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88A_PDF.bookABS (DIAGNOSTICS) BASIC DIAGNOSTIC PROCEDURE
1. Basic Diagnostic Procedure A: PROCEDURE 1. WITHOUT SUBARU SELECT MONITOR
CAUTION: Remove foreign matter (dust, water, etc.) from the ABSCM&H/U connector during removal and instal- lation.
NOTE: • To check the harness for broken wires or short circuits, shake it while holding it or the connector. • When the ABS warning light illuminates, read and record the diagnostic trouble code (DTC) indicated by ABS warning light.
Step Value Yes No 1 CHECK PRE-INSPECTION.
1)Ask the customer when and how trouble occurred using interview checklist. <Ref. to ABS-6, Check List for Interview.> 2)Before performing diagnosis, inspect the unit which might influence ABS problem. <Ref. to ABS-10, INSPECTION, General Description.> Is the unit that might influence the ABS prob- lem normal?
Unit is normal. Go to step 2. Repair or replace each unit.
2 CHECK INDICATION OF DIAGNOSTIC TROUBLE CODE (DTC). Calling up the DTC. <Ref. to ABS-21, Read Diagnostic Trouble Code (DTC).> Is the ABS warning light normal?
ABS warning light is normal. Go to step 3. Inspect using diag- nostic chart for ABS warning light failure.<Ref. to ABS-29, Diagnos- tics Chart with Diagnosis Con- nector.>
NOTE: Call up DTC again after inspecting ABS warning light. <Ref. to ABS-21, Read Diagnostic Trouble Code (DTC).>
3 CHECK DIAGNOSTIC TROUBLE CODE (DTC). Record all DTCs. Is only the start code issued?
Only the start code is issued. Go to step 4. Go to step 5.
4 PERFORM THE GENERAL DIAGNOSTICS. 1)Inspect using “General Diagnostics Table”. <Ref. to ABS-175, General Diagnostics Table.> 2)Perform the clear memory mode. <Ref. to ABS-23, WITHOUT SUBARU SELECT MONI- TOR, OPERATION, Clear Memory Mode.> 3)Perform the inspection mode. <Ref. to ABS- 22, Inspection Mode.> Calling up the DTC. <Ref. to ABS-21, Read Diagnostic Trouble Code (DTC).> Is only the start code issued?
Only the start code is issued. Complete the diagnosis.
Go to step 5.
5 PERFORM THE DIAGNOSIS. 1)Repair trouble cause.
NOTE: For DTC list, refer to “List of Diagnostics Trou- ble Code (DTC)”.<Ref. to ABS-25, WITHOUT SUBARU SELECT MONITOR, LIST, List of Di- agnostics Trouble Code (DTC).>
2)Perform the clear memory mode. <Ref. to ABS-23, WITHOUT SUBARU SELECT MONI- TOR, OPERATION, Clear Memory Mode.> 3)Perform the inspection mode. <Ref. to ABS- 22, Inspection Mode.> 4)Calling up the DTC. <Ref. to ABS-21, Read Diagnostic Trouble Code (DTC).> Is only the start code issued?
Only the start code is issued. Complete the diagnosis.
Repeat the step5 until only start code is issued.
Step Value Yes No
ABS (DIAGNOSTICS) BASIC DIAGNOSTIC PROCEDURE
2. WITH SUBARU SELECT MONITOR
CAUTION: Remove foreign matter (dust, water, etc.) from the ABSCM&H/U connector during removal and instal- lation.
NOTE: • To check the harness for broken wires or short circuits, shake it while holding it or the connector. • Check list for interview. <Ref. to ABS-6, Check List for Interview.>
Step Value Yes No 1 CHECK PRE-INSPECTION.
1)Ask the customer when and how trouble occurred using interview checklist. <Ref. to ABS-6, Check List for Interview.> 2)Before performing diagnosis, inspect the unit which might influence the ABS problem. <Ref. to ABS-10, INSPECTION, General Descrip- tion.> Is the unit that might influence the ABS prob- lem normal?
Unit is normal. Go to step 2. Repair or replace each unit.
2 CHECK INDICATION OF DIAGNOSTIC TROUBLE CODE (DTC) DISPLAY. 1)Turn the ignition switch to OFF. 2)Connect the SUBARU SELECT MONITOR to data link connector. 3)Turn the ignition switch to ON and SUBARU SELECT MONITOR to ON.
