in coupling connector• Poor contact in joint connector

2 CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from engine cool-ant temperature sensor.3)Measure the voltage between engine coolant temperature sensor connector and engine ground.


Is the voltage more than 10 V? Repair battery short circuit in har-ness between ECM and engine coolant tempera-ture sensor con-nector.

Go to step 3.

3 CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.1)Turn the ignition switch to ON.2)Measure the voltage between engine coolant temperature sensor connector and engine ground.


Is the voltage more than 10 V? Repair battery short circuit in har-ness between ECM and engine coolant tempera-ture sensor con-nector.

Go to step 4.

4 CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.Measure the voltage between engine coolant temperature sensor connector and engine ground.



NOTE:In this case, repairthe following:• Open circuit in harness between ECM and engine coolant tempera-ture sensor con-nector• Poor contact in engine coolant temperature sen-sor connector• Poor contact in ECM connector• Poor contact in coupling connector• Poor contact in joint connector

EN(H4SO)(diag)-112


5 CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Measure the resistance of harness between engine coolant temperature sensor connector and engine ground.





NOTE:In this case, repairthe following:• Open circuit in harness between ECM and engine coolant tempera-ture sensor con-nector• Poor contact in engine coolant temperature sen-sor connector• Poor contact in ECM connector• Poor contact in coupling connector• Poor contact in joint connector

Step Check Yes No

EN(H4SO)(diag)-113


O: DTC P0121 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT RANGE/PERFORMANCE


• TROUBLE SYMPTOM:• Erroneous idling• Engine stalls.• Poor driving performance


EN-01427

19

133

911

12

B135

234

B21

E2

E13

THROTTLEPOSITIONSENSOR

1

*

ECM

B83

E13

1 2 3 4

B21

1 2 3 45 6 7 8

9 10 11 1213 14 15 16

17 18 19 20

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 3RHD : 2

EN(H4SO)(diag)-114


Step Check Yes No1 CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect DTC

P0122 or P0123 using “List of Diag-nostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)-74, List of Diag-nostic Trouble Code (DTC).>


Replace the throt-tle position sen-sor. <Ref. to FU(H4SO)-31, Throttle Position Sensor.>

EN(H4SO)(diag)-115


P: DTC P0122 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT LOW INPUT




EN-01427

19

133

911

12

B135

234

B21

E2

E13


1

*

ECM

B83

E13

1 2 3 4

B21

1 2 3 45 6 7 8

9 10 11 1213 14 15 16

17 18 19 20

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 3RHD : 2

EN(H4SO)(diag)-116



1)Start the engine.2)Read the data of throttle position sensor sig-nal using Subaru Select Monitor or OBD-II general scan tool.


Is the voltage less than 0.1 V? Go to step 2. Even if malfunction indicator light lights up, the cir-cuit has returned to a normal condi-tion at this time. A temporary poor contact of the con-nector may be the cause.

NOTE:In this case, repairthe following:• Poor contact in throttle position sensor connector• Poor contact in ECM connector• Poor contact in coupling connector

2 CHECK OUTPUT SIGNAL FOR ECM.Measure the voltage between ECM connector and chassis ground while throttle valve is fully closed.









4 CHECK INPUT SIGNAL FOR ECM.Measure the voltage between ECM connector and chassis ground.



5 CHECK INPUT SIGNAL FOR ECM. (USING SUBARU SELECT MONITOR.)Measure the voltage between ECM connector and chassis ground.




Go to step 6.

EN(H4SO)(diag)-117


6 CHECK HARNESS BETWEEN ECM AND THROTTLE POSITION SENSOR CONNEC-TOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from throttle posi-tion sensor.3)Turn the ignition switch to ON.4)Measure the voltage between throttle posi-tion sensor connector and engine ground.


Is the voltage more than 4.5 V? Go to step 7. Repair harness and connector.

NOTE:In this case, repairthe following:• Open circuit in harness between throttle position sensor and ECM connector• Poor contact in throttle position sensor connector• Poor contact in ECM connector• Poor contact in coupling connector• Poor contact in joint connector

7 CHECK HARNESS BETWEEN ECM AND THROTTLE POSITION SENSOR CONNEC-TOR.1)Turn the ignition switch to OFF.2)Measure the resistance of harness between ECM connector and throttle position sensor connector.




NOTE:In this case, repairthe following:• Open circuit in harness between throttle position sensor and ECM connector• Poor contact in ECM connector• Poor contact in throttle position sensor connector• Poor contact in coupling connector

8 CHECK HARNESS BETWEEN ECM AND THROTTLE POSITION SENSOR CONNEC-TOR.Measure the resistance of harness between throttle position sensor connector and engine ground.



Go to step 9. Repair ground short circuit in har-ness between throttle position sensor and ECM connector.

9 CHECK POOR CONTACT.Check poor contact in throttle position sensor connector.

Is there poor contact in throttle position sensor connector?

Repair poor con-tact in throttle posi-tion sensor connector.


Step Check Yes No

EN(H4SO)(diag)-118


Q: DTC P0123 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT HIGH INPUT




EN-01427

19

133

911

12

B135

234

B21

E2

E13


1

*

ECM

B83

E13

1 2 3 4

B21

1 2 3 45 6 7 8

9 10 11 1213 14 15 16

17 18 19 20

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 3RHD : 2

EN(H4SO)(diag)-119



1)Start the engine.2)Read the data of throttle position sensor sig-nal using Subaru Select Monitor or OBD-II general scan tool.


Is the voltage more than 4.9 V? Go to step 2. Even if malfunction indicator light lights up, the cir-cuit has returned to a normal condi-tion at this time. A temporary poor contact of the con-nector may be the cause.

NOTE:In this case, repairthe following:• Poor contact in throttle position sensor connector• Poor contact in ECM connector• Poor contact in coupling connector

2 CHECK HARNESS BETWEEN THROTTLE POSITION SENSOR AND ECM CONNEC-TOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from throttle posi-tion sensor.3)Measure the resistance of harness between throttle position sensor connector and engine ground.




NOTE:In this case, repairthe following:• Open circuit in harness between throttle position sensor and ECM connector• Poor contact in coupling connector• Poor contact in joint connector

3 CHECK HARNESS BETWEEN THROTTLE POSITION SENSOR AND ECM CONNEC-TOR.1)Turn the ignition switch to ON.2)Measure the voltage between throttle posi-tion sensor connector and engine ground.


Is the voltage more than 4.9 V? Repair battery short circuit in har-ness between throttle position sensor and ECM connector. After repair, replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>


EN(H4SO)(diag)-120


R: DTC P0125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL


• TROUBLE SYMPTOM:• Engine would not return to idling.


EN-01426

1

*

B83

19

12

913

B135 ECM

21

E2

B21

E8

ENGINECOOLANT

TEMPERATURESENSOR

B21

1 2 3 45 6 7 8

9 10 11 1213 14 15 16

17 18 19 20

E8

1 23

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 3RHD : 2

EN(H4SO)(diag)-121


S: DTC P0129 ATMOSPHERIC PRESSURE SENSOR CIRCUIT RANGE/PER-FORMANCE


CAUTION:After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-40, OPERATION, Inspection Mode.>.

Step Check Yes No1 CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check DTC using



Go to step 2.

2 CHECK THERMOSTAT. Does the thermostat remain opened?

Replace the ther-mostat. <Ref. to CO(H4SO)-18, Thermostat.>




NOTE:It is not necessaryto inspect DTCP0129.

Replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

EN(H4SO)(diag)-122


T: DTC P0130 O2 SENSOR CIRCUIT (BANK 1 SENSOR 1)• DTC DETECTING CONDITION:





Go to step 2.

EN-01421

B18

3 41 2

5 6

B47 F44

1 2 3 45 6 7 8

B136 B135

1234

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

SBF-5

EE

B47

B18

64

53

21

43 12

B2

3C

13

C2

2

C6

C1

7

C1

6C

58

B:

C:

B135

B136

B22

E3

ECM

BATTERY

B61 F44

2


MAIN RELAY

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHDLHD

RH

D

RH

D

EN(H4SO)(diag)-123


2 CHECK FRONT OXYGEN (A/F) SENSOR DA-TA.1)Start the engine.2)While observing the Subaru Select Monitor or OBD-II general scan tool screen, warm-up the engine until coolant temperature is above 70°C (160°F).If the engine is already warmed-up, operate at idle speed for at least 1 minute.3)Read the data of front oxygen (A/F) sensor signal using Subaru Select Monitor or OBD-II general scan tool.


Is the voltage 0.85 — 1.15 V? Go to step 3. Go to step 4.

3 CHECK FRONT OXYGEN (A/F) SENSOR DA-TA.1)Race the engine at speeds from idling to 5,000 rpm for a total of 5 cycles.2)Read the data of front oxygen (A/F) sensor signal during racing using Subaru Select Moni-tor or OBD-II general scan tool.

NOTE:•Air fuel ratio is rich at normal condition or dur-ing racing.•To increase engine speed to 5,000 rpm, slowly depress accelerator pedal, taking approximately 5 seconds, and quickly release accelerator pedal to decrease engine speed.


4 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from ECM and front oxygen (A/F) sensor connector.3)Measure the resistance between ECM and front oxygen (A/F) sensor.

Connector & terminals(B136) No. 13 — (B18) No. 1:(B136) No. 22 — (B18) No. 2:


Go to step 5. Repair open circuit between ECM and front oxygen (A/F) sensor.

5 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR.Measure the resistance between ECM and chassis ground.

Connector & terminals(B136) No. 13 — Chassis ground:(B136) No. 22 — Chassis ground:


Go to step 6. Repair ground short circuit between ECM and front oxygen (A/F) sensor.

Step Check Yes No

EN(H4SO)(diag)-124


6 CHECK EXHAUST SYSTEM.Check exhaust system parts.

NOTE:Check the following items.•Loose installation of portions•Damage (crack, hole etc.) of parts•Looseness of front oxygen (A/F) sensor•Looseness and ill fitting of parts between front oxygen (A/F) sensor and rear oxygen sensor

Is there a fault in exhaust sys-tem?

Repair or replace faulty parts.


Step Check Yes No

EN(H4SO)(diag)-125


U: DTC P0131 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 1)• DTC DETECTING CONDITION:



EN-01421

B18

3 41 2

5 6

B47 F44

1 2 3 45 6 7 8

B136 B135

1234

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

SBF-5

EE

B47

B18

64

53

21

43 12

B2

3C

13

C2

2

C6

C1

7

C1

6C

58

B:

C:

B135

B136

B22

E3

ECM

BATTERY

B61 F44

2


MAIN RELAY

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHDLHD

RH

D

RH

D

EN(H4SO)(diag)-126



FRONT OXYGEN (A/F) SENSOR CONNEC-TOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from ECM and front oxygen (A/F) sensor connector.3)Measure the resistance of harness between ECM and front oxygen (A/F) sensor connector.




Repair ground short circuit in har-ness between ECM and front oxygen (A/F) sen-sor connector.

EN(H4SO)(diag)-127


V: DTC P0132 O2 SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 1)• DTC DETECTING CONDITION:



EN-01421

B18

3 41 2

5 6

B47 F44

1 2 3 45 6 7 8

B136 B135

1234

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

SBF-5

EE

B47

B18

64

53

21

43 12

B2

3C

13

C2

2

C6

C1

7

C1

6C

58

B:

C:

B135

B136

B22

E3

ECM

BATTERY

B61 F44

2


MAIN RELAY

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHDLHD

RH

D

RH

D

EN(H4SO)(diag)-128



FRONT OXYGEN (A/F) SENSOR CONNEC-TOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from front oxygen (A/F) sensor.3)Measure the voltage of harness between ECM connector and chassis ground.


Is the voltage more than 8 V? Replace the front oxygen (A/F) sen-sor. <Ref. to FU(H4SO)-43, Front Oxygen (A/F) Sensor.>

Repair battery short circuit in har-ness between ECM and front oxygen (A/F) sen-sor connector.

EN(H4SO)(diag)-129


W: DTC P0133 O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1)• DTC DETECTING CONDITION:



EN-01421

B18

3 41 2

5 6

B47 F44

1 2 3 45 6 7 8

B136 B135

1234

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

SBF-5

EE

B47

B18

64

53

21

43 12

B2

3C

13

C2

2

C6

C1

7

C1

6C

58

B:

C:

B135

B136

B22

E3

ECM

BATTERY

B61 F44

2


MAIN RELAY

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHDLHD

RH

D

RH

D

EN(H4SO)(diag)-130





Go to step 2.

2 CHECK EXHAUST SYSTEM.

NOTE:Check the following items.•Loose installation of front portion of exhaust pipe onto cylinder heads•Loose connection between front exhaust pipe and front catalytic converter•Damage of exhaust pipe resulting in a hole


Repair exhaust system.


EN(H4SO)(diag)-131


X: DTC P0134 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SEN-SOR 1)



EN-01421

B18

3 41 2

5 6

B47 F44

1 2 3 45 6 7 8

B136 B135

1234

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

SBF-5

EE

B47

B18

64

53

21

43 12

B2

3C

13

C2

2

C6

C1

7

C1

6C

58

B:

C:

B135

B136

B22

E3

ECM

BATTERY

B61 F44

2


MAIN RELAY

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHDLHD

RH

D

RH

D

EN(H4SO)(diag)-132



FRONT OXYGEN (A/F) SENSOR CONNEC-TOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from ECM and front oxygen (A/F) sensor connector.3)Measure the resistance of harness between ECM and front oxygen (A/F) sensor connector.




NOTE:In this case, repairthe following:• Open circuit in harness between ECM and front oxygen (A/F) sen-sor connector• Poor contact in front oxygen (A/F) sensor connector• Poor contact in ECM connector

2 CHECK POOR CONTACT.Check poor contact in front oxygen (A/F) sen-sor connector.

Is there poor contact in front oxygen (A/F) sensor connec-tor?

Repair poor con-tact in front oxygen (A/F) sensor con-nector.


EN(H4SO)(diag)-133


Y: DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)• DTC DETECTING CONDITION:



EN-01422

BATTERYB61 F44

2

B47

MAIN RELAY

12

35

46

F44

1 2 3 45 6 7 8

C4

B1

4

B1

9D

15

C1

6C

5

REAR OXYGEN SENSOR

ECM

1 4 3

2

8

B22

B83

B19

E3

B47

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

3 45 6

1 2

1

B135B:

D: B137

SBF-5

C: B136

B137

415

326

1815 167 8 9 10 11

17 19 2012 13

14

B135

5 6 78

29

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

*

EE

1

B19

1234

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 5RHD : 4

LHD

RH

D

LHD

RH

D

EN(H4SO)(diag)-134





Go to step 2.

2 CHECK REAR OXYGEN SENSOR DATA.1)Warm-up the engine until engine coolant temperature is above 70°C (158°F), and keep the engine speed at 5,000 rpm for two minutes.2)Read the data of rear oxygen sensor signal using Subaru Select Monitor or OBD-II general scan tool.

NOTE:•Subaru Select MonitorFor detailed operation procedure, refer to the “READ CURRENT DATA SHOWN ON DIS-PLAY FOR ENGINE”. <Ref. to EN(H4SO)(diag)-32, Subaru Select Monitor.>•OBD-II general scan toolFor detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.

Is the voltage 490 mV? Go to step 5. Go to step 3.

3 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from ECM and rear oxygen sensor.3)Measure the resistance of harness between ECM and rear oxygen sensor connector.


Is the resistance more than 3 Ω?

Repair open circuit in harness between ECM and rear oxygen sen-sor connector.

Go to step 4.

4 CHECK HARNESS BETWEEN REAR OXY-GEN SENSOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from rear oxygen sensor.3)Turn the ignition switch to ON.4)Measure the voltage between rear oxygen sensor harness connector and engine ground or chassis ground.


Is the voltage 0.2 — 0.5 V? Replace the rear oxygen sensor. <Ref. to FU(H4SO)-43, Front Oxygen (A/F) Sensor.>


NOTE:In this case, repairthe following:• Open circuit in harness between rear oxygen sen-sor and ECM con-nector• Poor contact in rear oxygen sen-sor connector• Poor contact in ECM connector

EN(H4SO)(diag)-135



NOTE:Check the following items.•Loose installation of portions•Damage (crack, hole etc.) of parts•Looseness and ill fitting of parts between front oxygen (A/F) sensor and rear oxygen sensor



Replace the rear oxygen sensor. <Ref. to FU(H4SO)-43, Front Oxygen (A/F) Sensor.>

Step Check Yes No

EN(H4SO)(diag)-136


Z: DTC P0138 O2 SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2)• DTC DETECTING CONDITION:



EN-01422

BATTERYB61 F44

2

B47

MAIN RELAY

12

35

46

F44

1 2 3 45 6 7 8

C4

B1

4

B1

9D

15

C1

6C

5

REAR OXYGEN SENSOR

ECM

1 4 3

2

8

B22

B83

B19

E3

B47

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

3 45 6

1 2

1

B135B:

D: B137

SBF-5

C: B136

B137

415

326

1815 167 8 9 10 11

17 19 2012 13

14

B135

5 6 78

29

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

*

EE

1

B19

1234

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 5RHD : 4

LHD

RH

D

LHD

RH

D

EN(H4SO)(diag)-137





Go to step 2.

2 CHECK REAR OXYGEN SENSOR DATA.1)Warm-up the engine until engine coolant temperature is above 70°C (158°F), and imme-diately decrease the engine speed from 5,000 rpm.2)Read the data of rear oxygen sensor signal using Subaru Select Monitor or OBD-II general scan tool.

NOTE:•Subaru Select MonitorFor detailed operation procedure, refer to the “READ CURRENT DATA SHOWN ON DIS-PLAY FOR ENGINE”. <Ref. to EN(H4SO)(diag)-32, Subaru Select Monitor.>•OBD-II general scan toolFor detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.

