 | |
| Illustration 1 | g00795097 |
System Schematic For Electronic Governor Relay (EGR) | |
The GSC+ uses the electronic governor relay (EGR) to signal the engine control module (ECM) to begin injection. The GSC+ activates the EGR when the engine oil pressure is greater than the setpoint for low oil pressure shutdown at idle speed ("P014"). Also, "K1" will be present on the lower display. This closes the relay contacts of the EGR. The output for the electronic governor relay is rated at 1 amp. The EGR is located within the relay module.
Note: Whenever the GSC+ activates or the GSC+ attempts to activate the EGR, "K1" is shown on the lower display. When the EGR is not activated, "K1" is not shown.
The possible causes of this diagnostic code are listed:
- The EGR has an open coil or a shorted coil.
The results to this diagnostic code are listed:
- If CID 0441 FMI 12 occurs during the activation of the EGR, the ECM will stop the fuel injection and the engine will shut down immediately.
- If CID 0441 FMI 12 occurs and the EGR is not activated, the engine will be unable to start.
Clear the diagnostic code from the fault log after troubleshooting is complete. The GSC+ treats a CID 0441 FMI 12 as an alarm fault. The active alarm faults are shown on the display when the alarm codes key is pressed. The active alarm faults will be displayed when the ECS switch is placed in any position except for the OFF/RESET position.
This troubleshooting procedure is for an active CID 0441 FMI 12 or the troubleshooting procedure is for an inactive CID 0441 FMI 12.
Test Step 1. CHECK THE STATUS OF THE DIAGNOSTIC CODE.
- Turn the ECS to the OFF/RESET position and then turn the ECS to the STOP position.
- Press the "Alarm Codes" key.
- Observe the upper display. Check that the CID 0441 FMI 12 is active.
- If the diagnostic code is not active, enter the Service Mode. View the fault log for a OP1. Check that the diagnostic code is inactive.
Expected Result:
A CID 0441 FMI 12 is displayed as an active diagnostic code or CID 0441 FMI 12 is displayed as an inactive diagnostic code.
Results:
- OK - The CID 0441 FMI 12 is active or the CID 0441 FMI 12 is inactive. Proceed to test step 2.
- NOT OK - The CID 0441 FMI 12 has not occurred. The diagnostic code is not active and the diagnostic code is not inactive. Stop.
Test Step 2. CHECK THE INTERNAL CABLE OF THE RELAY MODULE.
Note: Only open the relay module in a dry environment. If the inspection and the repair is over twenty minutes, replace the desiccant bag inside the GSC+. See Testing And Adjusting, "Relay Module - Replace".
- Turn the ECS to the OFF/RESET position.
- Disconnect the negative battery cable.
- Temporarily, remove the relay module from the GSC+. See Testing And Adjusting, "Relay Module - Replace".
- Check the cable that attaches the relay module to the GSC+.
Expected Result:
The cable should be firmly seated in the connector. The clamp should be in place. The cable should not be damaged.
Results:
- OK - The cable is firmly seated in the connector. The clamp is in place. The cable is not damaged. Reassemble the relay module to the GSC+. Proceed to test step 3.
- NOT OK - One or more of the components are damaged or the components are missing.
Repair: Replace the clamp if the clamp is missing. If the cable is damaged, replace the GSC+. See Testing and Adjusting, "EMCP Electronic Control (Generator Set) - Replace".
Stop.
Test Step 3. PERFORM A FUNCTIONAL CHECK ON THE EGR.
- Turn the ECS to the OFF/RESET position.
- Reconnect the negative battery cable.
- Disconnect all wires from RM-13 and RM-14 of the relay module.
- At the relay module, measure the resistance from RM-13 to RM-14. Make a note of the resistance measurement.
- Start and run the engine. Make sure that the engine oil pressure is greater than the setpoint for low oil pressure shutdown at idle speed (P014).
- At the relay module, measure the resistance from RM-13 to RM-14. Make a note of the resistance measurement.
Expected Result:
The initial resistance measurement after removing the wires from the relay module should be 5000 ohms. The resistance measurement should be 5 ohms after exceeding the setpoint for low oil pressure shutdown at idle speed.
Results:
- OK - The resistance measurements are correct. The problem does not exist at this time. The initial problem was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal operation and watch for a recurrence. Stop.
- NOT OK - Either one of the resistance measurements are NOT correct. The relay module has failed.
Repair: Replace the relay module. See Testing And Adjusting, "Relay Module - Replace".
Stop.