NOTE: If the communication function of select monitor cannot be executed normally, check communi- cation circuit. <Ref. to ABS-95, COMMUNICA- TION FOR INITIALIZING IMPOSSIBLE, Diagnostics Chart with Subaru Select Monitor.> 4)Read the DTC. <Ref. to ABS-19, READ CURRENT DATA, OPERATION, Subaru Select Monitor.> 5)Record all DTCs and frame data. Is DTC displayed?
DTC is not displayed. Go to step 3. Go to step 4.
3 PERFORM THE GENERAL DIAGNOSTICS. 1)Inspect using “General Diagnostics Table”. <Ref. to ABS-175, General Diagnostics Table.> 2)Perform the clear memory mode. <Ref. to ABS-19, CLEAR MEMORY MODE, OPERA- TION, Subaru Select Monitor.> 3)Perform the inspection mode. <Ref. to ABS- 22, Inspection Mode.> 4)Calling up the DTC. <Ref. to ABS-18, READ DIAGNOSTIC TROUBLE CODE (DTC), OPERATION, Subaru Select Monitor.> Check DTC is not displayed. Is the ABS warning light turned off?
ABS warning light is turned off. Complete the diagnosis.
Go to step 4.
ABS (DIAGNOSTICS) BASIC DIAGNOSTIC PROCEDURE
4 PERFORM THE DIAGNOSIS. 1)For DTC list, refer to “List of Diagnostics Trouble Code (DTC)”.<Ref. to ABS-27, WITH SUBARU SELECT MONITOR, LIST, List of Diagnostics Trouble Code (DTC).> 2)Repair trouble cause. 3)Perform the clear memory mode. <Ref. to ABS-19, CLEAR MEMORY MODE, OPERA- TION, Subaru Select Monitor.> 4)Perform the inspection mode. <Ref. to ABS- 22, Inspection Mode.> 5)Calling up the DTC. <Ref. to ABS-18, READ DIAGNOSTIC TROUBLE CODE (DTC), OPERATION, Subaru Select Monitor.> Check DTC is not displayed. Is the ABS warning light turned off?
ABS warning light is turned off. Complete the diagnosis.
Inspect using “Diagnostics Chart with Subaru Select Monitor”. <Ref. to ABS-95, Diagnos- tics Chart with Subaru Select Monitor.>
Step Value Yes No
ABS (DIAGNOSTICS) CHECK LIST FOR INTERVIEW
2. Check List for Interview A: CHECK Check the following items about the vehicle's state.
1. STATE OF ABS WARNING LIGHT
2. STATE OF BRAKE WARNING LIGHT
ABS warning light comes on.
Always Sometimes Only once Does not come on • When / how long does it come on?:
Ignition key position LOCK ACC ON (before starting engine) START On after starting (Engine is running) On after starting (Engine is stop)
Timing Immediately after ignition is ON. Immediately after ignition starts.
When advancing km/h to km/h
MPH to MPH
When decelerating km/h to km/h
MPH to MPH
Steering time : sec
Steering time : sec
• Parts name : • Operating condition :
Brake warning light comes on.
Always Sometimes Only once Does not come on When parking brake lever is pulled When parking brake lever is released • When / how long does it come on?:
Ignition key position LOCK ACC ON (before starting engine) START On after starting (Engine is running) On after starting (Engine is stop)
ABS-6
3. SYMPTOMS
Timing Immediately after ignition is ON. Immediately after ignition starts.