Is the voltage 250 mV? Go to step 5. Go to step 3.

3 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from ECM and rear oxygen sensor.3)Measure the resistance of harness between ECM and rear oxygen sensor connector.


Is the resistance more than 3 Ω?

Repair open circuit in harness between ECM and rear oxygen sen-sor connector.

Go to step 4.

4 CHECK HARNESS BETWEEN REAR OXY-GEN SENSOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from rear oxygen sensor.3)Turn the ignition switch to ON.4)Measure the voltage between rear oxygen sensor harness connector and engine ground or chassis ground.


Is the voltage 0.2 — 0.5 V? Replace the rear oxygen sensor. <Ref. to FU(H4SO)-43, Front Oxygen (A/F) Sensor.>


NOTE:In this case, repairthe following:• Open circuit in harness between rear oxygen sen-sor and ECM con-nector• Poor contact in rear oxygen sen-sor connector• Poor contact in ECM connector

EN(H4SO)(diag)-138



NOTE:Check the following items.•Loose installation of portions•Damage (crack, hole etc.) of parts•Looseness and ill fitting of parts between front oxygen (A/F) sensor and rear oxygen sensor




Step Check Yes No

EN(H4SO)(diag)-139


AA:DTC P0139 O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 2)• DTC DETECTING CONDITION:



EN-01422

BATTERYB61 F44

2

B47

MAIN RELAY

12

35

46

F44

1 2 3 45 6 7 8

C4

B1

4

B1

9D

15

C1

6C

5

REAR OXYGEN SENSOR

ECM

1 4 3

2

8

B22

B83

B19

E3

B47

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

3 45 6

1 2

1

B135B:

D: B137

SBF-5

C: B136

B137

415

326

1815 167 8 9 10 11

17 19 2012 13

14

B135

5 6 78

29

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

*

EE

1

B19

1234

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

*LHD : 5RHD : 4

LHD

RH

D

LHD

RH

D

EN(H4SO)(diag)-140


AB:DTC P0171 SYSTEM TOO LEAN (BANK 1)Refer to DTC P0172 for diagnostic procedure. <Ref. to EN(H4SO)(diag)-142, DTC P0172 SYSTEM TOORICH (BANK 1), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>





EN(H4SO)(diag)-141


AC:DTC P0172 SYSTEM TOO RICH (BANK 1)• DTC DETECTING CONDITION:


• Erroneous idling• Engine stalls.• Poor driving performance


Step Check Yes No1 CHECK EXHAUST SYSTEM. Are there holes or loose bolts

on exhaust system?Repair exhaust system.

Go to step 2.

2 CHECK EGR VALVE. Is the EGR valve stuck? Replace the EGR valve.

Go to step 3.

3 CHECK AIR INTAKE SYSTEM. Are there holes, loose bolts or disconnection of hose on air intake system?

Repair air intake system.

Go to step 4.

4 CHECK PURGE CONTROL SOLENOID VALVE.

Is the purge control solenoid valve stuck?

Replace the purge control solenoid valve.

Go to step 5.

5 CHECK PCV VALVE. Is PCV valve operated? Go to step 6. Replace the PCV valve.

6 CHECK FUEL PRESSURE.

Warning:•Place “NO FIRE” signs near the working area.•Be careful not to spill fuel on the floor.1)Release fuel pressure.

(1) Disconnect the connector from fuel pump relay.(2) Start the engine and run it until it stalls.(3) After the engine stalls, crank it for five more seconds.(4) Turn the ignition switch to OFF.

2)Connect the connector to fuel pump relay.3)Disconnect the fuel delivery hose from fuel filter, and connect fuel pressure gauge.4)Install the fuel filler cap.5)Start the engine and idle while gear position is neutral.6)Measure the fuel pressure while disconnect-ing pressure regulator vacuum hose from intake manifold.

Warning:Before removing the fuel pressure gauge,release fuel pressure.

NOTE:If fuel pressure does not increase, squeeze fuelreturn hose 2 to 3 times, then measure fuelpressure again.

Is the fuel pressure 284 — 314

kPa (2.9 — 3.2 kg/cm2, 41 — 46 psi)?

Go to step 7. Repair the follow-ing items.Fuel pressure too high

• Clogged fuel return line or bent hose

Fuel pressure too low

• Improper fuel pump discharge• Clogged fuel supply line

EN(H4SO)(diag)-142


7 CHECK FUEL PRESSURE.After connecting the pressure regulator vac-uum hose, measure fuel pressure.

Warning:Before removing the fuel pressure gauge,release fuel pressure.

NOTE:•If fuel pressure does not increase, squeeze fuel return hose 2 to 3 times, then measure fuel pressure again.•If out of specification as measured at this step, check or replace pressure regulator and pres-sure regulator vacuum hose.

Is the fuel pressure 206 — 235

kPa (2.1 — 2.4 kg/cm2, 30 — 34 psi)?

Go to step 8. Repair the follow-ing items.Fuel pressure too high

• Faulty pres-sure regulator• Clogged fuel return line or bent hose

Fuel pressure too low

• Faulty pres-sure regulator• Improper fuel pump discharge• Clogged fuel supply line

8 CHECK ENGINE COOLANT TEMPERATURE SENSOR.1)Start the engine and warm-up completely.2)Read the data of engine coolant temperature sensor signal using Subaru Select Monitor or OBD-II general scan tool.


Is the engine coolant tempera-ture 70 — 100°C (158 — 212°F)?

Go to step 9. Replace the engine coolant temperature sen-sor. <Ref. to FU(H4SO)-27, Engine Coolant Temperature Sen-sor.>

9 CHECK PRESSURE SENSOR SIGNAL.1)Start the engine and warm-up engine until coolant temperature is greater than 60°C (140°F).2)Place the select lever in “N” or “P” range.3)Turn the A/C switch to OFF.4)Turn all accessory switches to OFF.5)Read the data of pressure sensor signal using Subaru Select Monitor or OBD-II general scan tool.


Idling: Is the measured value 24.0 — 41.3 kPa (180 — 310 mmHg, 7.09 — 12.20 inHg)?, Ignition ON: Is the measured value 73.3 — 106.6 kPa (550 — 800 mmHg, 21.65 — 31.50 inHg)?



Replace the Pres-sure sensor. <Ref. to FU(H4SO)-33, Manifold Absolute Pressure Sensor.>

Step Check Yes No

EN(H4SO)(diag)-143


AD:DTC P0301 CYLINDER 1 MISFIRE DETECTEDNOTE:For the diagnostic procedure, refer to DTC P0304. <Ref. to EN(H4SO)(diag)-145, DTC P0304 CYLINDER 4MISFIRE DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

AE:DTC P0302 CYLINDER 2 MISFIRE DETECTEDNOTE:For the diagnostic procedure, refer to DTC P0304. <Ref. to EN(H4SO)(diag)-145, DTC P0304 CYLINDER 4MISFIRE DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

AF:DTC P0303 CYLINDER 3 MISFIRE DETECTEDNOTE:For the diagnostic procedure, refer to DTC P0304. <Ref. to EN(H4SO)(diag)-145, DTC P0304 CYLINDER 4MISFIRE DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

EN(H4SO)(diag)-144


AG:DTC P0304 CYLINDER 4 MISFIRE DETECTED• DTC DETECTING CONDITION:

• Two consecutive driving cycles with fault• Immediately at fault recognition (A misfire which could damage catalyst occurs.)

• TROUBLE SYMPTOM:• Engine stalls.• Erroneous idling• Rough driving


EN-01428

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

E6 E17

E5 E16

1 2

12 12 12 12

22

23

34 8

91 10

11

12ECMB134

E5 E16 E6 E17

B22

E3

FUEL INJECTORNo. 1

FUEL INJECTORNo. 2

FUEL INJECTORNo. 3

FUEL INJECTORNo. 4

BATTERY

SBF-5

B47

MAIN RELAY

12

35

46

B47

3 41 2

5 6

F44

1 2 3 45 6 7 8

B134

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

B61 F44

2 LHD

RH

D

LHD

RH

D

E

EN(H4SO)(diag)-145




NOTE:In this case, it is not necessary to inspect DTC P0301, P0302, P0303 and P0304.

Go to step 2.

2 CHECK OUTPUT SIGNAL FROM ECM.1)Turn the ignition switch to ON.2)Measure the voltage between ECM connec-tor and chassis ground on faulty cylinders.

Connector & terminal#1 (B134) No. 34 (+) — Chassis ground (−−−−):#2 (B134) No. 23 (+) — Chassis ground (−−−−):#3 (B134) No. 22 (+) — Chassis ground (−−−−):#4 (B134) No. 8 (+) — Chassis ground (−−−−):


3 CHECK HARNESS BETWEEN FUEL INJEC-TOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from fuel injector on faulty cylinders.3)Measure the resistance between ECM con-nector and engine ground on faulty cylinders.

Connector & terminal#1 (E5) No. 1 — Engine ground:#2 (E16) No. 1 — Engine ground:#3 (E6) No. 1 — Engine ground:#4 (E17) No. 1 — Engine ground:


Go to step 4. Repair ground short circuit in har-ness between fuel injector and ECM connector.

4 CHECK HARNESS BETWEEN FUEL INJEC-TOR AND ECM CONNECTOR.Measure the resistance of harness connector between ECM connector and fuel injector on faulty cylinders.

Connector & terminal#1 (B134) No. 34 — (E5) No. 1:#2 (B134) No. 23 — (E16) No. 1:#3 (B134) No. 22 — (E6) No. 1:#4 (B134) No. 8 — (E17) No. 1:



NOTE:In this case, repairthe following:• Open circuit in harness between ECM and fuel injector connector• Poor contact in coupling connector

5 CHECK FUEL INJECTOR.Measure the resistance between fuel injector terminals on faulty cylinder.


Is the resistance 5 Ω — 20 Ω? Go to step 6. Replace the faulty fuel injector. <Ref. to FU(H4SO)-38, Fuel Injector.>

EN(H4SO)(diag)-146


6 CHECK POWER SUPPLY LINE.1)Turn the ignition switch to ON.2)Measure the voltage between fuel injector and engine ground on faulty cylinders.

Connector & terminal#1 (E5) No. 2 (+) — Engine ground (−−−−):#2 (E16) No. 2 (+) — Engine ground (−−−−):#3 (E6) No. 2 (+) — Engine ground (−−−−):#4 (E17) No. 2 (+) — Engine ground (−−−−):

Is the voltage more than 10 V? Repair poor con-tact in all connec-tors in fuel injector circuit.


NOTE:In this case, repairthe following:• Open circuit in harness between main relay and fuel injector connector on faulty cylinders• Poor contact in coupling connector• Poor contact in main relay connec-tor• Poor contact in fuel injector con-nector on faulty cylinders

7 CHECK HARNESS BETWEEN FUEL INJEC-TOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from fuel injector on faulty cylinder.3)Turn the ignition switch to ON.4)Measure the voltage between ECM connec-tor and chassis ground on faulty cylinders.

Connector & terminal#1 (B134) No. 34 (+) — Chassis ground (−−−−):#2 (B134) No. 23 (+) — Chassis ground (−−−−):#3 (B134) No. 22 (+) — Chassis ground (−−−−):#4 (B134) No. 8 (+) — Chassis ground (−−−−):

Is the voltage more than 10 V? Repair battery short circuit in har-ness between ECM and fuel injector. After repair, replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

Go to step 8.

8 CHECK FUEL INJECTOR.1)Turn the ignition switch to OFF.2)Measure the resistance between fuel injector terminals on faulty cylinder.



Replace the faulty fuel injector <Ref. to FU(H4SO)-38, Fuel Injector.> and ECM <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

Go to step 9.

9 CHECK INSTALLATION OF CAMSHAFT PO-SITION SENSOR/CRANKSHAFT POSITION SENSOR.

Is the camshaft position sensor or crankshaft position sensor loosely installed?

Tighten camshaft position sensor or crankshaft posi-tion sensor.

Go to step 10.

10 CHECK CRANKSHAFT SPROCKET.Remove the timing belt cover.

Is the crankshaft sprocket rusted or does it have broken teeth?

Replace the crank-shaft sprocket. <Ref. to ME(H4SO)-55, Crankshaft Sprocket.>

Go to step 11.

11 CHECK INSTALLATION CONDITION OF TIMING BELT.Turn the crankshaft using ST, and align align-ment mark on crankshaft sprocket with align-ment mark on cylinder block.ST 499987500 CRANKSHAFT SOCKET

Is the timing belt dislocated from its proper position?

Repair installation condition of timing belt. <Ref. to ME(H4SO)-48, Timing Belt Assembly.>

Go to step 12.

Step Check Yes No

EN(H4SO)(diag)-147


12 CHECK FUEL LEVEL. Is the fuel meter indication higher than the “Lower” level?

Go to step 13. Replenish fuel so fuel meter indica-tion is higher than the “Lower” level. After replenishing fuel, Go to step 13.

13 CHECK STATUS OF MALFUNCTION INDI-CATOR LIGHT.1)Clear the memory using Subaru Select Mon-itor.<Ref. to EN(H4SO)(diag)-47, Clear Memory Mode.>2)Start the engine, and drive the vehicle more than 10 minutes.

Does the malfunction indicator light illuminate or blink?


14 CHECK CAUSE OF MISFIRE DIAGNOSED. Was the cause of misfire iden-tified when the engine is run-ning.Ex. Disconnection of spark plug cord.

Finish diagnostics operation, if the engine has no abnormality.

1. Repair poor contact.

NOTE:In this case, repairthe following:• Poor contact in ignitor connector• Poor contact in ignition coil con-nector• Poor contact in fuel injector con-nector on faulty cylinders• Poor contact in ECM connector• Poor contact in coupling connector

2. If there is no poor contact, check the follow-ings and contact with your Subaru distributor service.

• Fuel condi-tion• Whether addition agent is used or not• Plug condi-tion• Plug cord condition• Engine oil condition

Step Check Yes No

EN(H4SO)(diag)-148


15 CHECK AIR INTAKE SYSTEM. Is there a fault in air intake sys-tem?

Repair air intake system.

NOTE:Check the follow-ing items:• Are there air leaks or air suction caused by loose or dislocated nuts and bolts?• Are there cracks or any disconnec-tion of hoses?

Go to step 16.

16 CHECK MISFIRE SYMPTOM.1)Turn the ignition switch to ON.2)Read the DTC.•Subaru Select Monitor<Ref. to EN(H4SO)(diag)-32, Subaru Select Monitor.>•OBD-II general scan toolFor detailed operation procedures, refer to the OBD-II General Scan Tool Operation Manual.

NOTE:Perform diagnosis according to the items listedbelow.

Does the Subaru Select Moni-tor or OBD-II general scan tool display only one DTC?


17 CHECK DIAGNOSTIC TROUBLE CODE (DTC) ON DISPLAY.

Does the Subaru Select Moni-tor or OBD-II general scan tool indicate DTC P0301 and P0302?











21 ONLY ONE CYLINDER Is there a fault in that cylinder? Repair or replace faulty parts.

NOTE:Check the follow-ing items.• Spark plug• Spark plug cord• Fuel injector• Compression ratio

Go to DTC P0171. <Ref. to EN(H4SO)(diag)-141, DTC P0171 SYSTEM TOO LEAN (BANK 1), Diagnostic Proce-dure with Diagnos-tic Trouble Code (DTC).>

Step Check Yes No

EN(H4SO)(diag)-149


22 GROUP OF #1 AND #2 CYLINDERS Are there faults in #1 and #2 cylinders?


NOTE:• Check the fol-lowing items.

• Spark plugs• Fuel injectors• Ignition coil• Compres-sion ratio

• If no abnormal is discovered, check for “IGNITION CONTROL SYS-TEM” of #1 and #2 cylinders side. <Ref. to EN(H4SO)(diag)-66, IGNITION CONTROL SYS-TEM, Diagnostics for Engine Start-ing Failure.>




NOTE:• Check the fol-lowing items.

• Spark plugs• Fuel injectors• Ignition coil

• If no abnormal is discovered, check for “16. D: IGNI-TION CONTROL SYSTEM” of #3 and #4 cylinders side. <Ref. to EN(H4SO)(diag)-66, IGNITION CONTROL SYS-TEM, Diagnostics for Engine Start-ing Failure.>




NOTE:Check the follow-ing items.• Spark plugs• Fuel injectors• Skipping timing belt teeth


Step Check Yes No

EN(H4SO)(diag)-150




NOTE:Check the follow-ing items.• Spark plugs• Fuel injectors• Compression ratio• Skipping timing belt teeth


26 CYLINDER AT RANDOM Is the engine idle rough? Go to DTC P0170. <Ref. to EN(H4SO)(diag)-141, DTC P0171 SYSTEM TOO LEAN (BANK 1), Diagnostic Proce-dure with Diagnos-tic Trouble Code (DTC).>


NOTE:Check the follow-ing items.• Spark plugs• Fuel injectors• Compression ratio

Step Check Yes No

EN(H4SO)(diag)-151


AH:DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW INPUT (BANK 1 OR SINGLE SENSOR)


• TROUBLE SYMPTOM:• Poor driving performance• Knocking occurs.


EN-01429

16

27

KNOCKSENSOR

16

2

ECMB135

B21

E2

E14

E14

1 2

B21

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

E

EN(H4SO)(diag)-152


Step Check Yes No1 CHECK HARNESS BETWEEN KNOCK SEN-

SOR AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from ECM.3)Measure the resistance between ECM har-ness connector and chassis ground.

Connector & terminal(B135) No. 16 — Chassis ground:

Is the resistance more than 700 kΩ?


NOTE:In this case, repairthe following:• Open circuit in harness between knock sensor and ECM connector• Poor contact in knock sensor con-nector• Poor contact in coupling connector

2 CHECK KNOCK SENSOR.1)Disconnect the connector from knock sensor.2)Measure the resistance between knock sen-sor connector terminal and engine ground.

TerminalNo. 2 — Engine ground:



NOTE:In this case, repairthe following:• Open circuit in harness between knock sensor and ECM connector• Poor contact in knock sensor con-nector• Poor contact in coupling connector

3 CHECK CONDITION OF KNOCK SENSOR INSTALLATION.

Is the knock sensor installation bolt tightened securely?

Replace the knock sensor. <Ref. to FU(H4SO)-30, Knock Sensor.>

Tighten knock sen-sor installation bolt securely.

EN(H4SO)(diag)-153


AI: DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH INPUT (BANK 1 OR SINGLE SENSOR)


• TROUBLE SYMPTOM:• Poor driving performance• Knocking occurs.


EN-01429

16

27

KNOCKSENSOR

16

2

ECMB135

B21

E2

E14

E14

1 2

B21

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

E

EN(H4SO)(diag)-154


Step Check Yes No1 CHECK HARNESS BETWEEN KNOCK SEN-

SOR AND ECM CONNECTOR.Measure the resistance of harness between ECM connector and chassis ground.


Is the resistance less than 400 kΩ?


2 CHECK KNOCK SENSOR.1)Disconnect the connector from knock sensor.2)Measure the resistance between knock sen-sor connector terminal and engine ground.

TerminalNo. 2 — Engine ground:

Is the resistance less than 400 kΩ?

Replace the knock sensor. <Ref. to FU(H4SO)-30, Knock Sensor.>

Repair ground short circuit in har-ness between knock sensor con-nector and ECM connector.

NOTE:The harness be-tween both con-nectors is shielded.Repair short circuitof harness togetherwith shield.

3 CHECK INPUT SIGNAL FOR ECM.1)Connect the connectors to ECM and knock sensor.2)Turn the ignition switch to ON.3)Measure the voltage between ECM and chassis ground.


Is the voltage more than 2 V? Even if malfunction indicator light lights up, the cir-cuit has returned to a normal condi-tion at this time. (However, the pos-sibility of poor con-tact still remains.)

NOTE:In this case, repairthe following:• Poor contact in knock sensor con-nector• Poor contact in ECM connector• Poor contact in coupling connector


EN(H4SO)(diag)-155


AJ:DTC P0335 CRANKSHAFT POSITION SENSOR “A” CIRCUIT• DTC DETECTING CONDITION:


• Engine stalls.• Failure of engine to start


EN-01430

121

72

8

B21

E2

E10

B21

E10

1 2

B135 ECM

CRANKSHAFTPOSITIONSENSOR

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

LHD : 19RHD : 20

1

LHD : 17RHD : 18

RHD : 6

LHD WITH IMMOBILIZER : 6

LHD WITHOUT IMMOBILIZER : 7

2

3

E

EN(H4SO)(diag)-156


Step Check Yes No1 CHECK HARNESS BETWEEN CRANK-

SHAFT POSITION SENSOR AND ECM CON-NECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from crankshaft position sensor.3)Measure the resistance of harness between crankshaft position sensor connector and engine ground.




NOTE:In this case, repairthe following:• Open circuit in harness between crankshaft posi-tion sensor and ECM connector• Poor contact in ECM connector• Poor contact in coupling connector

Go to step 2.

2 CHECK HARNESS BETWEEN CRANK-SHAFT POSITION SENSOR AND ECM CON-NECTOR.Measure the resistance of harness between crankshaft position sensor connector and engine ground.



Repair ground short circuit in har-ness between crankshaft posi-tion sensor and ECM connector.

NOTE:The harness be-tween both connec-tors are shielded.Repair ground shortcircuit in harness to-gether with shield.

Go to step 3.

3 CHECK HARNESS BETWEEN CRANK-SHAFT POSITION SENSOR AND ECM CON-NECTOR.Measure the resistance of harness between crankshaft position sensor connector and engine ground.




NOTE:In this case, repairthe following:• Open circuit in harness between crankshaft posi-tion sensor and ECM connector• Poor contact in ECM connector• Poor contact in coupling connector

4 CHECK CONDITION OF CRANKSHAFT PO-SITION SENSOR.

Is the crankshaft position sen-sor installation bolt tightened securely?

Go to step 5. Tighten crank-shaft position sen-sor installation bolt securely.

5 CHECK CRANKSHAFT POSITION SENSOR.1)Remove the crankshaft position sensor.2)Measure the resistance between connector terminals of crankshaft position sensor.


Is the resistance 1 — 4 kΩ? Repair poor con-tact in crankshaft position sensor connector.

Replace the crank-shaft position sen-sor. <Ref. to FU(H4SO)-28, Crankshaft Posi-tion Sensor.>

EN(H4SO)(diag)-157


AK:DTC P0336 CRANKSHAFT POSITION SENSOR “A” CIRCUIT RANGE/PER-FORMANCE


• TROUBLE SYMPTOM:• Engine stalls.• Failure of engine to start


EN-01430

121

72

8

B21

E2

E10

B21

E10

1 2

B135 ECM

CRANKSHAFTPOSITIONSENSOR

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

LHD : 19RHD : 20

1

LHD : 17RHD : 18

RHD : 6


LHD WITHOUT IMMOBILIZER : 7

2

3

E

EN(H4SO)(diag)-158




Go to step 2.

2 CHECK CONDITION OF CRANKSHAFT PO-SITION SENSOR.Turn the ignition switch to OFF.

Is the crankshaft position sen-sor installation bolt tightened securely?

Go to step 3. Tighten crank-shaft position sen-sor installation bolt securely.

3 CHECK CRANKSHAFT SPROCKET.Remove the front belt cover.

Are crankshaft sprocket teeth cracked or damaged?

Replace the crank-shaft sprocket. <Ref. to ME(H4SO)-55, Crankshaft Sprocket.>

Go to step 4.

4 CHECK INSTALLATION CONDITION OF TIMING BELT.Turn the crankshaft using ST, and align align-ment mark on crankshaft sprocket with align-ment mark on cylinder block.ST 499987500 CRANKSHAFT SOCKET



Replace the crank-shaft position sen-sor. <Ref. to FU(H4SO)-28, Crankshaft Posi-tion Sensor.>

EN(H4SO)(diag)-159


AL:DTC P0340 CAMSHAFT POSITION SENSOR “A” CIRCUIT (BANK 1 OR SIN-GLE SENSOR)




EN-01431

B21

E15

1 2

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

121

82

8

B21

E2

E15

B135 ECM

CAMSHAFTPOSITIONSENSOR

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

LHD : 20RHD : 19

LHD : 18RHD : 17

RHD : 7


RHD WITHOUT IMMOBILIZER : 6

1

2

3

E

EN(H4SO)(diag)-160


Step Check Yes No1 CHECK HARNESS BETWEEN CAMSHAFT

POSITION SENSOR AND ECM CONNEC-TOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from camshaft position sensor.3)Measure the resistance of harness between camshaft position sensor connector and engine ground.




NOTE:In this case, repairthe following:• Open circuit in harness between camshaft position sensor and ECM connector• Poor contact in ECM connector• Poor contact in coupling connector

Go to step 2.

2 CHECK HARNESS BETWEEN CAMSHAFT POSITION SENSOR AND ECM CONNEC-TOR.Measure the resistance of harness between camshaft position sensor connector and engine ground.



Repair ground short circuit in har-ness between camshaft position sensor and ECM connector.

NOTE:The harness be-tween both con-nectors areshielded. Repairground short circuitin harness togeth-er with shield.

Go to step 3.






4 CHECK CONDITION OF CAMSHAFT POSI-TION SENSOR.

Is the camshaft position sensor installation bolt tightened securely?

Go to step 5. Tighten camshaft position sensor installation bolt securely.

5 CHECK CAMSHAFT POSITION SENSOR.1)Remove the camshaft position sensor.2)Measure the resistance between connector terminals of camshaft position sensor.


Is the resistance 1 — 4 kΩ? Repair poor con-tact in camshaft position sensor connector.

Replace the cam-shaft position sen-sor. <Ref. to FU(H4SO)-29, Camshaft Position Sensor.>

EN(H4SO)(diag)-161


AM:DTC P0341 CAMSHAFT POSITION SENSOR “A” CIRCUIT RANGE/PERFOR-MANCE (BANK 1 OR SINGLE SENSOR)




EN-01431

B21

E15

1 2

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

121

82

8

B21

E2

E15

B135 ECM

CAMSHAFTPOSITIONSENSOR

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

LHD : 20RHD : 19

LHD : 18RHD : 17

RHD : 7


RHD WITHOUT IMMOBILIZER : 6

1

2

3

E

EN(H4SO)(diag)-162




Go to step 2.

2 CHECK HARNESS BETWEEN CAMSHAFT POSITION SENSOR AND ECM CONNEC-TOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from camshaft position sensor.3)Measure the resistance of harness between camshaft position sensor connector and engine ground.





Go to step 3.




Repair ground short circuit in har-ness between camshaft position sensor and ECM connector.

NOTE:The harness be-tween both con-nectors areshielded. Repairground short circuitin harness togeth-er with shield.

Go to step 4.






5 CHECK CONDITION OF CAMSHAFT POSI-TION SENSOR.



6 CHECK CAMSHAFT POSITION SENSOR.1)Remove the camshaft position sensor.2)Measure the resistance between connector terminals of camshaft position sensor.


Is the resistance 1 — 4 kΩ? Go to step 7. Replace the cam-shaft position sen-sor. <Ref. to FU(H4SO)-29, Camshaft Position Sensor.>

EN(H4SO)(diag)-163


7 CHECK CONDITION OF CAMSHAFT POSI-TION SENSOR.Turn the ignition switch to OFF.



8 CHECK CAMSHAFT SPROCKET.Remove the front belt cover. <Ref. to ME(H4SO)-47, Timing Belt Cover.>

Are camshaft sprocket teeth cracked or damaged?

Replace the cam-shaft sprocket. <Ref. to ME(H4SO)-53, Camshaft Sprocket.>

Go to step 9.

9 CHECK INSTALLATION CONDITION OF TIMING BELT.Turn the camshaft using ST, and align align-ment mark on camshaft sprocket with align-ment mark on timing belt cover LH.ST 499987500 CRANKSHAFT SOCKET



Replace the cam-shaft position sen-sor. <Ref. to FU(H4SO)-29, Camshaft Position Sensor.>

Step Check Yes No

EN(H4SO)(diag)-164


AN:DTC P0400 EXHAUST GAS RECIRCULATION FLOW• DTC DETECTING CONDITION:


• Poor driving performance on low engine speed• Erroneous idling• Poor driving performance.


EN-01432

B137

B135

B134

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

EE

B47

E18

251436

B22B61 F44

E3

B328

E58

B22

E3

64

53

21 1

5A

17

A1

6A

15

A1

8

B2

1D

14

A7

4 36

15

16

SBF-5

BATTERY

MAIN RELAY

EGRVALVE

C1

9

A: B134

B: B135

C: B136

D: B137

ECM

B47

F44

E18

3 41 2

5 6

1 34 5 6

2

2

1 2 3 45 6 7 8

415

326

1815 167 8 9 10 11

17 19 2012 13

14

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

B328

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHD

RH

D

RH

DLHD

MT

EN(H4SO)(diag)-165


Step Check Yes No1 CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect the rele-

vant DTC using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)-74, List of Diag-nostic Trouble Code (DTC).>

Go to step 2.

2 CHECK CURRENT DATA.1)Start engine.2)Rear the data of intake manifold absolute pressure signal using Subaru Select Monitor or OBD-II general scan tool.


Is the measured value more than 53.3 kPa (400 mmHg, 15.75 inHg)?

Check if EGR valve, intake mani-fold pressure sen-sor and throttle body are securely installed.

Go to step 3.

3 CHECK POWER SUPPLY TO EGR SOLE-NOID VALVE.1)Disconnect the connector from EGR sole-noid valve.2)Turn the ignition switch to ON.3)Measure the voltage between EGR solenoid valve and engine ground.

Connector & terminal(E18) No. 2 (+) — Engine ground (−−−−):(E18) No. 5 (+) — Engine ground (−−−−):

Is the voltage more than 10 V? Go to step 4. Repair the open circuit in harness between main relay and EGR solenoid valve connector.

4 CHECK EGR SOLENOID VALVE.Measure the resistance between EGR sole-noid valve terminals.

NOTE:Make sure there are no foreign objects caughtbetween EGR solenoid valve and valve seat.

TerminalsNo. 1 — No. 2:No. 3 — No. 2:No. 4 — No. 5:No. 6 — No. 5:

In the resistance 20 — 30 Ω? Go to step 5. Replace the EGR solenoid valve. <Ref. to EC(H4SO)-5, EGR Valve.>

5 CHECK OUTPUT SIGNAL FROM ECM.1)Turn the ignition switch to OFF.2)Connect the connectors to ECM and EGR solenoid valve.3)Turn the ignition switch to ON.4)Measure the voltage between ECM and chassis ground.

Connector & terminal(B134) No. 15 (+) — Chassis ground (−−−−):(B134) No. 16 (+) — Chassis ground (−−−−):(B134) No. 17 (+) — Chassis ground (−−−−):(B134) No. 18 (+) — Chassis ground (−−−−):

Is the voltage 0 — 10 V? Repair the poor contact in ECM connector.

Go to step 6.

EN(H4SO)(diag)-166


6 CHECK HARNESS BETWEEN EGR SOLE-NOID VALVE AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from EGR sole-noid valve and ECM.3)Measure the resistance of harness between EGR solenoid valve and ECM connector.

Connector & terminal(B134) No. 18 — (E18) No. 6:(B134) No. 17 — (E18) No. 1:(B134) No. 16 — (E18) No. 4:(B134) No. 15 — (E18) No. 3:


Go to step 7. Repair the open circuit in harness between ECM and EGR solenoid valve connector.

7 CHECK HARNESS BETWEEN EGR SOLE-NOID VALVE AND ECM CONNECTOR.Measure the resistance of harness between EGR solenoid valve and chassis ground.

Connector & terminal(B134) No. 15 — Chassis ground:(B134) No. 16 — Chassis ground:(B134) No. 17 — Chassis ground:(B134) No. 18 — Chassis ground:


Go to step 8. Repair the short circuit in harness between main relay and EGR solenoid valve connector.

8 CHECK POOR CONTACT.Check the poor contact in ECM and EGR sole-noid valve connector.

Is there poor contact in ECM and EGR solenoid valve con-nector?

Repair the poor contact in ECM and EGR solenoid valve connector.

Even if malfunction indicator light lights up, the cir-cuit has returned to a normal condi-tion at this time.

Step Check Yes No

EN(H4SO)(diag)-167


AO:DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)


• TROUBLE SYMPTOM:• Engine stalls.• Idle mixture is out of specifications.


EN-01433

B18

B19

3 41 2

5 6

B47 F44

1 2 3 45 6 7 8

B136

B137 B135

BATTERY

REAR OXYGEN SENSOR


MAIN RELAY

SBF-5

B47

B19

B18

12

35

64

E

B83

B1

9

C4

B1

4

D1

5

3 1 4

B2

3C

13

C2

2

C6

C1

7

1234

1

B135 ECMB136B : C : B137D :

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

415

326

1815 167 8 9 10 11

17 19 2012 13

14

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

2

B61 F44

2LHD

RH

D

RH

D

LHD

1 34 5 6

2

B83 : LHD

1 2 3 4

B83 : RHD

LHD : 5RHD : 4

1234

EN(H4SO)(diag)-168





Go to step 2.

2 CHECK EXHAUST SYSTEM.Check for gas leaks or air suction caused by loose or dislocated nuts and bolts, and open hole at exhaust pipes.

NOTE:Check the following positions.•Between cylinder head and front exhaust pipe•Between front exhaust pipe and front catalytic converter•Between front catalytic converter and rear cat-alytic converter


Repair or replace the exhaust sys-tem. <Ref. to EX(H4SO)-2, Gen-eral Description.>

Go to step 3.

3 CHECK CATALYTIC CONVERTER. Is there damage at rear face or front face of front catalyst?

Replace the cata-lytic converter. <Ref. to EC(H4SO)-3, Front Catalytic Converter.>

Go to step 4.

4 CHECK REAR OXYGEN SENSOR GROUND HARNESS.1)Disconnect the rear oxygen sensor and ECM connectors.2)Measure the resistance between rear oxy-gen sensor connector and ECM connector.



Go to step 5. Repair the open circuit in harness between ECM and rear oxygen sen-sor.

5 CHECK SHIELD HARNESS. Is the shield harness opened? Repair the shield harness.

Contact with your Subaru distributor service.

EN(H4SO)(diag)-169


AP:DTC P0458 EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CON-TROL VALVE CIRCUIT LOW


• TROUBLE SYMPTOM:• Erroneous idling


EN-01434

PURGE CONTROLSOLENOID VALVE

E4

B22

E3

B47

B47

3 41 2

5 6

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

SBF-5

BATTERY

MAIN RELAY

12

35

46

29

211 2

B134 ECM

F44

1 2 3 45 6 7 8

E4

1 2

B134

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

B61 F44

2LHD

RH

D

RH

DLHD

E

EN(H4SO)(diag)-170



1)Turn the ignition switch to ON.2)Measure the voltage between ECM and chassis ground.


Is the voltage more than 10 V? Even if malfunction indicator light lights up, the cir-cuit has returned to a normal condi-tion at this time. Contact with SUB-ARU distributor service.


Go to step 2.

2 CHECK HARNESS BETWEEN PURGE CON-TROL SOLENOID VALVE AND ECM CON-NECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from purge con-trol solenoid valve and ECM.3)Measure the resistance of harness between purge control solenoid valve connector and engine ground.



Go to step 3. Repair ground short circuit in har-ness between ECM and purge control solenoid valve connector.

3 CHECK HARNESS BETWEEN PURGE CON-TROL SOLENOID VALVE AND ECM CON-NECTOR.Measure the resistance of harness between ECM and purge control solenoid valve of har-ness connector.



Go to step 4. Repair open circuit in harness between ECM and purge control sole-noid valve connec-tor.

NOTE:In this case, repairthe following:• Open circuit in harness between ECM and purge control solenoid valve connector• Poor contact in coupling connector

4 CHECK PURGE CONTROL SOLENOID VALVE.1)Remove the purge control solenoid valve.2)Measure the resistance between purge con-trol solenoid valve terminals.


Is the resistance 10 — 100 Ω? Go to step 5. Replace the purge control solenoid valve. <Ref. to EC(H4SO)-7, Purge Control Solenoid Valve.>

5 CHECK POWER SUPPLY TO PURGE CON-TROL SOLENOID VALVE.1)Turn the ignition switch to ON.2)Measure the voltage between purge control solenoid valve and engine ground.


Is the voltage more than 10 V? Go to step 6. Repair open circuit in harness between main relay and purge control solenoid valve connector.

EN(H4SO)(diag)-171


6 CHECK POOR CONTACT.Check poor contact in purge control solenoid valve connector.

Is there poor contact in purge control solenoid valve connec-tor?

Repair poor con-tact in purge con-trol solenoid valve connector.



Step Check Yes No

EN(H4SO)(diag)-172


AQ:DTC P0459 EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CON-TROL VALVE CIRCUIT HIGH


• TROUBLE SYMPTOM:• Erroneous idling


EN-01434

PURGE CONTROLSOLENOID VALVE

E4

B22

E3

B47

B47

3 41 2

5 6

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

SBF-5

BATTERY

MAIN RELAY

12

35

46

29

211 2

B134 ECM

F44

1 2 3 45 6 7 8

E4

1 2

B134

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

B61 F44

2LHD

RH

D

RH

DLHD

E

EN(H4SO)(diag)-173



1)Turn the ignition switch to OFF.2)Connect the test mode connector at the lower portion of instrument panel (on the driver’s side).3)Turn the ignition switch to ON.4)While operating the purge control solenoid valve, measure voltage between ECM and chassis ground.

NOTE:Purge control solenoid valve operation can beexecuted using Subaru Select Monitor. For pro-cedure, refer to “Compulsory Valve OperationCheck Mode”. <Ref. to EN(H4SO)(diag)-48,Compulsory Valve Operation Check Mode.>


Is the voltage 0 — 10 V? Go to step 2. Even if malfunction indicator light light up, the circuit has returned to a nor-mal condition at this time. In this case, repair poor contact in ECM connector.

2 CHECK OUTPUT SIGNAL FROM ECM.1)Turn the ignition switch to ON.2)Measure the voltage between ECM and chassis ground.







4 CHECK HARNESS BETWEEN PURGE CON-TROL SOLENOID VALVE AND ECM CON-NECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from purge control solenoid valve.3)Turn the ignition switch to ON.4)Measure the voltage between ECM and chassis ground.


Is the voltage more than 10 V? Repair battery short circuit in har-ness between ECM and purge control solenoid valve connector. After repair, replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

Go to step 5.

5 CHECK PURGE CONTROL SOLENOID VALVE.1)Turn the ignition switch to OFF.2)Measure the resistance between purge con-trol solenoid valve terminals.



Replace the purge control solenoid valve <Ref. to EC(H4SO)-7, Purge Control Solenoid Valve.> and ECM <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

Go to step 6.





EN(H4SO)(diag)-174


AR:DTC P0462 FUEL LEVEL SENSOR CIRCUIT LOW INPUT• DTC DETECTING CONDITION:



EN-02608

BATTERY

SBF-1SBF-4

B135 ECM

i12A:

i11

i1

B36

i2

B37

B99

R3

C:

COMBINATIONMETER

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

1

B72IGNITIONSWITCH

4No.13

11 3

R15

R57

B22

E3

3

25

16

B72

3 41 2

R58

41 2 3

65

R15

i12

1 2 37 8 9

4 5 613 1410 11 12

i11

1 2 3 4 5 6 7 8 9 10

LHD

B37

i2

14

C7

A2

C6

18 1

i2B99

3 41 2 8 9 10 1112 13 14 15 16 17 18 19 20 21 22 23 24

5 6 7

R583 5

FUELLEVELSENSOR

2

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

3 41 2

EE E

i1

3 41 2 8 9 10 1112 13 14 15 16 17 18 19 20 21 22 23 24

5 6 7

EN(H4SO)(diag)-175


Step Check Yes No1 CHECK SPEEDOMETER AND TACHOME-

TER OPERATION IN COMBINATION METER.

Does the speedometer and tachometer operate normally?

Go to step 2. Repair or replace the combination meter. <Ref. to IDI-3, Combina-tion Meter Sys-tem.>

2 CHECK INPUT SIGNAL FOR ECM.1)Turn the ignition switch to ON. (Engine OFF)2)Measure the voltage between ECM connec-tor and chassis ground.


Is the voltage less than 0.12 V?


EN-01436

BATTERY

SBF-1SBF-4

B135 ECM

i12A:

i11

i2

B37

C:

COMBINATIONMETER

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

1

B72IGNITIONSWITCH

4

B37

i2

No.13

31

C7

A2

C6

221

25

B72

3 41 2

3 41 2

R58

41 2 3

65

R15

B99 i3

B99 i2

1 2 3 4 5 6 7 8 9 1011 12 19 20 2113 14 15 16 17 18 22

i1 i12

1 2 37 8 9

4 5 613 1410 11 12

219

32

1 2 3 4 5 610 11 12 13 14 15

716

23 3019 20

22 26 27 28 29

817

24 3118

25

i11

1 2 3 4 5 6 7 8 9 10

RHD

B99

R3

18 6

R15

R57

B22

E3

2 3

16

R583 5

FUELLEVELSENSOR

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

E E E

EN(H4SO)(diag)-176


3 CHECK INPUT SIGNAL FOR ECM. (USING SUBARU SELECT MONITOR.)Read the data of fuel level sensor signal using Subaru Select Monitor.


Is the voltage less than 0.12 V by shaking the harness and connector of ECM?


Even if malfunction indicator light lights up, the cir-cuit has returned to a normal condi-tion at this time. A temporary poor contact of the con-nector may be the cause.

NOTE:In this case, repairthe following:• Poor contact in combination meter connector• Poor contact in ECM connector• Poor contact in coupling connec-tors

4 CHECK INPUT VOLTAGE OF ECM.1)Turn the ignition switch to OFF.2)Separate fuel tank cord connector (R57) and rear wiring harness connector (R15).3)Turn the ignition switch to ON.4)Measure the voltage of harness between ECM connector and chassis ground.


Is the voltage more than 0.12 V?


5 CHECK HARNESS BETWEEN ECM AND COMBINATION METER.1)Turn the ignition switch to OFF.2)Disconnect the connector from connector (i11) and ECM connector.3)Measure the resistance between ECM and chassis ground.



Go to step 7. Repair ground short circuit in har-ness between ECM and combi-nation meter con-nector.

6 CHECK HARNESS BETWEEN ECM AND COMBINATION METER.Measure the resistance between ECM and combination meter connector.

Connector & terminal(B135) No. 25 — (i12) No. 2:


Repair or replace the combination meter. <Ref. to IDI-3, Combina-tion Meter Sys-tem.>

Repair open circuit between ECM and combination meter connector.

NOTE:In this case, repairthe following:Poor contact in coupling connector

7 CHECK FUEL TANK CORD.1)Disconnect the connector from fuel pump assembly.2)Measure the resistance between fuel pump assembly and chassis ground.

Connector & terminal(R58) No. 3 — Chassis ground:


Go to step 8. Repair ground short circuit in fuel tank cord.

Step Check Yes No

EN(H4SO)(diag)-177


8 CHECK FUEL LEVEL SENSOR.1)Remove the fuel pump assembly. <Ref. to FU(H4SO)-57, Fuel Pump.>2)Measure the resistance between fuel level sensor and terminals with its float set to the full position.


Is the resistance 0.5 — 2.5 Ω? Repair poor con-tact in harness between ECM and combination meter connector.

Replace the fuel level sensor.

Step Check Yes No

EN(H4SO)(diag)-178


AS:DTC P0463 FUEL LEVEL SENSOR CIRCUIT HIGH INPUT• DTC DETECTING CONDITION:



EN-02608

BATTERY

SBF-1SBF-4

B135 ECM

i12A:

i11

i1

B36

i2

B37

B99

R3

C:

COMBINATIONMETER

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

1

B72IGNITIONSWITCH

4No.13

11 3

R15

R57

B22

E3

3

25

16

B72

3 41 2

R58

41 2 3

65

R15

i12

1 2 37 8 9

4 5 613 1410 11 12

i11

1 2 3 4 5 6 7 8 9 10

LHD

B37

i2

14

C7

A2

C6

18 1

i2B99

3 41 2 8 9 10 1112 13 14 15 16 17 18 19 20 21 22 23 24

5 6 7

R583 5

FUELLEVELSENSOR

2

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

3 41 2

EE E

i1

3 41 2 8 9 10 1112 13 14 15 16 17 18 19 20 21 22 23 24

5 6 7

EN(H4SO)(diag)-179


Step Check Yes No1 CHECK SPEEDOMETER AND TACHOME-

TER OPERATION IN COMBINATION METER.

Does the speedometer and tachometer operate normally?

Go to step 2. Repair or replace the combination meter. <Ref. to IDI-3, Combina-tion Meter Sys-tem.>

EN-01436

BATTERY

SBF-1SBF-4

B135 ECM

i12A:

i11

i2

B37

C:

COMBINATIONMETER

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

1

B72IGNITIONSWITCH

4

B37

i2

No.13

31

C7

A2

C6

221

25

B72

3 41 2

3 41 2

R58

41 2 3

65

R15

B99 i3

B99 i2

1 2 3 4 5 6 7 8 9 1011 12 19 20 2113 14 15 16 17 18 22

i1 i12

1 2 37 8 9

4 5 613 1410 11 12

219

32

1 2 3 4 5 610 11 12 13 14 15

716

23 3019 20

22 26 27 28 29

817

24 3118

25

i11

1 2 3 4 5 6 7 8 9 10

RHD

B99

R3

18 6

R15

R57

B22

E3

2 3

16

R583 5

FUELLEVELSENSOR

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

E E E

EN(H4SO)(diag)-180


2 CHECK INPUT SIGNAL FOR ECM.1)Turn the ignition switch to ON. (Engine OFF)2)Measure the voltage between ECM connec-tor and chassis ground.



Go to step 3. Even if malfunction indicator light lights up, the cir-cuit has returned to a normal condi-tion at this time. A temporary poor contact of the con-nector may be the cause.

NOTE:In this case, repairthe following:• Poor contact in fuel pump connec-tor• Poor contact in coupling connector

3 CHECK INPUT VOLTAGE OF ECM.1)Turn the ignition switch to OFF.2)Disconnect the combination meter connector (i12) and ECM connector.3)Turn the ignition switch to ON.4)Measure the voltage of harness between ECM and chassis ground.



Go to step 4. Repair battery short circuit between ECM and combination meter connector.

4 CHECK HARNESS BETWEEN ECM AND FUEL TANK CORD.1)Turn the ignition switch to OFF.2)Separate fuel tank cord connector (R57) and rear wiring harness connector (R15).3)Measure the resistance between ECM and fuel tank cord.

Connector & terminal(B135) No. 25 — (R15) No. 2:


Go to step 5. Repair open circuit between ECM and fuel tank cord.

5 CHECK HARNESS BETWEEN FUEL TANK CORD AND CHASSIS GROUND.Measure the resistance between fuel tank cord and chassis ground.

Connector & terminal(R15) No. 3 — Chassis ground:


Go to step 6. Repair open circuit between fuel tank cord and chassis ground.

NOTE:In this case, repairthe following:Poor contact in coupling connec-tors

6 CHECK FUEL TANK CORD.1)Disconnect the connector from fuel level sen-sor.2)Measure the resistance between fuel level sensor and coupling connector.

Connector & terminal(R57) No. 3 — (R58) No. 5:


Go to step 7. Repair open circuit between coupling connector and fuel level sensor.

7 CHECK FUEL TANK CORD.Measure the resistance between fuel level sen-sor and coupling connector.

Connector & terminal(R57) No. 2 — (R58) No. 3:


Go to step 8. Repair open circuit between coupling connector and fuel level sensor.

Step Check Yes No

EN(H4SO)(diag)-181


8 CHECK FUEL LEVEL SENSOR.1)Remove the fuel pump assembly. <Ref. to FU(H4SO)-57, Fuel Pump.>2)While moving the fuel level sensor float up and down, measure resistance between fuel level sensor terminals.


Is the resistance more than 54.5 Ω?

Replace the fuel level sensor. <Ref. to FU(H4SO)-59, Fuel Level Sen-sor.>

Replace the com-bination meter. <Ref. to IDI-11, Combination Meter Assembly.>

Step Check Yes No

EN(H4SO)(diag)-182


AT:DTC P0483 COOLING FAN RATIONALITY CHECK• DTC DETECTING CONDITION:


• Occurrence of noise• Overheating


NOTE:If the vehicle, with the engine idling, is placed very close to a wall or another vehicle, preventing normal cool-ing function, the OBD system may detect malfunction.

EN(H4SO)(diag)-183


• WIRING DIAGRAM:

EN-02609

BATTERY

SBF-1

No.17

No.18

SBF-4

B72IGNITIONSWITCH

20A

AIR CONDITIONINGRELAY HOLDER

SUBFANRELAY

SUB FANMOTOR

3

4

21242220

F16

F27

21

20A


MAINFANRELAY

MAIN FANMOTOR

1

2

31343230

F17

122

B134 ECM

F45

B6243

F96

B225

13

14

21

RHD

LHD

RHD

LH

D

RHD

LH

D

EE E

LH

D

RH

D

M M

F27

F17

2 1

F16

F27B134

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

F45

3 41 2 8 9 10 1112 13 14 15 16 17 18 19 20 21 22 23 24

5 6 7

B72

3 41 2 1 2

3 41 2

F96

1 2

3 4

5 6 789

1011

1231

32 33 34

35

3613 14

15 16 171819

2021

22 23 24

25 26 272829

30

EN(H4SO)(diag)-184


AU:DTC P0502 VEHICLE SPEED SENSOR CIRCUIT LOW INPUTNOTE:For the diagnostic procedure, refer to DTC P0503. <Ref. to EN(H4SO)(diag)-186, DTC P0503 VEHICLESPEED SENSOR INTERMITTENT/ERRATIC/HIGH, Diagnostic Procedure with Diagnostic Trouble Code(DTC).>



Check the radiator fan motor connec-tor for connecting condition.If connected securely, check radiator fan and fan motor. <Ref. to CO(H4SO)-23, Radiator Main Fan and Fan Motor.> and <Ref. to CO(H4SO)-24, Radiator Sub Fan and Fan Motor.>

EN(H4SO)(diag)-185


AV:DTC P0503 VEHICLE SPEED SENSOR INTERMITTENT/ERRATIC/HIGH• DTC DETECTING CONDITION:



EN-01438

BATTERY

41

2

10

ECM

COMBINATIONMETER

VEHICLE SPEEDSENSOR

31 2

B17

B137

17

TCMB56

IGNITION SWITCH

B72

No. 18

B22

E3

16

MTAT

B17

1 2 3

B72

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

B56

1 2 3 410 11 1219 20 21

135 614 15

7 8 916 17 1822 23 24

B137

415

326

1815 167 8 9 10 11

17 19 2012 13

14

B37i2

B36i1

i2

i11

219

32

1 2 3 4 5 610 11 12 13 14 15

716

23 3019 20

22 26 27 28 29

817

24 3118

25

i11

SBF-4 SBF-1

3 41 2

1 2 3 4 5 6 7 8 9 10

i1

3 41 2 8 9 10 1112 13 14 15 16 17 18 19 20 21 22 23 24

5 6 7

RH

D

RH

D

LH

D

LH

D

11

7

E E

EN(H4SO)(diag)-186


Step Check Yes No1 CHECK TRANSMISSION TYPE. Is the target AT model? Go to step 2. Go to step 3.2 CHECK DTC P0720 ON DISPLAY. Does the Subaru Select Moni-

tor or OBD-II general scan tool indicate DTC P0720?

Check front vehi-cle speed sensor signal circuit. <Ref. to 4AT(diag)-52, DTC 33 FRONT VEHICLE SPEED SENSOR, Diag-nostic Procedure with Diagnostic Trouble Code (DTC).>

Go to step 3.

3 CHECK SPEEDOMETER OPERATION IN COMBINATION METER.

Does the speedometer operate normally?

Go to step 4. Check speedome-ter and vehicle speed sensor. <Ref. to IDI-15, Speedometer.> and <Ref. to 4AT-56, Front Vehicle Speed Sensor.> and <Ref. to 4AT-60, Rear Vehicle Speed Sensor.> and <Ref. to 4AT-61, Torque Con-verter Turbine Speed Sensor.>

4 CHECK HARNESS BETWEEN ECM AND COMBINATION METER CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from combination meter.3)Measure the resistance between ECM and combination meter.

