PUMP GP 4T8516 - Caterpillar

Illustration 1 g00596877
System Schematic For An Unexpected ShutdownThe engine does not shut down when a shutdown fault occurs.
Check for any diagnosed faults.
Check the display area of the GSC for a fault indicator that is FLASHING. Check for a fault code on the upper display.Note: If the fault alarm indicator is ON CONTINUOUSLY, then the GSC is programmed to override the normal shutdown response and the GSC is programmed to treat the condition as an alarm fault. The engine continues to run and the engine is able to start. This is not a problem. To view the setpoints, see Systems Operation, "Engine/Generator Setpoint Viewing OP2". To reprogram the setpoints, see Systems Operation, "Engine/Generator Programming OP5".Expected Result: The engine does not shut down when a shutdown fault occurs.Results:
Not OK - If all fault indicators are OFF and a fault exists that should cause the GSC to shutdown the engine, then proceed to 6.
Not OK - If the fault shutdown indicator is FLASHING and the engine remains running, then proceed to 2.
System check.The engine remains running and the fault shutdown indicator is FLASHING.
Turn the ECS to OFF/RESET.Expected Result: The engine should shut down.Results:
OK - The engine shuts down. The system is functioning properly. Start the engine again. If the fault shutdown indicator is FLASHING and the engine does not shut down, replace the GSC. See Testing And Adjusting, "EMCP Electronic Control (Generator Set) - Replace". STOP.
Not OK - The engine does NOT shut down. Proceed to 3.
System check.The engine remains running and the fault shutdown indicator is FLASHING.
Push the emergency stop push button (ESPB).Expected Result: The engine should shut down.Results:
OK - The engine shuts down. Therefore, an unwanted voltage is present at TS2-39 of the generator terminal strip. Check the related wiring for this unwanted short. If no short to ground (B-) is found in the related wiring, then replace the relay module. See Testing And Adjusting, "Relay Module - Replace". STOP.
Not OK - The engine does NOT shut down. Proceed to 5.
System check.The engine remains running and the fault shutdown indicator is FLASHING.
Remove all the wires from the terminal TS2-40 in the generator housing.Expected Result: The engine should shut down.Results:
OK - The engine shuts down. Check the wiring. There is a short to +battery between TS2-40 and TS2-39. Troubleshoot the ESPB and all related wiring. See Testing And Adjusting, "Schematics And Wiring Diagrams". STOP.
Not OK - If the engine does not shut down, then proceed to 5.
System check.The engine remains running and the fault shutdown indicator is FLASHING.
Disconnect the fuel shutoff solenoid from the engine harness. Disconnect the contacts "A" and "B" of the solenoid.Expected Result: The engine should shut down.Results:
OK - The engine shuts down. There is a short to the +battery in the engine harness. Troubleshoot the wiring. See Testing And Adjusting, "Schematics And Wiring Diagrams". STOP.
Not OK - The engine does not shut down. The fuel shutoff solenoid is stuck. Refer to the Engine Service Manual in order to troubleshoot.
Determine the fault.This step continues troubleshooting from step 1.Note: