CARTRIDGE GP-TURBOCHARGER 6I2269 - 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. The ECM will prelube the engine, when the Engine Control Switch (ECS) is placed in 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", "ON", "COMPLETED" and "DISABLED".The "OFF" status is entered when the engine control is first powered up with the ECS in the STOP position.The "ON" status is entered when the ECM is on with the ECS in the START position.The "COMPLETED" status is entered when the engine prelube duration is reached or when the engine prelube pressure switch is activated.The "DISABLED" status is entered when the engine prelube duration is programmed to 0.The prelube function will be aborted when one of the following conditions occur:
The prelube pressure switch is activated.
The user defined engine prelube duration has been reached.
The operator activates the prelube override switch.When the ECM senses the ECS in the START position, the ECM will activate the sinking driver for the prelube pump. This input allows current to flow through the main prelube relay to the ECM. When the main prelube relay energizes, the normally open contacts of the main prelube relay close. This allows current to flow to the prelube relay. The normally open contacts of the prelube relay close. This allows current to flow to the prelube motor. The prelube motor activates the prelube pump. The prelube pump builds pressure in the prelube system. When the prelube pressure switch closes as a result of the increased pressure in the prelube system, the ECM input for the prelube pressure switch is taken low. The ECM then knows that the prelube pressure is adequate to prelube the engine. The ECM will begin the starting sequence.
Illustration 1 g00979679
Typical example
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.
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 2.25 0.25 N m (20 2 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