Connector & terminal(B137) No. 10 — (i11) No. 2:




NOTE:In this case, repairthe following:• Open circuit in harness between ECM and combi-nation meter con-nector• Poor contact in ECM connector• Poor contact in combination meter connector• Poor contact in coupling connector

EN(H4SO)(diag)-187


AW:DTC P0506 IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED• DTC DETECTING CONDITION:


• Engine is difficult to start.• Engine does not start.• Erroneous idling• Engine stalls.


EN-02610

B137

B135

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

EE

B47

E7

251436

B22

E3

B21

E2

B22

E3

64

53

21 1

2A

6A

20

A1

9A

5

B2

1D

14

A7

4 13

15

16

SBF-5

BATTERY

MAIN RELAY

IDLEAIR CONTROL

SOLENOIDVALVE

C1

9

A: B134

B: B135 D: B137

ECM

B47

F44

E7

3 41 2

5 6

1 34 5 6

2

B21

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

1 2 3 45 6 7 8

415

326

1815 167 8 9 10 11

17 19 2012 13

14

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

B134

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

B61 F44

2LHD

RH

D

RH

D

LHD

MT

54 6 78

219

310

22 2311 12 13 14 15

24 25 26 2716 17 18

28 2919 20

21 30

B136

C: B136

A:

B:

D:

C:

EN(H4SO)(diag)-188





Go to step 2.

2 CHECK AIR BY-PASS LINE.1)Turn the ignition switch to OFF.2)Remove the idle air control solenoid valve from throttle body. <Ref. to FU(H4SO)-35, REMOVAL, Idle Air Control Solenoid Valve.>3)Remove the throttle body from intake mani-fold. <Ref. to FU(H4SO)-15, REMOVAL, Throt-tle Body.>4)Using an air gun, force air into the idle air control solenoid valve installation area. Con-firm that forced air subsequently escapes from throttle body interior.

Does air flow out? Replace the idle air control solenoid valve. <Ref. to FU(H4SO)-35, INSTALLATION, Idle Air Control Solenoid Valve.>

Replace the throt-tle body. <Ref. to FU(H4SO)-15, INSTALLATION, Throttle Body.>

EN(H4SO)(diag)-189


AX:DTC P0507 IDLE CONTROL SYSTEM RPM HIGHER THAN EXPECTED• DTC DETECTING CONDITION:


• Engine keeps running at higher revolution than specified idling revolution.


EN-02610

B137

B135

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

EE

B47

E7

251436

B22

E3

B21

E2

B22

E3

64

53

21 1

2A

6A

20

A1

9A

5

B2

1D

14

A7

4 13

15

16

SBF-5

BATTERY

MAIN RELAY

IDLEAIR CONTROL

SOLENOIDVALVE

C1

9

A: B134

B: B135 D: B137

ECM

B47

F44

E7

3 41 2

5 6

1 34 5 6

2

B21

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

1 2 3 45 6 7 8

415

326

1815 167 8 9 10 11

17 19 2012 13

14

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

B134

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

B61 F44

2LHD

RH

D

RH

D

LHD

MT

54 6 78

219

310

22 2311 12 13 14 15

24 25 26 2716 17 18

28 2919 20

21 30

B136

C: B136

A:

B:

D:

C:

EN(H4SO)(diag)-190





Go to step 2.

2 CHECK AIR INTAKE SYSTEM.1)Turn the ignition switch to ON.2)Start the engine, and idle it.3)Check the following items.•Loose installation of intake manifold, idle air control solenoid valve and throttle body•Cracks of intake manifold gasket, idle air con-trol solenoid valve gasket and throttle body gasket•Disconnections of vacuum hoses

Is there a fault in air intake sys-tem?

Repair air suction and leaks.

Go to step 3.

3 CHECK THROTTLE CABLE. Is throttle cable play correct? Go to step 4. Adjust throttle cable. <Ref. to SP(H4SO)-9, INSTALLATION, Accelerator Con-trol Cable.>

4 CHECK AIR BY-PASS LINE.1)Turn the ignition switch to OFF.2)Remove the idle air control solenoid valve from throttle body. <Ref. to FU(H4SO)-35, REMOVAL, Idle Air Control Solenoid Valve.>3)Confirm that there are no foreign particles in air by-pass line.

Is air by-pass line clogged by foreign particles?

Remove foreign particles from air by-pass line.

Replace the idle air control solenoid valve. <Ref. to FU(H4SO)-35, INSTALLATION, Idle Air Control Solenoid Valve.>

EN(H4SO)(diag)-191


AY:DTC P0512 STARTER REQUEST CIRCUIT• DTC DETECTING CONDITION:


• Failure of engine to start


EN(H4SO)(diag)-192


• WIRING DIAGRAM:

EN-02607

12

7

P R N D 3 2 1

SBF-4 SBF-1

B14

B72

12

11

T7T3B12

13

1

2

1

2

T7

1 2 3 4 5 67 8 9 10 11 12

B72

20

B136 ECM

: AT MODEL

: MT MODEL

1

2

B12

1 2 3 45 6 7 89 10 11 12

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

3 41 2

E

E

WS

WS

OS

OS

4

2

B323

B323

: WITH SECURITY EXCEPT FOR AUSTRALIA MODEL

: WITH SECURITY FOR AUSTRALIA MODEL AND WITHOUT SECURITY

WS

OS

IGNITIONSWITCH

BATTERY

INHIBITOR SWITCH

STARTERMOTOR

EN(H4SO)(diag)-193


Step Check Yes No1 CHECK OPERATION OF STARTER MOTOR.

Turn the ignition switch to ON.

NOTE:Place the inhibitor switch in each position. (ATmodel)Depress or release the clutch pedal. (MT model)

Dose the starter motor oper-ate?

Repair battery short circuit in starter motor cir-cuit.

Check starter motor circuit. <Ref. to EN(H4SO)(diag)-60, STARTER MOTOR CIR-CUIT, Diagnostics for Engine Start-ing Failure.>

EN(H4SO)(diag)-194


AZ:DTC P0519 IDLE CONTROL SYSTEM MALFUNCTION (FAIL-SAFE)• DTC DETECTING CONDITION:


• Engine keeps running at higher revolution than specified idling revolution.


EN-02610

B137

B135

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

EE

B47

E7

251436

B22

E3

B21

E2

B22

E3

64

53

21 1

2A

6A

20

A1

9A

5

B2

1D

14

A7

4 13

15

16

SBF-5

BATTERY

MAIN RELAY

IDLEAIR CONTROL

SOLENOIDVALVE

C1

9

A: B134

B: B135 D: B137

ECM

B47

F44

E7

3 41 2

5 6

1 34 5 6

2

B21

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

1 2 3 45 6 7 8

415

326

1815 167 8 9 10 11

17 19 2012 13

14

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

B134

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

B61 F44

2LHD

RH

D

RH

D

LHD

MT

54 6 78

219

310

22 2311 12 13 14 15

24 25 26 2716 17 18

28 2919 20

21 30

B136

C: B136

A:

B:

D:

C:

EN(H4SO)(diag)-195


BA:DTC P0558 GENERATOR CIRCUIT LOW INPUTCAUTION:For diagnostic procedure, refer to DTC P0559. <Ref. to EN(H4SO)(diag)-197, DTC P0559 GENERATOR CIRCUIT HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>.




Go to step 2.

2 CHECK AIR INTAKE SYSTEM.1)Turn the ignition switch to ON.2)Start the engine, and idle it.3)Check the following items.•Loose installation of intake manifold, idle air control solenoid valve and throttle body•Cracks of intake manifold gasket, idle air con-trol solenoid valve gasket and throttle body gasket•Disconnections of vacuum hoses

Is there a fault in air intake sys-tem?

Repair air suction and leaks.

Go to step 3.

3 CHECK THROTTLE CABLE. Is throttle cable play correct? Go to step 4. Adjust throttle cable. <Ref. to SP(H4SO)-9, INSTALLATION, Accelerator Con-trol Cable.>

4 CHECK AIR BY-PASS LINE.1)Turn the ignition switch to OFF.2)Remove the idle air control solenoid valve from throttle body. <Ref. to FU(H4SO)-35, Idle Air Control Solenoid Valve.>3)Confirm that there are no foreign particles in air by-pass line.

Is air by-pass line clogged by foreign particles?

Remove foreign particles from air by-pass line.

Replace the idle air control solenoid valve. <Ref. to FU(H4SO)-35, Idle Air Control Sole-noid Valve.>

EN(H4SO)(diag)-196


BB:DTC P0559 GENERATOR CIRCUIT HIGH INPUT• DTC DETECTING CONDITION:



EN-01441

B62

B136

F45

F26

F26

ECM

GENERATOR

25

3

1 2 3LHD : 19RHD : 4

F45

3 41 2 8 9 10 1112 13 14 15 16 17 18 19 20 21 22 23 24

5 6 7

F45

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18

LHD:

RHD:

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

EN(H4SO)(diag)-197


Step Check Yes No1 CHECK HARNESS BETWEEN GENERATOR

AND ECM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from generator and ECM.3)Measure the resistance of harness between generator connector and engine ground.

Connector & terminal(F26) No. 3 — Engine ground:


Go to step 2. Repair the ground short circuit in har-ness between ECM and purge control solenoid valve connector.

2 CHECK HARNESS BETWEEN GENERATOR AND ECM CONNECTOR.Measure the resistance of harness between ECM and generator of harness connector.

Connector & terminal(B136) No. 25 — (F26) No. 3:


Repair poor con-tact in connector.

Repair the open circuit in harness between ECM and generator connec-tor.

NOTE:In this case, repairthe following:• Open circuit in harness between ECM and genera-tor connector• Poor contact in coupling connector

EN(H4SO)(diag)-198


BC:DTC P0562 SYSTEM VOLTAGE LOW• DTC DETECTING CONDITION:


• Charge warning light comes on.


EN-01442

E

SBF-5

SBF-1

64

53

21

B135

B47

ECM

1 2

B47

3 41 2

5 6

B61 F44

2LHD

RH

D

RH

DLHD

F44

1 2 3 45 6 7 8

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

MAIN RELAY

GENERATOR

BATTERY

EN(H4SO)(diag)-199


Step Check Yes No1 CHECK GENERATOR.

1)Start the engine.2)Idle after warm-up.3)Measure the voltage between generator B terminal and chassis ground.

TerminalGenerator B terminal (+) — Chassis ground (–):


Go to step 2. Repair the genera-tor. <Ref. to SC(H4SO)-13, Generator.>

2 CHECK GENERATOR.1)Run the engine at 5,000 rpm.2)Measure the voltage between generator B terminal and chassis ground.

TerminalGenerator B terminal (+) — Chassis ground (−−−−):



3 CHECK BATTERY TERMINAL.Turn the ignition switch to OFF.

Are the positive and ground battery terminals tightly clamped?

Go to step 4. Tighten the clamp of terminal.

4 CHECK INPUT VOLTAGE OF ECM.1)Run the engine at idle.2)Measure the voltage between ECM connec-tor and chassis ground.



Go to step 5. Repair the har-ness connector between battery, main relay and ECM.

5 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-nectors between generator, battery and ECM?

Repair the con-nector.

Go to step 6.

6 CHECK ECM.1)Connect all connectors.2)Erase the memory. 3)Perform inspection mode. 4)Read out the DTC.

Is the same DTC as in the cur-rent diagnosis still being out-put?

Replace the gen-erator. <Ref. to SC(H4SO)-13, Generator.>

Go to step 7.

7 CHECK ANY OTHER DTC ON DISPLAY. Is there any other DTC on dis-play?

Check the rele-vant DTC using the List of Diag-nostic Trouble Code (DTC). <Ref. to EN(H4SO)(diag)-74, List of Diag-nostic Trouble Code (DTC).>

A temporary poor contact.

EN(H4SO)(diag)-200


BD:DTC P0563 SYSTEM VOLTAGE HIGH• DTC DETECTING CONDITION:


• Charge warning light comes on.


EN-01442

E

SBF-5

SBF-1

64

53

21

B135

B47

ECM

1 2

B47

3 41 2

5 6

B61 F44

2LHD

RH

D

RH

DLHD

F44

1 2 3 45 6 7 8

B135

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

MAIN RELAY

GENERATOR

BATTERY

EN(H4SO)(diag)-201


Step Check Yes No1 CHECK GENERATOR.

1)Start the engine.2)Idle after warm-up.3)Measure the voltage between generator B terminal and chassis ground.

TerminalGenerator B terminal (+) — Chassis ground (–):



2 CHECK GENERATOR.1)Run the engine at 5,000 rpm.2)Measure the voltage between generator B terminal and chassis ground.

TerminalGenerator B terminal (+) — Chassis ground (−−−−):



3 CHECK BATTERY TERMINAL.Turn the ignition switch to OFF.

Are the positive and ground battery terminals tightly clamped?

Go to step 4. Tighten the clamp of terminal.

4 CHECK INPUT VOLTAGE OF ECM.1)Run the engine at idle.2)Measure the voltage between ECM connec-tor and chassis ground.



Go to step 5. Repair the har-ness connector between battery, main relay and ECM.

5 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-nectors between generator, battery and ECM?

Repair the con-nector.

Go to step 6.

6 CHECK ECM.1)Connect all connectors.2)Erase the memory. 3)Perform the inspection mode. 4)Read out the DTC.

Is the same DTC as in the cur-rent diagnosis still being out-put?

Replace the gen-erator. <Ref. to SC(H4SO)-13, Generator.>

Go to step 7.

7 CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check the rele-vant DTC using the List of Diag-nostic Trouble Code (DTC). <Ref. to EN(H4SO)(diag)-74, List of Diag-nostic Trouble Code (DTC).>

A temporary poor contact.

EN(H4SO)(diag)-202


BE:DTC P0604 INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY (RAM) ERROR


• TROUBLE SYMPTOM:• Engine does not start.• Engine stalls.


EN-01444

B72

3 41 2

BATTERYIGNITIONSWITCH

MAIN RELAY

SBF-4 SBF-1

SBF-5

B72

B2

B1

C1

2C

16

B2

1

C5

A3

5A

7C

26

D1

4B

9

C1

0C

23

B47

E3

B22

12

35

64

ECM

EE

14

B134

B135

B136

A :

C :

D : B137

B :

C1

9

8 15 16

14

13

E

3 41 2

5 6

1 2 3 45 6 7 89 10 11 12

13 14 15 16

B137 B135B22B47

MT

F44

B134

1 2 3 45 6 7 8

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

415

326

1815 167 8 9 10 11

17 19 2012 13

14

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

No.11

B61 F44

2LHD

RH

D

RH

D

LHD

EN(H4SO)(diag)-203


Step Check Yes No1 CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check the rele-

vant DTC using the List of Diag-nostic Trouble Code (DTC). <Ref. to EN(H4SO)(diag)-74, List of Diag-nostic Trouble Code (DTC).>

A temporary poor contact occurs.

EN(H4SO)(diag)-204


BF:DTC P0691 COOLING FAN 1 CONTROL CIRCUIT LOW• DTC DETECTING CONDITION:


• Radiator fan does not operate properly.• Overheating


EN(H4SO)(diag)-205


• WIRING DIAGRAM:

EN-02609

BATTERY

SBF-1

No.17

No.18

SBF-4

B72IGNITIONSWITCH

20A


SUBFANRELAY

SUB FANMOTOR

3

4

21242220

F16

F27

21

20A


MAINFANRELAY

MAIN FANMOTOR

1

2

31343230

F17

122

B134 ECM

F45

B6243

F96

B225

13

14

21

RHD

LHD

RHD

LH

D

RHD

LH

D

EE E

LH

D

RH

D

M M

F27

F17

2 1

F16

F27B134

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

F45

3 41 2 8 9 10 1112 13 14 15 16 17 18 19 20 21 22 23 24

5 6 7

B72

3 41 2 1 2

3 41 2

F96

1 2

3 4

5 6 789

1011

1231

32 33 34

35

3613 14

15 16 171819

2021

22 23 24

25 26 272829

30

EN(H4SO)(diag)-206



1)Turn the ignition switch to OFF.2)Connect the test mode connector at the lower portion of instrument panel (on the driver’s side).3)Turn the ignition switch to ON.4)While operating the radiator fan relay, mea-sure voltage between ECM terminal and ground.

NOTE:Radiator fan relay operation can be executedusing Subaru Select Monitor. For procedure,refer to “Compulsory Valve Operation CheckMode”. <Ref. to EN(H4SO)(diag)-32, SubaruSelect Monitor.>


Is the voltage 0 — 10 V? Repair poor con-tact in ECM con-nector.

Go to step 2.

2 CHECK GROUND SHORT CIRCUIT IN RADI-ATOR MAIN FAN RELAY CONTROL CIR-CUIT.1)Turn the ignition switch to OFF.2)Disconnect the connectors from ECM.3)Measure the resistance of harness between ECM connector and chassis ground.



Repair ground short circuit in radiator main fan relay control cir-cuit.

Go to step 3.

3 CHECK POWER SUPPLY FOR RELAY.1)Remove the main fan relay from A/C relay holder.2)Turn the ignition switch to ON.3)Measure the voltage between fuse and relay box (F/B) connector and chassis ground.

Connector & terminal(F27) No. 34 (+) — Chassis ground (−−−−):

Is the voltage more than 10 V? Go to step 4. Repair open circuit in harness between ignition switch and fuse and relay box (F/B) connector.

4 CHECK MAIN FAN RELAY.1)Turn the ignition switch to OFF.2)Measure the resistance between main fan relay terminals.

TerminalNo. 32 — No. 34:

Is the resistance 87 — 107 Ω? Go to step 5. Replace the main fan relay.

5 CHECK OPEN CIRCUIT IN MAIN FAN RE-LAY CONTROL CIRCUIT.Measure the resistance of harness between ECM and main fan relay connector.

