TURBOCHARGER GP 4P2783 - Caterpillar

System Operation Description:The Electronic Control Module (ECM) has the ability to crank the engine when the Engine Control Switch (ECS) is placed in the BLACK START ENABLE position. The engine control will start the first crank cycle, when the ECS is placed in the BLACK START ENABLE position. When the BLACK START ENABLE push button is depressed, 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. If crank terminate speed is not reached before 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 Caterpillar Electronic Technician (ET) will display "OVERCRANK". The engine control will be in an idle state. The process can be restarted by turning the ECS to the OFF/RESET. Next turn the ECS to the STOP position. Then turn the ECS to the BLACK START ENABLE position.
Illustration 1 g00926369
Test Step 1. Check for Connector Damage.
Disconnect the main power.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors. Perform the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors".
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, abrasion or 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
Turn the circuit breaker for the battery to the ON position.
Connect the Cat ET to the service tool connector.
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.Expected Result:The status screen for the "startup mode" parameter should display "CRANK". The engine cranks.Results:
OK -