When advancing km/h to km/h
MPH to MPH
When decelerating km/h to km/h
MPH to MPH
Steering time : sec
Steering time : sec
• Parts name : • Operating condition :
ABS operating condi- tion
MPH
a) Operating time : sec
b) Operating noise : Produce / Does not produce
• What kind of noise? Knock Gong gong Bong Buzz Gong gong buzz Others :
c) Reaction force of brake pedal
Stick Press down once with a clunk Press and released Others :
ABS-7
ABS (DIAGNOSTICS) CHECK LIST FOR INTERVIEW
Behavior of vehicle a) Directional stability cannot be obtained or steering refuses to work when applying brakes : Yes / No
• When : Vehicle turns to right Vehicle turns to left Spins Others :
b) Directional stability cannot be obtained or steering refuses to work when accelerating : Yes / No
• When : Vehicle turns to right Vehicle turns to left Spins Others :
c) Brakes out of order : Yes / No
• What : Braking distance is long Brakes lock or drag Pedal stroke is long Pedal sticks Others :
d) Poor acceleration : Yes / No
• What : Fails to accelerate Engine stalls Others :
e) Occurrence of vibration : Yes / No
• Where • What kind :
• Where • What kind :
• What kind :
Environment a) Weather Fine Cloudy Rainy Snowy Various/Others :
b) Ambient temperature °F (°C)
c) Road Urban area Suburbs Highway General road Ascending slope Descending slope Paved road Gravel road Muddy road Sandy place Others :
d) Road surface Dry Wet New-fallen snow Compressed snow Frozen slope Others :
Condition a) Brakes Deceleration : g
Continuous / Intermittent
Advancing Accelerating Reducing speed Low speed Turning Others :
d) Tire inflation pressure Front RH tire : kPa
Front LH tire : kPa
Rear RH tire : kPa
Rear LH tire : kPa
Front LH tire :
Rear RH tire :
Rear LH tire :
g) Chain is passed around tires. : Yes / No
h) T tire is used. : Yes / No
i) Condition of suspension alignment :
j) Loading state :
• What :
ABS (DIAGNOSTICS) GENERAL DESCRIPTION
3. General Description A: CAUTION 1. SUPPLEMENTAL RESTRAINT SYSTEM “AIRBAG” Airbag system wiring harness is routed near the ABS sensor, ABS control module and hydraulic control unit.
CAUTION: • All airbag system wiring harness and con- nectors are colored yellow. Do not use electri- cal test equipment on these circuit. • Be careful not to damage the airbag system wiring harness when servicing the ABS sensor, ABS control module and hydraulic control unit.
B: INSPECTION Before performing diagnostics, check the following items which might affect ABS problems:
1. BATTERY Measure the battery voltage and specific gravity of electrolyte.
Standard voltage: 12 V, or more
Specific gravity: Above 1.260
2. BRAKE FLUID 1) Check the brake fluid level. 2) Check the brake fluid leakage.
3. HYDRAULIC UNIT Check the hydraulic unit. • With brake tester <Ref. to ABS-9, CHECKING THE HYDRAULIC UNIT ABS OPERATION WITH BRAKE TESTER, INSPECTION, ABS Control Module and Hydraulic Control Unit (ABSCM&H/ U).> • Without brake tester <Ref. to ABS-8, CHECK- ING THE HYDRAULIC UNIT ABS OPERATION BY PRESSURE GAUGE, INSPECTION, ABS Control Module and Hydraulic Control Unit (AB- SCM&H/U).>
4. BRAKE DRAG Check for brake drag.
5. BRAKE PAD AND ROTOR Check the brake pad and rotor. • Front <Ref. to BR-19, INSPECTION, Front Brake Pad.> and <Ref. to BR-20, INSPECTION, Front Disc Rotor.> • Rear <Ref. to BR-24, INSPECTION, Rear Brake Pad.> and <Ref. to BR-25, INSPECTION, Rear Disc Rotor.> or <Ref. to BR-30, INSPECTION, Rear Drum Brake Shoe.> and <Ref. to BR-31, IN- SPECTION, Rear Drum Brake Drum.>
6. TIRE Check the tire specifications, tire wear and air pres- sure. <Ref. to WT-2, SPECIFICATIONS, General Description.>
ABS-10
2. GENERAL PURPOSE TOOLS
24082AA210 CARTRIDGE Troubleshooting for electrical systems.
22771AA030 SUBARU SELECT MONITOR KIT
Troubleshooting for electrical systems.
Oscilloscope Used for measuring sensor.
ST24082AA210
ST22771AA030
ABS-11
4. Electrical Components Location A: LOCATION
(1) ABS control module and hydraulic control unit (ABSCM&H/U)
(6) Transmission control module (AT vehicles only)
(11) Stop light switch
(12) Master cylinder
(2) Proportioning valve (without EBD) (7) Tone wheel (13) Brake warning light
(3) Diagnosis connector (8) ABS sensor
(4) ABS warning light (9) Wheel cylinder
(5) Data link connector (for Subaru Select Monitor)
(10) G sensor
ABS00101
(4)
(13)
ABS00177
5. Control Module I/O Signal A: ELECTRICAL SPECIFICATION
NOTE: • The terminal numbers in ABS control module and hydraulic control unit connector are as shown in the fig- ure. • When the connector is removed from ABSCM&H/U, the connector switch closes the circuit between ter- minal No. 22 and No. 23. The ABS warning light illuminates.