Connector & terminal(B134) No. 14 — (F27) No. 32:



NOTE:In this case, repairthe following:• Open circuit in harness between ECM and main fan relay connector• Poor contact in coupling connector

6 CHECK POOR CONTACT.Check poor contact in ECM or main fan relay connector.

Is there poor contact in ECM or main fan relay connector?

Repair poor con-tact in ECM or main fan relay con-nector.


EN(H4SO)(diag)-207


BG:DTC P0692 COOLING FAN 1 CONTROL CIRCUIT HIGH• DTC DETECTING CONDITION:


• Radiator fan does not operate properly.• Overheating


EN(H4SO)(diag)-208


• WIRING DIAGRAM:

EN-02609

BATTERY

SBF-1

No.17

No.18

SBF-4

B72IGNITIONSWITCH

20A


SUBFANRELAY

SUB FANMOTOR

3

4

21242220

F16

F27

21

20A


MAINFANRELAY

MAIN FANMOTOR

1

2

31343230

F17

122

B134 ECM

F45

B6243

F96

B225

13

14

21

RHD

LHD

RHD

LH

D

RHD

LH

D

EE E

LH

D

RH

D

M M

F27

F17

2 1

F16

F27B134

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

F45

3 41 2 8 9 10 1112 13 14 15 16 17 18 19 20 21 22 23 24

5 6 7

B72

3 41 2 1 2

3 41 2

F96

1 2

3 4

5 6 789

1011

1231

32 33 34

35

3613 14

15 16 171819

2021

22 23 24

25 26 272829

30

EN(H4SO)(diag)-209



1)Turn the ignition switch to OFF.2)Connect the test mode connector at the lower portion of instrument panel (on the drive’s side).3)Turn the ignition switch to ON.4)While operating the radiator fan relay, mea-sure voltage between ECM and chassis ground.

NOTE:Radiator fan relay operation can be executedusing Subaru Select Monitor. For procedure,refer to “Compulsory Valve Operation CheckMode”. <Ref. to EN(H4SO)(diag)-48, Compul-sory Valve Operation Check Mode.>


Is the voltage 0 — 10 V? Even if malfunction indicator light lights up, the cir-cuit has returned to a normal condi-tion at this time. In this case, repair poor contact in ECM connector.

Go to step 2.

2 CHECK SHORT CIRCUIT IN RADIATOR FAN RELAY CONTROL CIRCUIT.1)Turn the ignition switch to OFF.2)Remove the main fan relay and sub fan relay. (with A/C models)3)Disconnect the test mode connector.4)Turn the ignition switch to ON.5)Measure the voltage between ECM and chassis ground.


Is the voltage more than 10 V? Repair battery short circuit in radiator fan relay control circuit. After repair, replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

Go to step 3.

3 CHECK MAIN FAN RELAY.1)Turn the ignition switch to OFF.2)Remove the main fan relay.3)Measure the resistance between main fan relay terminals.



Replace the main fan relay and ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

Go to step 4.

4 CHECK SUB FAN RELAY.1)Remove the sub fan relay.2)Measure the resistance between sub fan relay terminals.



Replace the sub fan relay and ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

Go to step 5.





EN(H4SO)(diag)-210


BH:DTC P0703 TORQUE CONVERTER/BRAKE SWITCH “B” CIRCUIT• DTC DETECTING CONDITION:



Step Check Yes No1 CHECK OPERATION OF BRAKE LIGHT. Does the brake light illuminate

when depressing the brake pedal?

Go to step 2. Repair or replace the brake light cir-cuit.

EN-02621

BATTERY

TO STOP LIGHTS

SBF-1SBF-2No.16

B64

BRAKELIGHTSWITCH

1

B64

1 2

B55

B55

12

TCM

2

1 2 3 410 11 1219 20 21

135 614 15

7 8 916 17 1822 23 24

E

**

LHD: 2RHD: 1

LHD: 1RHD: 2

2*

1*

EN(H4SO)(diag)-211


2 CHECK HARNESS BETWEEN TCM AND BRAKE LIGHT SWITCH CONNECTOR.1)Disconnect the connectors from TCM and brake light switch.2)Measure the resistance of harness between TCM and brake light switch connector.

Connector & terminalLHD

(B55) No. 12 — (B64) No. 1:RHD

(B55) No. 12 — (B64) No. 2:


Go to step 3. Repair or replace the harness and connector.

NOTE:In this case, repairthe following:• Open circuit in harness between TCM and brake light switch con-nector• Poor contact in TCM connector• Poor contact in brake light switch connector

3 CHECK HARNESS BETWEEN TCM AND BRAKE LIGHT SWITCH CONNECTOR.Measure the resistance of harness between TCM and chassis ground.



Go to step 4. Repair ground short circuit in har-ness between TCM and brake light switch con-nector.

4 CHECK INPUT SIGNAL FOR TCM.1)Connect the connectors to TCM and brake light switch.2)Measure the voltage between TCM and chassis ground.


Is the voltage less than 1 V when releasing the brake pedal?

Go to step 5. Adjust or replace the brake light switch. <Ref. to LI-8, STOP LIGHT SWITCH, INSPECTION, Stop Light Sys-tem.>

5 CHECK INPUT SIGNAL FOR TCM.Measure the voltage between TCM and chas-sis ground.


Is the voltage more than 10 V when depressing the brake pedal?

Go to step 6. Adjust or replace the brake light switch. <Ref. to LI-8, STOP LIGHT SWITCH, INSPECTION, Stop Light Sys-tem.>

6 CHECK POOR CONTACT.Check poor contact in TCM connector.

Is there poor contact in TCM connector?

Repair poor con-tact in TCM con-nector.

Replace the TCM. <Ref. to 4AT-74, Transmission Con-trol Module (TCM).>

Step Check Yes No

EN(H4SO)(diag)-212


BI: DTC P0731 GEAR 1 INCORRECT RATIONOTE:For the diagnostic procedure, refer to DTC P0734. <Ref. to EN(H4SO)(diag)-214, DTC P0734 GEAR 4 IN-CORRECT RATIO, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

BJ:DTC P0732 GEAR 2 INCORRECT RATIONOTE:For the diagnostic procedure, refer to DTC P0734. <Ref. to EN(H4SO)(diag)-214, DTC P0734 GEAR 4 IN-CORRECT RATIO, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

BK:DTC P0733 GEAR 3 INCORRECT RATIONOTE:For the diagnostic procedure, refer to DTC P0734. <Ref. to EN(H4SO)(diag)-214, DTC P0734 GEAR 4 IN-CORRECT RATIO, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

EN(H4SO)(diag)-213


BL:DTC P0734 GEAR 4 INCORRECT RATIO• DTC DETECTING CONDITION:


• Shift point too high or too low; engine brake not effected in “3” range; excessive shift shock; excessivetight corner “braking”


Step Check Yes No1 CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect relevant

DTC using “List of Diagnostic Trou-ble Code (DTC)”. <Ref. to EN(H4SO)(diag)-74, List of Diag-nostic Trouble Code (DTC).>

Go to step 2.

2 CHECK THROTTLE POSITION SENSOR CIRCUIT.Check throttle position sensor circuit. <Ref. to 4AT(diag)-47, DTC 31 THROTTLE POSITION SENSOR, Diagnostic Procedure with Diagnos-tic Trouble Code (DTC).>

Is there any trouble in throttle position sensor circuit?

Repair or replace the throttle posi-tion sensor circuit.

Go to step 3.

3 CHECK FRONT VEHICLE SPEED SENSOR CIRCUIT.Check front vehicle speed sensor circuit. <Ref. to 4AT(diag)-52, DTC 33 FRONT VEHICLE SPEED SENSOR, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

Is there any trouble in front vehicle speed sensor circuit?

Repair or replace the front vehicle speed sensor cir-cuit.

Go to step 4.

4 CHECK TORQUE CONVERTER TURBINE SPEED SENSOR CIRCUIT.Check torque converter turbine speed sensor circuit. <Ref. to 4AT(diag)-56, DTC 36 TORQUE CONVERTER TURBINE SPEED SENSOR, Diagnostic Procedure with Diagnos-tic Trouble Code (DTC).>

Is there any trouble in torque converter turbine speed sensor circuit?

Repair or replace the torque con-verter turbine speed sensor cir-cuit.

Go to step 5.




Go to step 6.

6 CHECK MECHANICAL TROUBLE.Check mechanical trouble in automatic trans-mission.

Is there any mechanical trouble in automatic transmission?

Repair or replace the automatic transmission. <Ref. to 4AT-34, INSPECTION, Road Test.>


EN(H4SO)(diag)-214


BM:DTC P0741 TORQUE CONVERTER CLUTCH CIRCUIT PERFORMANCE OR STUCK OFF


• TROUBLE SYMPTOM:• No lock-up (after engine warm-up)• No shift or excessive tight corner “braking”




Go to step 2.

2 CHECK LOCK-UP DUTY SOLENOID CIR-CUIT.Check lock-up duty solenoid circuit. <Ref. to 4AT(diag)-81, DTC 77 LOCK-UP DUTY SOLENOID, Diagnostic Procedure with Diag-nostic Trouble Code (DTC).>

Is there any trouble in lock-up duty solenoid circuit?

Repair or replace the lock-up duty solenoid circuit.

Go to step 3.

3 CHECK THROTTLE POSITION SENSOR CIRCUIT.Check throttle position sensor circuit. <Ref. to 4AT(diag)-47, DTC 31 THROTTLE POSITION SENSOR, Diagnostic Procedure with Diagnos-tic Trouble Code (DTC).>

Is there any trouble in throttle position sensor circuit?

Repair or replace the throttle posi-tion sensor circuit.

Go to step 4.

4 CHECK TORQUE CONVERTER TURBINE SPEED SENSOR CIRCUIT.Check torque converter turbine speed sensor circuit. <Ref. to 4AT(diag)-56, DTC 36 TORQUE CONVERTER TURBINE SPEED SENSOR, Diagnostic Procedure with Diagnos-tic Trouble Code (DTC).>

Is there any trouble in torque converter turbine speed sensor circuit?

Repair or replace the torque con-verter turbine speed sensor cir-cuit.

Go to step 5.

5 CHECK ENGINE SPEED INPUT CIRCUIT.Check engine speed input circuit. <Ref. to 4AT(diag)-40, DTC 11 ENGINE SPEED SIG-NAL, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

Is there any trouble in engine speed input circuit?

Repair or replace the engine speed input circuit.

Go to step 6.

6 CHECK INHIBITOR SWITCH CIRCUIT.Check inhibitor switch circuit. <Ref. to 4AT(diag)-107, CHECK INHIBITOR SWITCH, Diagnostic Procedure without Diagnostic Trou-ble Code (DTC).>

Is there any trouble in inhibitor switch circuit?

Repair or replace the inhibitor switch circuit.

Go to step 7.

7 CHECK BRAKE LIGHT SWITCH CIRCUIT.Check brake light switch circuit. <Ref. to 4AT(diag)-99, CHECK BRAKE SWITCH, Diag-nostic Procedure without Diagnostic Trouble Code (DTC).>

Is there any trouble in brake light switch circuit?

Repair or replace the brake light switch circuit.

Go to step 8.

EN(H4SO)(diag)-215


8 CHECK ATF TEMPERATURE SENSOR CIR-CUIT.Check ATF temperature sensor circuit. <Ref. to 4AT(diag)-44, DTC 27 ATF TEMPERA-TURE SENSOR, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

Is there any trouble in ATF tem-perature sensor circuit?

Repair or replace the ATF tempera-ture sensor circuit.

Go to step 9.




Go to step 10.

10 CHECK MECHANICAL TROUBLE.Check mechanical trouble in automatic trans-mission.

Is there any mechanical trouble in automatic transmission?

Repair or replace the automatic transmission. <Ref. to 4AT-34, INSPECTION, Road Test.>


Step Check Yes No

EN(H4SO)(diag)-216


BN:DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT LOW• DTC DETECTING CONDITION:


• Erroneous idling


EN-02612

B12 T3

B14

T7

P R N D 3 2 1

12

7

12

11

B12

T7

1 2 3 4 5 67 8 9 10 11 12

1 2 3 45 6 7 89 10 11 12

B136 ECM

21

16

MT

AT

1 2

B25

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

E

M

12

INHIBITOR SWITCH

STARTER MOTOR

NEUTRALPOSITIONSWITCH

E3

B22

B25

T2

B25

T2

EN(H4SO)(diag)-217


Step Check Yes No1 CHECK OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect DTC

P0705 using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)-74, List of Diag-nostic Trouble Code (DTC).>

Go to step 2.

2 CHECK INPUT SIGNAL FOR ECM.1)Turn the ignition switch to ON.2)Place the select lever except for “N” and “P” ranges.3)Measure the voltage between ECM and chassis ground.


Is the voltage 4.5 — 5.5 V? Even if malfunction indicator light lights up, the cir-cuit has returned to a normal condi-tion at this time.

Go to step 3.

3 CHECK HARNESS BETWEEN ECM AND TRANSMISSION HARNESS CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from ECM and transmission harness connector (T3).3)Measure the resistance of harness between ECM connector and chassis ground.



Go to step 4. Repair ground short circuit in har-ness between ECM and trans-mission harness connector.

4 CHECK TRANSMISSION HARNESS CON-NECTOR.1)Disconnect the connector from inhibitor switch.2)Measure the resistance of harness between transmission harness connector and engine ground.

Connector & terminal(T3) No. 12 — Engine ground:


Go to step 5. Repair ground short circuit in har-ness between transmission har-ness and inhibitor switch connector.

5 CHECK INHIBITOR SWITCH.Measure the resistance between inhibitor switch connector the receptacle’s terminals in select lever except for “N” range.



Go to step 6. Replace the inhibi-tor switch. <Ref. to 4AT-52, Inhibitor Switch.>

6 CHECK SELECTOR CABLE CONNECTION. Is there any fault in selector cable connection to inhibitor switch?

Repair selector cable connection. <Ref. to CS-14, INSPECTION, Select Cable.>



EN(H4SO)(diag)-218


BO:DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT LOW (AT VEHICLES)• DTC DETECTING CONDITION:




EN-02612

B12 T3

B14

T7

P R N D 3 2 1

12

7

12

11

B12

T7

1 2 3 4 5 67 8 9 10 11 12

1 2 3 45 6 7 89 10 11 12

B136 ECM

21

16

MT

AT

1 2

B25

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

E

M

12

INHIBITOR SWITCH

STARTER MOTOR


E3

B22

B25

T2

B25

T2

EN(H4SO)(diag)-219



1)Turn the ignition switch to ON.2)Place the shift lever in neutral.3)Measure the voltage between ECM and chassis ground.



2 CHECK INPUT SIGNAL FOR ECM.1)Place the shift lever in a position except for neutral.2)Measure the voltage between ECM and chassis ground.







4 CHECK NEUTRAL POSITION SWITCH.1)Turn the ignition switch to OFF.2)Disconnect the connector from transmission harness.3)Place the shift lever in neutral.4)Measure the resistance between transmis-sion harness and connector terminals.

Connector & terminal(T2) No. 1 — No. 2:


Go to step 5. Repair short circuit in transmission harness or replace neutral position switch.

5 CHECK NEUTRAL POSITION SWITCH.1)Place the shift lever in a position except for neutral.2)Measure the resistance between transmis-sion harness connector terminals.


Go to step 6. Repair short circuit in transmission harness or replace neutral position switch.

6 CHECK HARNESS BETWEEN ECM AND NEUTRAL POSITION SWITCH CONNEC-TOR.Measure the resistance between ECM and chassis ground.



Go to step 7. Repair ground short circuit in har-ness between ECM and trans-mission harness connector.

7 CHECK HARNESS BETWEEN ECM AND NEUTRAL POSITION SWITCH CONNEC-TOR.1)Disconnect the connector from ECM.2)Measure the resistance of harness between ECM and transmission harness connector.



Go to step 8. Repair open circuit in harness between ECM and transmission har-ness connector.

8 CHECK HARNESS BETWEEN ECM AND NEUTRAL POSITION SWITCH CONNEC-TOR.Measure the resistance of harness between transmission harness connector and engine ground.

Connector & terminal(B25) No. 2 — Engine ground:


Go to step 9. Repair open circuit between transmis-sion harness con-nector and engine ground terminal.

9 CHECK POOR CONTACT.Check poor contact in transmission harness connector.

Is there poor contact in trans-mission harness connector?

Repair poor con-tact in transmis-sion harness connector.


EN(H4SO)(diag)-220


BP:DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT HIGH (AT MODEL)• DTC DETECTING CONDITION:




EN-02612

B12 T3

B14

T7

P R N D 3 2 1

12

7

12

11

B12

T7

1 2 3 4 5 67 8 9 10 11 12

1 2 3 45 6 7 89 10 11 12

B136 ECM

21

16

MT

AT

1 2

B25

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

E

M

12

INHIBITOR SWITCH

STARTER MOTOR


E3

B22

B25

T2

B25

T2

EN(H4SO)(diag)-221


Step Check Yes No1 CHECK OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect DTC using


Go to step 2.

2 CHECK INPUT SIGNAL FOR ECM.1)Turn the ignition switch to ON.2)Measure the voltage between ECM and chassis ground in select lever “N” and “P” ranges.



3 CHECK INPUT SIGNAL FOR ECM.Measure the voltage between ECM and chas-sis ground in select lever except for “N” and “P” ranges.


Is the voltage 4.5 — 5.5 V? Go to step 4. Go to step 5.








Is the voltage more than 10 V? Repair battery short circuit in har-ness between ECM and inhibitor switch connector.

Go to step 6.

