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CAT 3126 Eletric Diagrama

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Inlet Air Heater

TOP VIEWInlet Air Heater Lamp Connector P40 Intake Manifold Air Temperature Sensor

Boost Pressure Sensor

Unit Injector Cylinder #6

Coolant Temperature Sensor 1 2 3 4 5 6

High Pressure Pump Engine Oil Temperature Sensor Injection Actuation Pressure Sensor

Injector Harness Grommet Electronic Control Module (ECM) Timing Calibration Probe Connector J24/P24

Injection Actuation Pressure Control Valve (IAPCV)

1BW1-UP

3126 Truck Engine Electrical SystemSENR9628 November 2001

2001 Caterpillar All Rights ReservedHigh Pressure Pump* *

Injection Actuation Pressure Control Valve (IAPCV)

Engine Oil Temperature Sensor

Injection Actuation Pressure Sensor

Intake Manifold Air Temperature Sensor

Injector Harness Grommet

Top Speed/Timing Sensor

Ground Stud

Timing Calibration Probe Connector J24/P24

Bottom Speed/Timing Sensor

Printed in U.S.A.

ECM Ground Strap

Electronic Control Module (ECM) ECM Vehicle Harness Connector J1/P1

LEFT SIDE VIEW

ECM Engine Harness Connector J2/P2

INJECTOR HARNESS GROMMETA B A701-GY A721-WH A B A702-PU A722-YL

P2 J2 A701-GY A721-WH A702-PU A722-YL A703-BR A723-OR A704-GN A724-WH A705-BU A725-YL A706-GY A726-OR D784-BU D810-PU D811-YL D785-GN D797-PK D798-BK E963-BK E964-WH 6 5 12 11 18 17 22 21 28 27 34 33 40 39 4 10 19 13 1 8 9 37 29 25 15 3 23 24 14 2 32 7 16 26 30 36 38 20 35 31

ELECTRONIC CONTROL MODULE (ECM)INJECTOR 1 INJECTOR COMMON 1 INJECTOR 2 INJECTOR COMMON 2 INJECTOR 3 INJECTOR COMMON 3 INJECTOR 4 INJECTOR COMMON 4 INJECTOR 5 INJECTOR COMMON 5 INJECTOR 6 INJECTOR COMMON 6 VEHICLE SPEED OUT+ VEH SP IN+/TDC PROBE+ VEH SP IN-/TDC PROBEVEHICLE SPEED OUTINJ ACTUATION PRESS. CONT VALVE IAP CONT VALVE COMMON ENG SP/TMG #1ENG SP/TMG #1+

J29 P29

J30 P30 CYL NO.1

A B

A703-BR A723-OR

J31 P31 CYL NO.2

A B

A704-GN A724-WH

J32 P32 CYL NO.3

A B

A705-BU A725-YL

J33 P33 CYL NO.4

A B

A706-GY A726-OR TIMING CALIBRATION PROBE CONNECTOR A D797-PK B D798-BK J36 P36

J34 P34 CYL NO.5

J24 P24 1 2

CYL NO.6 A B P9 A B P4 E965-BU E966-YL E963-BK E964-WH

INJECTION ACTUATION PRESSURE CONTROL VALVE

TOP SPEED/TIMING SENSOR

ENGINE SPEED / TIMING ENGINE SPEED / TIMING + J9

BOTTOM SPEED/TIMING SENSOR

ENGINE SPEED / TIMING ENGINE SPEED / TIMING + J4

E965-BU E966-YL A746-PK D841-GN 995-BU C967-BU E795-YL

ENG SP/TMG #2ENG SP/TMG #2+ BOOST PRESSURE INJ ACTUATION PRESS. COOLANT TEMP INTAKE MANF AIR TEMP OIL TEMP

BOOST PRESSURE SENSOR

BOOST PRESSURE SENSOR COMMON +5V

GN YL OR

C A746-PK B 993-BR A 997-OR P3 J3

993-BR 997-OR

SENSOR COMMON +5V

INJECTION ACTUATION PRESSURE SENSOR

D796-OR INJ ACTUATION PRESS. SENSOR COMMON +5V GN YL OR C B A D841-GN 993-BR 997-OR

INLET AIR HEATER

P35 J35

COOLANT TEMPERATURE SENSOR

COOLANT TEMP SENSOR COMMON +5V

WH BK OR

C B A J10 P10

995-BU 993-BR 997-OR

INTAKE MANIFOLD AIR TEMPERATURE SENSOR

INTAKE MANF AIR TEMP SENSOR COMMON +5V

WH BK OR

C B A J21 P21

C967-BU 993-BR 997-OR

INLET AIR HEATER RELAY J37 P37 D812-RD 1 D796-OR 2 N/O D812-RD D796-OR

(+) BATTERY SUPPLY WIRES INPUT SIGNAL WIRES TO ECM OUTPUT SIGNAL WIRES FROM ECM SENSOR SUPPLY VOLTAGE SIGNAL PLUS SIGNAL MINUS (-) BATTERY / SENSOR RETURN

ENGINE OIL TEMPERATURE SENSOR

ENGINE OIL TEMP SENSOR COMMON +5V

WH BK OR

C B A J51 P51

E795-YL 993-BR 997-OR

INLET AIR HEATER

TO +BATTERY

TO ENGINE CYL HEAD (NOT CYL HEAD GND STUD) INLET AIR HEATER GROUND STRAP

469 468 469 468

LAV B A B A APC

P40 B D796-OR A D812-RD CONNECTED TO LAV HARNESS OR APC HARNESS

ECM GND STRAP TO ECM MOUNTING BOLT

TO POWER PACK INTERFACE

C B K L M N P R S T U V W X Y Z E A A F B C D D E F G H J

C B K L M N P R S T U V W X Y Z E A A F B C D D E F G H J

469 468

LAV INTERFACE HARNESS570 571 572 573 574 575 89 577 578 586 585 579 581 580 581 580 35 30 37 40 38 14 2 29 22 7 1 18 5 28 4 6 3 8 9 10 11 12 13 15 16 17 19 20 21 23 24 25 26 27 31 32 33 34 36 39 P6 +8V MULTI-FUNCTION SENSOR COMMON THROTTLE POSITION EXHAUST BRAKE XMSN NEUTRAL SW SERVICE BRAKE SW #1 FAST IDLE ENABLE SW SENSOR COMMON CHECK ENGINE LAMP ATA DATA LINK+ (J1587) ATA DATA LINK- (J1587) VEHICLE SPEED IN+ -BATTERY +BATTERY -BATTERY +BATTERY

TO VEHICLE COMPONENTS

FROM (J1) ELECTRONIC CONTROL MODULE (ENGINE)

J2 P1

ENGINE BULKHEAD

TO POWER PACK INTERFACE J1

C B K L M N P R S T U V W X Y Z e A a f b c D d E F G H J

C B K L M N P R S T U V W X Y Z e A a f b c D d E F G H J

469 468

APC INTERFACE HARNESS570 571 572 573 574 575 576 577 578 142 151 579 581 580 581 580 35 30 37 40 38 14 2 29 22 7 1 18 5 28 4 6 3 8 9 10 11 12 13 15 16 17 19 20 21 23 24 25 26 27 31 32 33 34 36 39 P1 J1 +8V MULTI-FUNCTION SENSOR COMMON THROTTLE POSITION EXHAUST BRAKE XMSN NEUTRAL SW SERVICE BRAKE SW #1 FAST IDLE ENABLE SW SENSOR COMMON CHECK ENGINE LAMP ATA DATA LINK+ (J1587) ATA DATA LINK- (J1587) VEHICLE SPEED IN+ -BATTERY +BATTERY -BATTERY +BATTERY 35 30 37 40 38 14 2 29 22 7 1 18 5 28 4 6 3 8 9 CONNECTED TO 10 LAV HARNESS OR 11 APC HARNESS 12 13 15 16 17 19 20 21 23 24 25 26 27 31 32 33 34 36 39 J1 +8V MULTI-FUNCTION SENSOR COMMON THROTTLE POSITION EXHAUST BRAKE XMSN NEUTRAL SW SERVICE BRAKE SW #1 FAST IDLE ENABLE SW SENSOR COMMON CHECK ENGINE LAMP ATA DATA LINK+ (J1587) ATA DATA LINK- (J1587) VEHICLE SPEED IN+ -BATTERY +BATTERY -BATTERY +BATTERY NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT NOT USED USED USED USED USED USED USED USED USED USED USED USED USED USED USED USED USED USED USED USED USED USED USED USED

TO VEHICLE COMPONENTS

FROM (J1) ELECTRONIC CONTROL MODULE (ENGINE)

J1 P1

POWER PACK BULKHEAD

ELECTRONIC CONTROL MODULE (ECM)

B A

Inlet Air Heater

Inlet Air Heater Relay

Inlet Air Heater Ground Strap

RIGHT SIDE VIEW

SENR9525 November 1999

Electronic Service Tool Will Not Communicate with the ECM

Engine Cranks, But Will Not StartConnect Electronic Service Tool to the Cab data link, turn ignition key switch ON, engine OFF. Attempt to establish communications with the ECM.ECM does not communicate ECM Communicates

Engine Pressure Sensor Open or Short Circuit TestConnect Electronic Service Tool to Cab Data Link and check for ACTIVE 5 Volt Sensor Supply Code. NO ACTIVE Supply Codes Check for ACTIVE Engine Pressure Sensor OPEN or SHORT Circuit Code. If the code is not ACTIVE and the Engine is not running properly, refer to Troubleshooting Without A Diagnostic Code. ACTIVE Open or Short Circuit Code Check Electrical Connectors and Wiring. Active SHORT Circuit Code Turn the ignition key ON, engine OFF. Disconnect the Sensor Connector with the ACTIVE Short Circuit Code in order to create an Open Circuit condition. Code Changes To OPEN Circuit SHORT Circuit Code Remains ACTIVE Supply Code Refer to +5Volt Pressure Sensor Supply Voltage Circuit Test

Engine Temperature Sensor Open or Short Circuit TestConnect an Electronic Service Tool and check for an ACTIVE Engine Temperature Sensor OPEN or SHORT Circuit Code. If the code is not ACTIVE and the Engine is not running properly, refer to Troubleshooting Without A Diagnostic Code. ACTIVE Open or Short Circuit Code Check Electrical Connectors and Wiring.

Does not crank, refer to engine will not crank.

Try to start the Engine.Engine starts, but ECM does not communicate with the Service Tool

Does not start

Repair Service Tool

OK

Connect another Service Tool to the ECM, but use the same Service Tool Cables as in the previous step.No Communications

Ensure after-market engine protection devices (not installed by Caterpillar) are not active, preventing the ECM or Ignition Key Switch from receiving battery power.OK

NOT OK

Repair Cables

OK

Refer to Inspecting Electrical Connectors

Connect the Service Tool using a completely different set of Service Tool cables.No Communications

NOT OK

Active SHORT Circuit Code

Active OPEN Circuit Code With the ignition key On and engine OFF, Install a short circuit between terminal-1 and terminal-2 of the Sensor Connector and check for an ACTIVE Short Circuit code. OPEN Circuit Code Active with jumper SHORT Circuit Code Active with jumper

Refer to Inspecting Electrical Connectors

Active OPEN Circuit Code Measure Sensor Supply Voltage with multimeter. Reading should be within 4.5 to 5.5 VDC range. Supply OK NOT OK Refer to +5Volt Engine Pressure Sensor Supply Voltage Circuit Test

With the ignition key ON and engine OFF, Disconnect the Sensor Connector with the ACTIVE Short Circuit Code in order to create an Open Circuit condition. Code Changes To OPEN Circuit SHORT Circuit Code Remains

Disconnect ECM Connector P1 from the ECM. Use the Service Tool Bypass Harness as indicated in the Ignition Key Switch Circuit Test.ECM and Service Tool Communicate No Communications

Refer to the Ignition Keyswitch Circuit Test

NOT OK

Check ECM power, ground, and keyswitch connections with the ignition key switch ON. Battery voltage at ECM Connector J1/P1 terminal-52, 53 and 70, to terminal-65 and 67 should be 11.0 -13.5 VDC for a 12 Volt system and 22.0 - 27.0 for a 24 Volt system.OK

If a Short Circuit code was Active before the sensor was disconnected and an Open Circui