(1) ABS control module and hydraulic control unit connector
(2) Connector switch
ABS00182
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
27 28 29 30 31 23 24 25 26
F49B301 or
ABS (DIAGNOSTICS) CONTROL MODULE I/O SIGNAL
*1: Measure the I/O signal voltage after removing the connector from the ABSCM&H/U terminal. *2: Measure the I/O signal voltage at connector (B98), (B37) ,(B38), (F48) or (F103).
Contents Terminal No.
ABS sensor*2 (Wheel speed sensor)
Front left wheel 9 — 10
0.12 — 1 V (When it is 20 Hz.)
Front right wheel 11 — 12
Rear left wheel 7 — 8
Rear right wheel 14 — 15
Valve relay power supply*1 24 — 23 10 — 15 V
Motor relay power supply*1 25 — 23 10 — 15 V
G sensor*2
Ground 28 —
Output 6 — 28 2.1 — 2.5 V when vehicle is in horizontal position.
Stop light switch*1 2 — 23 Less than 1.5 V when the stop light is OFF and, 10 — 15 V
when the stop light is ON.
ABS warning light*2 22 — 23 Less than 1.5 V within 1.5 seconds immediately after ignition switch has been turned to ON, and 10 — 15 V after 1.5 sec-
onds has elapsed.
Brake warning light*2 (EBD warning light)
21 — 23 Less than 1.5 V within 1.5 seconds immediately after ignition switch has been turned to ON, and 10 — 15 V after 1.5 sec-
onds has elapsed.
AT ABS signal (AT vehicles only)
31 — 23 Less than 1.5 V when the ABS control still operates and more
than 5.5 V when ABS does not operate.
ABS operation signal monitor 3 — 23 Less than 1.5 V when the ABS control still operates and more
than 5.5 V when ABS does not operate.
Select monitor*2 Data is received. 20 — 23 Less than 1.5 V when no data is received.
Data is sent. 5 — 23 4.75 — 5.25 V when no data is sent.
ABS diagnosis connec- tor
Terminal No. 3 29 — 23 10 — 15 V when ignition switch is ON.
Terminal No. 6 4 — 23 10 — 15 V when ignition switch is ON.
Power supply*1 1 — 23 10 — 15 V when ignition switch is ON.
Grounding line 23 —
Grounding line 26 —
B: SCHEMATIC
(1) Battery (10) Front inlet solenoid valve RH (19) Brake warning light
(2) IGN (11) Front outlet solenoid valve RH (20) ABS warning light
(3) ABS control module and hydraulic control unit (ABSCM&H/U)
(12) Rear inlet solenoid valve LH (21) Stop light switch
(13) Rear outlet solenoid valve LH (22) Stop light
(4) ABS control module area (14) Rear inlet solenoid valve RH (23) G sensor
(5) Valve relay (15) Rear outlet solenoid valve RH (24) Front ABS sensor LH
(6) Motor relay (16) Transmission control module (AT vehicles only)
(25) Front ABS sensor RH
(7) Motor (26) Rear ABS sensor LH
(8) Front inlet solenoid valve LH (17) Diagnosis connector (27) Rear ABS sensor RH
(9) Front outlet solenoid valve LH (18) Data link connector
ABS00109
ABS-16
C: WAVEFORM
ABS (DIAGNOSTICS) SUBARU SELECT MONITOR
6. Subaru Select Monitor A: OPERATION 1. READ DIAGNOSTIC TROUBLE CODE (DTC) 1) Prepare the Subaru Select Monitor kit.
2) Connect the diagnosis cable to Subaru Select Monitor. 3) Insert the cartridge into Subaru Select Monitor. <Ref. to ABS-11, SPECIAL TOOLS, PREPARA- TION TOOL, General Description.>
4) Connect the Subaru Select Monitor to data link connector.
(1) Data link connector located in the lower por- tion of instrument panel (on the driver's side).
(2) Connect the diagnosis cable to data link connector.
CAUTION: Do not connect the scan tools except for Suba- ru Select Monitor and OBD-II general scan tool. 5) Turn the ignition switch to ON (engine OFF) and Subaru Select Monitor switch to ON.
6) On the «Main Menu» display screen, select the {Each System Check} and press [YES] key. 7) On the «System Selection Menu» display screen, select the {Brake Control System} and press [YES] key. 8) Press the [YES] key after displayed information of engine type. 9) On the «ABS Diagnosis» display screen, select the {Diagnostic Code(s) Display} and press [YES] key. 10) On the «Diagnostic Code(s) Display» display screen, select the {Current Diagnostic Code(s)} or {History Diagnostic Code(s)} and press [YES] key.