6 CHECK HARNESS BETWEEN ECM AND IN-HIBITOR SWITCH CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from ECM and inhibitor switch.3)Measure the resistance of harness between ECM and inhibitor switch connector.

Connector & terminal(B136) No. 21 — (T7) No. 12:



NOTE:In this case, repairthe following:• Open circuit in harness between ECM and inhibitor switch connector• Poor contact in coupling connector• Poor contact in inhibitor switch connector• Poor contact in ECM connector

EN(H4SO)(diag)-222


7 CHECK INHIBITOR SWITCH GROUND LINE.Measure the resistance of harness between inhibitor switch connector and engine ground.

Connector & terminal(T7) No. 7 — Engine ground:


Go to step 8. Repair open circuit in harness between inhibitor switch connector and starter motor ground line.

NOTE:In this case, repairthe following:• Open circuit in harness between inhibitor switch connector and starter motor ground line• Poor contact in starter motor con-nector• Poor contact in starter motor ground• Starter motor

8 CHECK INHIBITOR SWITCH.Measure the resistance between inhibitor switch connector receptacle’s terminals in select lever “N” and “P” ranges.



Go to step 9. Replace the inhibi-tor switch. <Ref. to 4AT-52, Inhibitor Switch.>

9 CHECK SELECTOR CABLE CONNECTION. Is there any fault in selector cable connection to inhibitor switch?

Repair selector cable connection. <Ref. to CS-14, INSPECTION, Select Cable.>



Step Check Yes No

EN(H4SO)(diag)-223


BQ:DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT HIGH (MT MODEL)• DTC DETECTING CONDITION:




EN-02612

B12 T3

B14

T7

P R N D 3 2 1

12

7

12

11

B12

T7

1 2 3 4 5 67 8 9 10 11 12

1 2 3 45 6 7 89 10 11 12

B136 ECM

21

16

MT

AT

1 2

B25

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

E

M

12

INHIBITOR SWITCH

STARTER MOTOR


E3

B22

B25

T2

B25

T2

EN(H4SO)(diag)-224



1)Turn the ignition switch to ON.2)Set the shift lever to except neutral position.3)Measure the voltage between ECM and chassis ground.



2 CHECK INPUT SIGNAL FOR ECM.1)Set the shift lever to neutral position.2)Measure the voltage between ECM and chassis ground.





Repair the poor contact in ECM connector.

Contact your Sub-aru distributor ser-vice.

4 CHECK INPUT SIGNAL FOR ECM.1)Disconnect ECM connector from ECM.2)Measure the voltage between ECM and chassis ground.


Is the voltage more than 10 V? Repair the battery short circuit in har-ness between ECM and trans-mission connector.

Go to step 5.

5 CHECK HARNESS BETWEEN ECM AND TRANSMISSION HARNESS CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from ECM and transmission harness connector (T2).3)Measure the resistance of harness between ECM and neutral switch connector.



Go to step 6. Repair the har-ness and connec-tor.

NOTE:In this case, repairthe following:• Open circuit in harness between ECM and trans-mission harness• Poor contact in transmission har-ness connector• Poor contact in ECM connector

6 CHECK NEUTRAL POSITION SWITCH GROUND LINE.Measure the resistance of harness between transmission harness connector and engine ground.

Connector & terminal(B25) No. 2 — Engine ground:


Go to step 7. Repair the open circuit in harness of neutral position switch ground line.

7 CHECK NEUTRAL POSITION SWITCH.1)Set the shift lever to except neutral position.2)Measure the resistance between transmis-sion harness connector receptacle’s terminals.



Go to step 8. Replace the neu-tral position switch.

8 CHECK POOR CONTACT.Check poor contact in the transmission har-ness connector.

Is there poor contact in the transmission harness connec-tor?

Repair poor con-tact in transmis-sion harness connector.

Contact your Sub-aru distributor ser-vice.

EN(H4SO)(diag)-225


BR:DTC P0864 TCM COMMUNICATION CIRCUIT RANGE/PERFORMANCE• DTC DETECTING CONDITION:



Step Check Yes No1 CHECK DRIVING CONDITION.

1)Start and warm-up the engine until the radia-tor fan makes one complete rotation.2)Drive the vehicle.

Is the AT shift control function-ing properly?

Go to step 2. Replace the TCM. <Ref. to 4AT-74, Transmission Con-trol Module (TCM).>

EN-01600

B137

19

ECM

B56 TCM

21

B56

B137

1 2 3 410 11 1219 20 21

135 614 15

7 8 916 17 1822 23 24

415

326

1815 167 8 9 10 11

17 19 2012 13

14

EN(H4SO)(diag)-226


2 CHECK ACCESSORY. Are car phone and/or CB installed on vehicle?

Repair grounding line of car phone or CB system.


Step Check Yes No

EN(H4SO)(diag)-227


BS:DTC P0865 TCM COMMUNICATION CIRCUIT LOW• DTC DETECTING CONDITION:



EN-01600

B137

19

ECM

B56 TCM

21

B56

B137

1 2 3 410 11 1219 20 21

135 614 15

7 8 916 17 1822 23 24

415

326

1815 167 8 9 10 11

17 19 2012 13

14

EN(H4SO)(diag)-228



TCM CONNECTOR.1)Turn the ignition switch to ON.2)Measure the voltage between ECM and chassis ground.


Is the voltage less than 1 V? Go to step 2. Even if malfunction indicator light lights up, the cir-cuit has returned to a normal condi-tion at this time.

NOTE:In this case, repairthe following:• Poor contact in ECM connector• Poor contact in TCM connector

2 CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from ECM and TCM.3)Measure the resistance of harness between ECM and chassis ground.



Go to step 3. Repair ground short circuit in har-ness between ECM and TCM connector.

3 CHECK OUTPUT SIGNAL FOR ECM.1)Connect the connector to ECM.2)Turn the ignition switch to ON.3)Measure the voltage between ECM and chassis ground.


Is the voltage more than 5 V? Go to step 4. Repair poor con-tact in ECM con-nector.

4 CHECK DTC FOR AUTOMATIC TRANSMIS-SION.Read the DTC for automatic transmission. <Ref. to 4AT(diag)-24, Read Diagnostic Trou-ble Code (DTC).>

Does the DTC appear for auto-matic transmission?

Check DTC for automatic trans-mission. <Ref. to 4AT(diag)-40, Diagnostic Proce-dure with Diagnos-tic Trouble Code (DTC).>


EN(H4SO)(diag)-229


BT:DTC P0866 TCM COMMUNICATION CIRCUIT HIGH• DTC DETECTING CONDITION:




TCM CONNECTOR.1)Turn the ignition switch to ON.2)Measure the voltage between ECM and chassis ground.


Is the voltage more than 10 V? Repair battery short circuit in har-ness between ECM and TCM connector.

Go to step 2.

EN-01600

B137

19

ECM

B56 TCM

21

B56

B137

1 2 3 410 11 1219 20 21

135 614 15

7 8 916 17 1822 23 24

415

326

1815 167 8 9 10 11

17 19 2012 13

14

EN(H4SO)(diag)-230


2 CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.Measure the voltage between ECM connector and chassis ground.



3 CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.Measure the voltage between ECM connector and chassis ground.


Is the voltage less than 1 V? Repair poor con-tact in ECM con-nector.

Go to step 4.

4 CHECK OUTPUT SIGNAL FROM ECM.Measure the voltage between ECM and chas-sis ground.


Is the voltage 1 — 4 V? Even if malfunction indicator light lights up, the cir-cuit has returned to a normal condi-tion at this time.

NOTE:In this case, repairthe following:• Poor contact in ECM connector• Poor contact in TCM connector



5 CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.Measure the voltage between TCM and chas-sis ground.


Is the voltage more than 4 V? Go to step 6. Repair open circuit in harness between ECM and TCM connector.




Check TCM power supply line and grounding line.

Step Check Yes No

EN(H4SO)(diag)-231


BU:DTC P1110 ATMOSPHERIC PRESSURE SENSOR CIRCUIT MALFUNCTION (LOW INPUT)



BV:DTC P1111 ATMOSPHERIC PRESSURE SENSOR CIRCUIT MALFUNCTION (HIGH INPUT)




the List of Diag-nostic Trouble Code (DTC). <Ref. to EN(H4SO)(diag)-74, List of Diag-nostic Trouble Code (DTC).>







EN(H4SO)(diag)-232


BW:DTC P1134 A/F SENSOR MICRO-COMPUTER PROBLEM• DTC DETECTING CONDITION:


CAUTION:After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-40, Inspection Mode.>.WIRING DIAGRAM:

EN-01421

B18

3 41 2

5 6

B47 F44

1 2 3 45 6 7 8

B136 B135

1234

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

SBF-5

EE

B47

B18

64

53

21

43 12

B2

3C

13

C2

2

C6

C1

7

C1

6C

58

B:

C:

B135

B136

B22

E3

ECM

BATTERY

B61 F44

2


MAIN RELAY

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHDLHD

RH

D

RH

D

EN(H4SO)(diag)-233






EN(H4SO)(diag)-234


BX:DTC P1137 O2 SENSOR CIRCUIT (LAMDA=1) (BANK1 SENSOR1)• DTC DETECTING CONDITION:


CAUTION:After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-40, OPERATION, Inspection Mode.>.WIRING DIAGRAM:



Go to step 2.

EN-01421

B18

3 41 2

5 6

B47 F44

1 2 3 45 6 7 8

B136 B135

1234

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

SBF-5

EE

B47

B18

64

53

21

43 12

B2

3C

13

C2

2

C6

C1

7

C1

6C

58

B:

C:

B135

B136

B22

E3

ECM

BATTERY

B61 F44

2


MAIN RELAY

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHDLHD

RH

D

RH

D

EN(H4SO)(diag)-235


2 CHECK FRONT OXYGEN (A/F) SENSOR DA-TA.1)Start the engine.2)While observing the Subaru Select Monitor or OBD-II general scan tool screen, warm-up the engine until coolant temperature is above 70°C (160°F).If the engine is already warmed-up, operate at idle speed for at least 1 minute.3)Read the data of front oxygen (A/F) sensor signal during idling using Subaru Select Moni-tor or OBD-II general scan tool.


Is the voltage 0.85 V — 1.15 V?


3 CHECK FRONT OXYGEN (A/F) SENSOR DA-TA.Race the engine at speeds from idling to 5,000 rpm for a total of 5 cycles.

NOTE:•Air fuel ratio is rich at normal condition or dur-ing racing.•To increase engine speed to 5,000 rpm, slowly depress accelerator pedal, taking approximately 5 seconds, and quickly release accelerator pedal to decrease engine speed.


4 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from ECM and front oxygen (A/F) sensor connector.3)Measure the resistance between ECM and front oxygen (A/F) sensor.

Connector & terminals(B136) No. 13 — (B18) No. 1:(B136) No. 22 — (B18) No. 2:


Go to step 5. Repair open circuit between ECM and front oxygen (A/F) sensor.

5 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR.Measure the resistance between ECM and chassis ground.

Connector & terminals(B136) No. 13 — Chassis ground:(B136) No. 22 — Chassis ground:


Go to step 6. Repair ground short circuit between ECM and front oxygen (A/F) sensor.


NOTE:Check the following items.•Loose installation of portions•Damage (crack, hole etc.) of parts•Looseness of front oxygen (A/F) sensor•Looseness and ill fitting of parts between front oxygen (A/F) sensor and rear oxygen sensor




Step Check Yes No

EN(H4SO)(diag)-236


BY:DTC P1492 EGR SOLENOID VALVE SIGNAL #1 CIRCUIT MALFUNCTION (LOW INPUT)

NOTE:For the diagnostic procedure, refer to DTC P1498. <Ref. to EN(H4SO)(diag)-238, DTC P1498 EGR SOLE-NOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with DiagnosticTrouble Code (DTC).>

BZ:DTC P1493 EGR SOLENOID VALVE SIGNAL #1 CIRCUIT MALFUNCTION (HIGH INPUT)

NOTE:For the diagnostic procedure, refer to DTC P1499. <Ref. to EN(H4SO)(diag)-240, DTC P1499 EGR SOLE-NOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with DiagnosticTrouble Code (DTC).>

CA:DTC P1494 EGR SOLENOID VALVE SIGNAL #2 CIRCUIT MALFUNCTION (LOW INPUT)


CB:DTC P1495 EGR SOLENOID VALVE SIGNAL #2 CIRCUIT MALFUNCTION (HIGH INPUT)


CC:DTC P1496 EGR SOLENOID VALVE SIGNAL #3 CIRCUIT MALFUNCTION (LOW INPUT)


CD:DTC P1497 EGR SOLENOID VALVE SIGNAL #3 CIRCUIT MALFUNCTION (HIGH INPUT)


EN(H4SO)(diag)-237


CE:DTC P1498 EGR SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT)


• TROUBLE SYMPTOM:• Erroneous idling• Poor driving performance.• Engine breathing


EN-01432

B137

B135

B134

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

EE

B47

E18

251436

B22B61 F44

E3

B328

E58

B22

E3

64

53

21 1

5A

17

A1

6A

15

A1

8

B2

1D

14

A7

4 36

15

16

SBF-5

BATTERY

MAIN RELAY

EGRVALVE

C1

9

A: B134

B: B135

C: B136

D: B137

ECM

B47

F44

E18

3 41 2

5 6

1 34 5 6

2

2

1 2 3 45 6 7 8

415

326

1815 167 8 9 10 11

17 19 2012 13

14

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

B328

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHD

RH

D

RH

D

LHD

MT

EN(H4SO)(diag)-238


Step Check Yes No1 CHECK POWER SUPPLY TO EGR SOLE-

NOID VALVE.1)Turn the ignition switch to OFF.2)Disconnect the connector from EGR sole-noid valve.3)Turn the ignition switch to ON.4)Measure the voltage between EGR solenoid valve connector and engine ground.



NOTE:In this case, repairthe following:• Open circuit in harness between EGR solenoid valve and main relay connector• Poor contact in coupling connector

2 CHECK HARNESS BETWEEN ECM AND EGR SOLENOID VALVE CONNECTOR.1)Turn the ignition switch to OFF.2)Measure the resistance between ECM and EGR solenoid valve connector.

Connector & terminalDTC P1492; (B134) No. 18 — (E18) No. 6:DTC P1494; (B134) No. 17 — (E18) No. 1:DTC P1496; (B134) No. 16 — (E18) No. 4:DTC P1498; (B134) No. 15 — (E18) No. 3:



NOTE:In this case, repairthe following:• Open circuit in harness between ECM and EGR solenoid valve connector• Poor contact in coupling connector

3 CHECK HARNESS BETWEEN ECM AND EGR SOLENOID VALVE CONNECTOR.1)Disconnect the connector from ECM.2)Measure the resistance between ECM con-nector and chassis ground.

Connector & terminalDTC P1492; (B134) No. 18 — Chassis ground:DTC P1494; (B134) No. 17 — Chassis ground:DTC P1496; (B134) No. 16 — Chassis ground:DTC P1498; (B134) No. 15 — Chassis ground:


Go to step 4. Repair ground short circuit in har-ness between ECM and EGR solenoid valve connector.

4 CHECK POOR CONTACT.Check poor contact in ECM connector and EGR solenoid valve connector.

Is there poor contact in ECM connector or EGR solenoid valve connector?

Repair poor con-tact in ECM con-nector or EGR solenoid valve connector.

Replace the EGR solenoid valve. <Ref. to FU(H4SO)-35, Idle Air Control Sole-noid Valve.>

EN(H4SO)(diag)-239


CF:DTC P1499 EGR SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (HIGH INPUT)


• TROUBLE SYMPTOM:• Erroneous idling• Poor driving performance.• Engine breathing


EN-01432

B137

B135

B134

B22

1 2 3 45 6 7 89 10 11 12

13 14 15 16

EE

B47

E18

251436

B22B61 F44

E3

B328

E58

B22

E3

64

53

21 1

5A

17

A1

6A

15

A1

8

B2

1D

14

A7

4 36

15

16

SBF-5

BATTERY

MAIN RELAY

EGRVALVE

C1

9

A: B134

B: B135

C: B136

D: B137

ECM

B47

F44

E18

3 41 2

5 6

1 34 5 6

2

2

1 2 3 45 6 7 8

415

326

1815 167 8 9 10 11

17 19 2012 13

14

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

B328

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

LHD

RH

D

RH

D

LHD

MT

EN(H4SO)(diag)-240


Step Check Yes No1 CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check the DTC

using the List of Diagnostic Trou-ble Code (DTC). <Ref. to EN(H4SO)(diag)-74, List of Diag-nostic Trouble Code (DTC).>

Go to step 2.

2 CHECK GROUND CIRCUIT FOR ECM.1)Turn the ignition switch to OFF.2)Measure the resistance between ECM con-nector and chassis ground.

Connector & terminal(B134) No. 7 — Chassis ground:(B137) No. 14 — Chassis ground:(B135) No. 21 — Chassis ground:(B136) No. 19 — Chassis ground: (MT model)



NOTE:In this case, repairthe following:• Open circuit in harness between ECM connector and engine ground terminal• Poor contact in ECM connector• Poor contact in coupling connector

3 CHECK HARNESS BETWEEN ECM AND EGR SOLENOID VALVE CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from EGR sole-noid valve.3)Turn the ignition switch to ON.4)Measure the voltage between ECM connec-tor and chassis ground.

Connector & terminalDTC P1493; (B134) No. 18 (+) — Chassis ground (–):DTC P1495; (B134) No. 17 (+) — Chassis ground (–):DTC P1497; (B134) No. 16 (+) — Chassis ground (–):DTC P1499; (B134) No. 15 (+) — Chassis ground (–):

Is the voltage more than 10 V? Repair battery short circuit in har-ness between ECM and EGR solenoid valve connector. After repair, replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>


EN(H4SO)(diag)-241


CG:DTC P1510 ISC SOLENOID VALVE SIGNAL #1 CIRCUIT MALFUNCTION (LOW INPUT)

NOTE:For the diagnostic procedure, refer to DTC P1516. <Ref. to EN(H4SO)(diag)-243, DTC P1516 ISC SOLE-NOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with DiagnosticTrouble Code (DTC).>

CH:DTC P1511 ISC SOLENOID VALVE SIGNAL #1 CIRCUIT MALFUNCTION (HIGH INPUT)

NOTE:For the diagnostic procedure, refer to DTC P1517. <Ref. to EN(H4SO)(diag)-245, DTC P1517 ISC SOLE-NOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with DiagnosticTrouble Code (DTC).>

CI: DTC P1512 ISC SOLENOID VALVE SIGNAL #2 CIRCUIT MALFUNCTION (LOW INPUT)


CJ:DTC P1513 ISC SOLENOID VALVE SIGNAL #2 CIRCUIT MALFUNCTION (HIGH INPUT)


CK:DTC P1514 ISC SOLENOID VALVE SIGNAL #3 CIRCUIT MALFUNCTION (LOW INPUT)


CL:DTC P1515 ISC SOLENOID VALVE SIGNAL #3 CIRCUIT MALFUNCTION (HIGH INPUT)


EN(H4SO)(diag)-242


CM:DTC P1516 ISC SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT)


• TROUBLE SYMPTOM:• Erroneous idling• Engine stalls.• Engine breathing


EN-02610

B137

B135

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

EE

B47

E7

251436

B22

E3

B21

E2

B22

E3

64

53

21 1

2A

6A

20

A1

9A

5

B2

1D

14

A7

4 13

15

16

SBF-5

BATTERY

MAIN RELAY

IDLEAIR CONTROL

SOLENOIDVALVE

C1

9

A: B134

B: B135 D: B137

ECM

B47

F44

E7

3 41 2

5 6

1 34 5 6

2

B21

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

1 2 3 45 6 7 8

415

326

1815 167 8 9 10 11

17 19 2012 13

14

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

B134

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

B61 F44

2LHD

RH

D

RH

D

LHD

MT

54 6 78

219

310

22 2311 12 13 14 15

24 25 26 2716 17 18

28 2919 20

21 30

B136

C: B136

A:

B:

D:

C:

EN(H4SO)(diag)-243


Step Check Yes No1 CHECK POWER SUPPLY TO IDLE AIR CON-

TROL SOLENOID VALVE.1)Turn the ignition switch to OFF.2)Disconnect the connector from idle air con-trol solenoid valve.3)Turn the ignition switch to ON.4)Measure the voltage between idle air control solenoid valve connector and engine ground.



NOTE:In this case, repairthe following:• Open circuit in harness between idle air control solenoid valve and main relay connec-tor• Poor contact in coupling connector

2 CHECK HARNESS BETWEEN ECM AND IDLE AIR CONTROL SOLENOID VALVE CONNECTOR.1)Turn the ignition switch to OFF.2)Measure the resistance between ECM and idle air control solenoid valve connector.

Connector & terminalDTC P1510; (B134) No. 20 — (E7) No. 4:DTC P1512; (B134) No. 6 — (E7) No. 1:DTC P1514; (B134) No. 5 — (E7) No. 6:DTC P1516; (B134) No. 19 — (E7) No. 3:



NOTE:In this case, repairthe following:• Open circuit in harness between ECM and idle air control solenoid valve connector• Poor contact in coupling connector

3 CHECK HARNESS BETWEEN ECM AND IDLE AIR CONTROL SOLENOID VALVE CONNECTOR.1)Disconnect the connector from ECM.2)Measure the resistance between ECM con-nector and chassis ground.

Connector & terminalDTC P1510; (B134) No. 20 — Chassis ground:DTC P1512; (B134) No. 6 — Chassis ground:DTC P1514; (B134) No. 5 — Chassis ground:DTC P1516; (B134) No. 19 — Chassis ground:


Go to step 4. Repair ground short circuit in har-ness between ECM and idle air control solenoid valve connector.

4 CHECK POOR CONTACT.Check poor contact in ECM connector and idle air control solenoid valve connector.

Is there poor contact in ECM connector or idle air control solenoid valve connector?

Repair poor con-tact in ECM con-nector or idle air control solenoid valve connector.

Replace the idle air control solenoid valve. <Ref. to FU(H4SO)-35, Idle Air Control Sole-noid Valve.>

EN(H4SO)(diag)-244


CN:DTC P1517 ISC SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (HIGH INPUT)


• TROUBLE SYMPTOM:• Erroneous idling• Engine stalls.• Engine breathing


EN-02610

B137

B135

B22

1 2 3 45 6 7 89 10 11 1213 14 15 16

EE

B47

E7

251436

B22

E3

B21

E2

B22

E3

64

53

21 1

2A

6A

20

A1

9A

5

B2

1D

14

A7

4 13

15

16

SBF-5

BATTERY

MAIN RELAY

IDLEAIR CONTROL

SOLENOIDVALVE

C1

9

A: B134

B: B135 D: B137

ECM

B47

F44

E7

3 41 2

5 6

1 34 5 6

2

B21

1 25 6 7 8

13 14 15 169 10 11 12

3 4

17 18 19 20

1 2 3 45 6 7 8

415

326

1815 167 8 9 10 11

17 19 2012 13

14

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

B134

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

B61 F44

2LHD

RH

D

RH

D

LHD

MT

54 6 78

219

310

22 2311 12 13 14 15

24 25 26 2716 17 18

28 2919 20

21 30

B136

C: B136

A:

B:

D:

C:

EN(H4SO)(diag)-245


Step Check Yes No1 CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check the DTC

using the List of Diagnostic Trou-ble Code (DTC). <Ref. to EN(H4SO)(diag)-74, List of Diag-nostic Trouble Code (DTC).>

Go to step 2.

2 CHECK GROUND CIRCUIT FOR ECM.1)Turn the ignition switch to OFF.2)Measure the resistance between ECM con-nector and chassis ground.

Connector & terminal(B134) No. 7 — Chassis ground:(B137) No. 14 — Chassis ground:(B135) No. 21 — Chassis ground:(B136) No. 19 — Chassis ground: (MT model)



NOTE:In this case, repairthe following:• Open circuit in harness between ECM connector and engine ground terminal• Poor contact in ECM connector• Poor contact in coupling connector

3 CHECK HARNESS BETWEEN ECM AND IDLE AIR CONTROL SOLENOID VALVE CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connector from idle air con-trol solenoid valve.3)Turn the ignition switch to ON.4)Measure the voltage between ECM connec-tor and chassis ground.

Connector & terminalDTC P1511; (B134) No. 20 (+) — Chassis ground (–):DTC P1513; (B134) No. 6 (+) — Chassis ground (–):DTC P1515; (B134) No. 5 (+) — Chassis ground (–):DTC P1517; (B134) No. 19 (+) — Chassis ground (–):

Is the voltage more than 10 V? Repair battery short circuit in har-ness between ECM and idle air control solenoid valve connector. After repair, replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>


EN(H4SO)(diag)-246


CO:DTC P1518 STARTER SWITCH CIRCUIT LOW INPUT• DTC DETECTING CONDITION:


• Failure of engine to start


EN(H4SO)(diag)-247


• WIRING DIAGRAM:

EN-02607

12

7

P R N D 3 2 1

SBF-4 SBF-1

B14

B72

12

11

T7T3B12

13

1

2

1

2

T7

1 2 3 4 5 67 8 9 10 11 12

B72

20

B136 ECM

: AT MODEL

: MT MODEL

1

2

B12

1 2 3 45 6 7 89 10 11 12

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

3 41 2

E

E

WS

WS

OS

OS

4

2

B323

B323

: WITH SECURITY EXCEPT FOR AUSTRALIA MODEL

: WITH SECURITY FOR AUSTRALIA MODEL AND WITHOUT SECURITY

WS

OS

IGNITIONSWITCH

BATTERY

INHIBITOR SWITCH

STARTERMOTOR

EN(H4SO)(diag)-248


Step Check Yes No1 CHECK OPERATION OF STARTER MOTOR.

Place the inhibitor switch in the “P” or “N” range. (AT model)Depress the clutch pedal. (MT model)

Does the starter motor operate when ignition switch is turned to “ST”?


NOTE:In this case, repairthe following:• Open or ground short circuit in har-ness between ECM and starter motor connector.• Poor contact in ECM connector.

Check starter motor circuit. <Ref. to EN(H4SO)(diag)-60, STARTER MOTOR CIR-CUIT, Diagnostics for Engine Start-ing Failure.>

EN(H4SO)(diag)-249


CP:DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION• DTC DETECTING CONDITION:




1)Turn the ignition switch to OFF.2)Measure the voltage between ECM and chassis ground.



Go to step 2.

EN-01444

B72

3 41 2

BATTERYIGNITIONSWITCH

MAIN RELAY

SBF-4 SBF-1

SBF-5

B72

B2

B1

C1

2C

16

B2

1

C5

A3

5A

7C

26

D1

4B

9

C1

0C

23

B47

E3

B22

12

35

64

ECM

EE

14

B134

B135

B136

A :

C :

D : B137

B :

C1

9

8 15 16

14

13

E

3 41 2

5 6

1 2 3 45 6 7 89 10 11 12

13 14 15 16

B137 B135B22B47

MT

F44

B134

1 2 3 45 6 7 8

1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20 21 22 2324 25 26 27 28 29 30 31 32 33 34 35

5 6 78

219

4310

2422 23 2511 12 13 14 15

26 27 2816 17 18 19

20 21

415

326

1815 167 8 9 10 11

17 19 2012 13

14

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

No.11

B61 F44

2LHD

RH

D

RH

D

LHD

EN(H4SO)(diag)-250


2 CHECK HARNESS BETWEEN ECM AND MAIN FUSE BOX CONNECTOR.1)Disconnect the negative terminal from bat-tery, and then disconnect the positive terminal.2)Disconnect the connector from ECM.3)Measure the resistance of harness between ECM and chassis ground.



Repair ground short circuit in har-ness between ECM connector and battery termi-nal.

Go to step 3.

3 CHECK FUSE SBF-5. Is the fuse blown out? Replace the fuse. Repair harness and connector.

NOTE:In this case, repairthe following:• Open circuit in harness between ECM and battery• Poor contact in ECM connector• Poor contact in battery terminal

Step Check Yes No

EN(H4SO)(diag)-251


CQ:DTC P1698 ENGINE TORQUE CONTROL CUT SIGNAL CIRCUIT LOW INPUT• DTC DETECTING CONDITION:



EN-00285

B136

15

ECM

B55 TCM

10

B55

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

1 2 3 410 11 1219 20 21

135 614 15

7 8 916 17 1822 23 24

EN(H4SO)(diag)-252



1)Start the engine, and warm-up the engine.2)Turn the ignition switch to OFF.3)Turn the ignition switch to ON.4)Measure the voltage between ECM and chassis ground.



Go to step 2.

2 CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from ECM and TCM.3)Measure the resistance of harness between ECM and chassis ground.




3 CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.Measure the resistance of harness between ECM and TCM connector.



Repair poor con-tact in ECM or TCM connector.

Repair open circuit in harness between ECM and TCM connector.

EN(H4SO)(diag)-253


CR:DTC P1699 ENGINE TORQUE CONTROL CUT SIGNAL CIRCUIT HIGH INPUT• DTC DETECTING CONDITION:



EN-00285

B136

15

ECM

B55 TCM

10

B55

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

1 2 3 410 11 1219 20 21

135 614 15

7 8 916 17 1822 23 24

EN(H4SO)(diag)-254



1)Start the engine, and warm-up the engine.2)Turn the ignition switch to OFF.3)Disconnect the connector from TCM.4)Turn the ignition switch to ON.5)Measure the voltage between ECM and chassis ground.


Is the voltage less than 3 V? Go to step 2. Repair battery short circuit in har-ness between ECM and TCM connector. After repair, replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>

2 CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.1)Turn the ignition switch to OFF.2)Measure the voltage between ECM and chassis ground.


Is the voltage more than 10 V by shaking the harness and connector of ECM?

Repair battery short circuit in har-ness between ECM and TCM connector. After repair, replace the ECM. <Ref. to FU(H4SO)-47, Engine Control Module (ECM).>



EN(H4SO)(diag)-255


CS:DTC P1711 ENGINE TORQUE CONTROL SIGNAL 1 CIRCUIT MALFUNC-TION


• TROUBLE SYMPTOM:• Excessive shift shock


EN-00286

B136

1

ECM

B56 TCM

5

B56

1 2 3 410 11 1219 20 21

135 614 15

7 8 916 17 1822 23 24

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

EN(H4SO)(diag)-256









Go to step 3.





4 CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from ECM and TCM.3)Measure the resistance of harness between ECM and TCM connector.



Go to step 5. Repair open circuit in harness between ECM and TCM connector.

5 CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.Measure the resistance of harness between ECM and chassis ground.








EN(H4SO)(diag)-257


CT:DTC P1712 ENGINE TORQUE CONTROL SIGNAL 2 CIRCUIT MALFUNCTION• DTC DETECTING CONDITION:


• Excessive shift shock


EN-00287

B136

18

ECM

B56 TCM

14

B56

B136

528

439

2320 2110 11

2216 17

24 2512 13

6

26191514

1718

1 2 3 410 11 1219 20 21

135 614 15

7 8 916 17 1822 23 24

EN(H4SO)(diag)-258









Go to step 3.





4 CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.1)Turn the ignition switch to OFF.2)Disconnect the connectors from ECM and TCM.3)Measure the resistance of harness between ECM and TCM connector.



Go to step 5. Repair open circuit in harness between ECM and TCM connector.

5 CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.Measure the resistance of harness between ECM and chassis ground.








EN(H4SO)(diag)-259

ENGINE (DIAGNOSTICS)General Diagnostic Table

20.General Diagnostic TableA: INSPECTION1. ENGINE

NOTE:Malfunction of parts other than those listed is also possible. <Ref. to ME(H4SO)-89, Engine Trouble in Gen-eral.>

Symptom Problem parts

1. Engine stalls during idling.

1) Idle air control solenoid valve 2) Manifold absolute pressure sensor3) Intake air temperature sensor4) Ignition parts (*1) 5) Engine coolant temperature sensor (*2) 6) Crankshaft position sensor (*3) 7) Camshaft position sensor (*3) 8) Fuel injection parts (*4)

2. Rough idling

1) Idle air control solenoid valve 2) Manifold absolute pressure sensor3) Intake air temperature sensor4) Engine coolant temperature sensor (*2) 5) Ignition parts (*1) 6) Air intake system (*5) 7) Fuel injection parts (*4) 8) Throttle position sensor 9) Crankshaft position sensor (*3) 10) Camshaft position sensor (*3) 11) Oxygen sensor 12) Fuel pump and fuel pump relay

3. Engine does not return to idle.

1) Idle air control solenoid valve 2) Engine coolant temperature sensor 3) Accelerator cable (*6) 4) Throttle position sensor5) Manifold absolute pressure sensor6) Intake air temperature sensor

4. Poor acceleration

1) Manifold absolute pressure sensor2) Intake air temperature sensor3) Throttle position sensor 4) Fuel injection parts (*4) 5) Fuel pump and fuel pump relay 6) Engine coolant temperature sensor (*2) 7) Crankshaft position sensor (*3) 8) Camshaft position sensor (*3) 9) A/C switch and A/C cut relay 10) Engine torque control signal circuit 11) Ignition parts (*1)

5. Engine stalls or engine sags or hesitates at acceleration.

1) Manifold absolute pressure sensor2) Intake air temperature sensor3) Engine coolant temperature sensor (*2) 4) Crankshaft position sensor (*3) 5) Camshaft position sensor (*3) 6) Purge control solenoid valve 7) Fuel injection parts (*4) 8) Throttle position sensor 9) Fuel pump and fuel pump relay

EN(H4SO)(diag)-260


*1: Check ignition coil & ignitor ASSY and spark plug. *2: Indicate the symptom occurring only in cold temperatures. *3: Ensure the secure installation. *4: Check fuel injector, fuel pressure regulator and fuel filter. *5: Inspect air leak in air intake system. *6: Adjust accelerator cable.

2. AUTOMATIC TRANSMISSION

NOTE:Check general diagnostics table with non-conformity symptom for automatic transmission. <Ref. to 4AT(di-ag)-2, Basic Diagnostic Procedure.>

6. Surge

1) Intake manifold pressure sensor2) Intake air temperature sensor3) Manifold absolute pressure sensor4) Engine coolant temperature sensor (*2) 5) Crankshaft position sensor (*3) 6) Camshaft position sensor (*3) 7) Fuel injection parts (*4) 8) Throttle position sensor 9) Fuel pump and fuel pump relay

7. Spark knock

1) Intake manifold pressure sensor2) Intake air temperature sensor3) Manifold absolute pressure sensor4) Engine coolant temperature sensor 5) Knock sensor 6) Fuel injection parts (*4) 7) Fuel pump and fuel pump relay

8. After burning in exhaust system

1) Intake manifold pressure sensor2) Intake air temperature sensor3) Manifold absolute pressure sensor4) Engine coolant temperature sensor (*2) 5) Fuel injection parts (*4) 6) Fuel pump and fuel pump relay

Symptom Problem parts

EN(H4SO)(diag)-261


EN(H4SO)(diag)-262

Documents

2004 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX … · sensor connector. 4 CHECK FRONT OXYGEN (A/F) SENSOR. Measure the resistance between front oxygen (A/F) sensor connector terminals