GOVERNOR GP-UNIT INJECTOR 4P5736 - Caterpillar

System Operation Description:The Electronic Control Module (ECM) has the ability to automatically prelube the engine before cranking. This prelubrication may increase the life of certain engine parts. The ECM will prelube the engine, when the Engine Control Switch (ECS) is placed in the START position or the AUTO position and the remote start/run/stop switch is closed. The length of time for the prelube cycle can be programmed by the customer. The prelube cycle will end when the prelube pressure switch closes or if the customer programmed time ends. The engine speed must equal zero rpm before the prelube will begin.The prelube cycle has the following status codes."OFF" - The ECM is powered and the ECS is in the STOP position."ON" - The ECM is powered and the ECS is in the START position."COMPLETED" - The prelube has timed out or the prelube pressure switch has activated."DISABLED" - The engine prelube duration is programmed to 0.
Illustration 1 g01021696
Typical exampleTest 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.
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 for pinch points.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are 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 are not okay.Repair: Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 2. Check for Output Voltage to the Prelube Motor.
Turn the circuit breaker for the battery to the ON position.
Turn the ECS to the OFF/RESET position.
Connect one lead of a voltmeter to the −Battery terminal.
Connect the other lead of the voltmeter to wire C465-OR on terminal 2 of the prelube switch.
Turn the ECS to the START position.
Monitor the voltage on the voltmeter.
Turn the ECS to the STOP position.Expected Result:The voltage is