NOTE: • For detailed operation procedure, refer to the SUBARU SELECT MONITOR OPERATION MAN- UAL. • For detailed concerning the DTC, refer to the LIST OF DIAGNOSTICS TROUBLE CODE (DTC). <Ref. to ABS-25, List of Diagnostics Trouble Code (DTC).> • A maximum of 3 DTCs are displayed in order of occurrence. • If a particular DTC is not properly stored in mem- ory (due to a drop in ABSCM&H/U power supply, etc.) when a problem occurs, the DTC, followed by a question mark “?”, appears on the Subaru Select Monitor display. This shows it may be an unreliable reading.
(1) Data link connector
ABS (DIAGNOSTICS) SUBARU SELECT MONITOR
2. READ CURRENT DATA 1) On the «Main Menu» display screen, select the {Each System Check} and press «YES» key. 2) On the «System Selection Menu» display screen, select the {Brake Control System} and press «YES» key. 3) Press the «YES» key after displayed the information of ABS type. 4) On the «Brake Control Diagnosis» display screen, select the {Current Data Display & Save} and press «YES» key. 5) On the «Data Display Menu» display screen, select the {Data Display} and press «YES» key. 6) Using the scroll key, move the display screen up or down until desired data is shown. • A list of the support data is shown in the following table.
NOTE: For detailed operation procedure, refer to the SUBARU SELECT MONITOR OPERATION MANUAL.
3. CLEAR MEMORY MODE 1) On the «Main Menu» display screen, select the {2. Each System Check} and press «YES» key. 2) On the «System Select Menu» display screen, select the {Brake System} and press «YES» key. 3) Press the «YES» key after displayed the infor- mation of engine type. 4) On the «Brake Control Diagnosis» display screen, select the {Clear Memory} and press «YES» key.
5) When the “Done” and “turn ignition switch to OFF” are shown on display screen, turn the Subaru Select Monitor and ignition switch to OFF.
NOTE: For detailed operation procedure, refer to the SUB- ARU SELECT MONITOR OPERATION MANUAL.
4. ABS SEQUENCE CONTROL
Latest The most recent DTC appears on select monitor display.
Old The second most recent DTC appears on select monitor display.
Older The third most recent DTC appears on select monitor display.
Reference DTC issued after elapse of a specified period of time.
Display screen Contents to be monitored Unit of measure
FR Wheel Speed Wheel speed detected by Front ABS sensor RH is displayed km/h or MPH
FL Wheel Speed Wheel speed detected by Front ABS sensor LH is displayed km/h or MPH
RR Wheel Speed Wheel speed detected by Rear ABS sensor RH is displayed km/h or MPH
RL Wheel Speed Wheel speed detected by Rear ABS sensor LH is displayed km/h or MPH
Stop Light Switch Stop light switch signal ON or OFF
Stop Light Switch Stop light switch monitor voltage is displayed. V
G sensor output Signal Voltage equivalent to vehicle acceleration detected by analog G sensor is displayed.
V
Valve Relay Signal Valve Relay Signal ON or OFF
Motor Relay Signal Motor Relay Signal ON or OFF
ABS Signal to TCM ABS operation signal from ABS control module to TCM ON or OFF
ABS Warning Lamp ON operation of ABS warning light is displayed. ON or OFF
EBD warning light ON operation of EBD warning light is displayed. ON or OFF
Motor Relay Monitor Operating condition of motor relay is displayed. ON or OFF
Valve Relay Monitor Operating condition of the valve relay is displayed. ON or OFF
CCM Signal ABS operation signal from ABS control module to TCM ON or OFF
Display screen Contents to be monitored
Clear memory? Function of clearing DTC and freeze frame data.
Display screen
ABS sequence control
Perform ABS sequence control by operating valve and pump motor sequen- tially.
<Ref. to ABS- 11, ABS Sequence Con- trol.>
ABS-19
5. FREEZE FRAME DATA
NOTE: • Data stored at the time of trouble occurrence is shown on display. • Each time trouble occurs, the latest information is stored in the freeze frame data in memory. • Freeze frame data will be memorized maximum to three. • If freeze frame data is not properly stored in memory (due to a drop in ABSCM power supply, etc.), a DTC, preceded by a question mark “?”, ap- pears on the…