ROCKER ARM GP 6I1650 - Caterpillar

System Operation Description:The Generator Set Control (GSC+) has the ability to crank the engine when the Engine Control Switch (ECS) is placed in the START position. When the ECS is placed in the START position, the ECM will activate the prelube system. Refer to Troubleshooting, "Prelubrication System". The GSC+ will start the first crank cycle when the prelube is completed. The crank cycle continues for the programmed time or the engine speed reaches the crank terminate speed. If crank terminate speed is not reached before reaching the cycle crank time, the starting motor will deactivate for a time that is equal to the cycle crank time.This process will repeat for a programmed amount of times (Total Number of Crank Cycles). If the engine does not start, the start mode on the Caterpillar Electronic Technician (ET) will display "OVERCRANK". The engine control will be in an idle state. The crank cycle can be restarted by turning the ECS to the OFF/RESET or STOP position and then turning the ECS to the START position.Note: When the starting motor fails to engage the flywheel due to a Butt engagement, that crank cycle will still be counted in the total number of crank cycles.
Illustration 1 g01024122
Typical circuit with EMCP IITest Step 1. Check for Connector Damage.
Turn the ECS to the OFF/RESET position.
Turn the battery disconnect switch to the OFF 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 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 need repair.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Stop.Test Step 2. Attempt to Start the Engine
Connect the Cat ET to the service tool connector.
Turn the battery disconnect switch to the ON position.
Turn the ECS to the STOP position.
Observe the "startup mode" parameters on the Cat ET status screen.
Turn the ECS to the START position. Continue monitoring engine parameters as the engine cranks.
The crank cycle will continue for the time that is equal to the cycle crank time that has been programmed or the crank cycle will continue until the engine speed reaches the crank terminate speed.
Turn the ECS to the OFF/RESET position.Expected Result:The status screen for the "startup mode" parameter displays "CRANK". The engine cranks.Results:
OK - The "startup mode" parameter on the status screen on Cat ET displays "CRANK". The