Electronic Modular Control Panel II+ (EMCP II+) for EUI Engines Caterpillar

Illustration 1	g00479969
System Schematic For Electronic Governor Relay (EGR)

Illustration 2	g00479971
System Schematic For Air Shutoff Relay (ASR)

Illustration 3	g00481066
System Schematic For Engine Control Switch (ECS)

Illustration 4	g00479362
System Schematic For Emergency Stop Circuit On ETR Systems

The engine does not shut down when a shutdown fault occurs.

1. Check for any diagnosed faults.

   1. 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 of the fault indicators are OFF, the faults that could shut down the engine are not present. If a shutdown fault is present, proceed to Step 5.

      • NOT OK: If the fault shutdown indicator is FLASHING and the engine remains running, then proceed to Step 2.

2. Check the system.

   The engine remains running and the fault shutdown indicator is FLASHING.

   1. 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 Step 3.

3. Check the system.

   The engine remains running and the fault shutdown indicator is FLASHING.

   1. Push the emergency stop push button (ESPB).

      Expected Result: The engine should shut down.

      Results:

      • OK: The engine shuts down. Therefore, it is likely that a short to ground (B-) is present at RM-14 of the relay module. 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 Step 4.

4. Check the system.

   The engine remains running and the fault shutdown indicator is FLASHING.

   1. Stop the engine. Turn the battery disconnect switch to the OFF position or shut down the engine by mechanical means.

   2. The following two possibilities could be causing the problem.
      • A wiring error exists with the emergency stop push button.

      • A wiring error exists between RM-14 and the engine ECM (pins 8 and 14).

   3. Troubleshoot the possible wiring errors. Refer to Testing And Adjusting, "Schematics and Wiring Diagrams".

   4. Check if the problem is still present.

      Expected Result: The original problem should no longer occur.

      Results:

      • OK: The original problem should no longer occur. STOP.

      • NOT OK: The original problem still occurs. Refer to the Engine Service Manual in order to troubleshoot.

5. Determine the fault.

   This step continues troubleshooting from step 1.

   Note: For a fault with the coolant loss sensor that does not shut down the engine, see Testing And Adjusting, "Troubleshooting Diagnostic Codes".

   1. For the following faults, make a note of all the engine information that is showing on the lower display of the GSC+.
      • engine overspeed

      • low oil pressure

      • high water temperature fault that does not shut down the engine

   2. View the related setpoints. See Systems Operation, "Engine/Generator Setpoint Viewing OP2".

   3. Compare the engine information that is showing on the lower display with the related setpoints.

      Expected Result: The information on the lower display and the related setpoint values should agree.

      Results:

      • OK: The information that is showing on the lower display is within the related setpoint. The GSC+ is not causing the shutdown. STOP.

      • NOT OK: The information that is showing on the lower display is beyond the related setpoint. Then, the GSC+ is faulty. Replace the GSC+. See Testing And Adjusting, "EMCP Electronic Control (Generator Set) - Replace". STOP.