STARTING MOTOR GP-ELECTRIC 2768900 - Caterpillar

System Operation Description:The Engine Speed/Timing Sensors provide engine speed information to the engine's Electronic Control Modules (ECM). The sensors generate a pulse signal. A loss of both signals causes the ECM to stop sending power to the fuel injectors.If the Primary Engine Speed/Timing Sensor fails, the ECM will use the Secondary Engine Speed/Timing Sensor until electrical power is removed from the ECM. To prevent any unnecessary down time, the primary sensor should be repaired or replaced at the earliest possible convenience.Note: If the ring gear is reversed, the Diagnostic Codes 190-08 and 342-08 will be generated and the ECM will not fire the injector solenoids.
Illustration 1 g00602826
Note: The Engine Control Switch (ECS) is mounted within an instrument panel that is located on the right side of the engine. The ECS is locked into the AUTO position with a pin. The pin must be removed in order to perform this test. After performing this test, ensure that the ECS is placed in the AUTO position and that the locking pin has been reinstalled.Test Step 1. Check for Connector Damage
Turn the circuit breaker for the battery to the OFF position.
Turn the ECS to the OFF/RESET position.
Disconnect the main power.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors. Refer to the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
Check the customer connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the harness and the wiring for abrasion and pinch points.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring should be free of corrosion, of abrasion or of pinch points.Results:
OK - The connectors and wiring are okay. Proceed to test step 2.
Not OK - The connectors and/or wiring need repair.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Stop.Test Step 2. Check for a CID-FMI.
Connect the Caterpillar Electronic Technician (ET).
Turn the circuit breaker for the battery to the ON position.
Turn the ECS to the STOP position.
Observe Logged Diagnostic Codes on the Cat ET.Expected Result:The Cat ET should indicate a CID-FMI 190-03 or 342-03.Results:
OK - The Cat ET indicates a CID-FMI 190-03 or 342-03. Proceed to test step 3.
Not OK - The Cat ET does not indicate a CID-FMI 190-03 or 342-03. Proceed to test step 4.Test Step 3. Check for Shorts in Wiring Harness
Turn the ECS to the OFF/RESET position.
Disconnect J1/P1 from the Primary ECM. Disconnect J1/P1 from the Secondary ECM. Disconnect the Primary Engine Speed/Timing Sensor J20/P20. Disconnect the Secondary Engine Speed/Timing Sensor J44/P44.
To test the Primary Engine Speed/Timing Sensor, measure the resistance at the Primary ECM connector P1:Measure