The GSC+P uses the Crank Terminate Relay (CTR) as part of the logic to activate the Voltage Build up Relay (VBR). The CTR is located within the relay module. The governor control switch is located on the front panel.
The CTR is used to indicate when the engine is finished cranking. The GSC+P activates the CTR when engine speed is greater than the crank terminate setpoint. (Setpoint P011 should be 400 RPM.) Also, the starting motor relay has been deactivated. The CTR deactivates when the engine RPM reaches 0.
Note: Whenever the GSC+P activates the CTR, "K3" is shown on the lower display. When the CTR is not activated, "K3" is not shown.
The possible cause of a CID 0443 FMI 12 is an open coil or a shorted coil of the CTR.
The system responses to this diagnostic code are listed below.
- If a CID 0443 FMI 12 occurs and the CTR is activated, the engine will continue to run, but the Generator Running Relay (GRR) and the governor control switch are deactivated. On PEEC engines, the AUX is deactivated.
- If a CID 0443 FMI 12 occurs and the CTR is not activated, then the engine is able to start and the engine is able to run. The GRR is not activated and the Governor control switch is not activated. On PEEC engines, the AUX is not activated.
The GSC+P treats a CID 0443 FMI 12 as an alarm fault. Active alarm faults are shown on the display when the "Alarm Codes" key is pressed. Also, the active alarm faults are shown when the Engine Control Switch (ECS) is in any position except the OFF/RESET position. Clear the diagnostic code from the fault log after troubleshooting is complete.
This troubleshooting procedure is used to correct an active CID 0443 FMI 12 or the troubleshooting procedure is for an inactive CID 0443 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 0443 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 0443 FMI 12 is displayed as an active diagnostic code or CID 0443 FMI 12 is displayed as an inactive diagnostic code.
Results:
- OK - The CID 0443 FMI 12 is active or the CID 0443 FMI 12 is inactive. Proceed to Test Step 2.
- NOT OK - The CID 0443 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 repair takes more than approximately twenty minutes replace the desiccant bag in the GSC+P housing. Refer to Testing And Adjusting, "Relay Module - Replace".
- Turn the ECS to the OFF/RESET position.
- Disconnect the battery negative cable.
- Temporarily, remove the relay module from the GSC+P. Refer to Testing And Adjusting, "Relay Module - Replace".
- Check the cable that attaches the relay module to the GSC+P.
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+P. 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+P. Refer to Testing and Adjusting, "EMCP Electronic Control (Generator Set) - Replace".
STOP
Test Step 3. PERFORM A FUNCTIONAL CHECK ON THE CTR.
- Turn the ECS to the OFF/RESET position.
- Reconnect the battery negative cable.
- Disconnect all wires from RM-16 of the relay module.
- Remove fuse "F1" from the relay module.
- At the relay module, measure the resistance from RM-16 to RM-3. Make a note of the resistance measurement.
- Start and run the engine. Make sure that the engine speed is greater than crank terminate setpoint (P011).
- At the relay module, measure the resistance from RM-22 to RM-7. Make a note of the resistance measurement.
Expected Result:
The initial resistance measurement after removing the wires from the relay module should be greater than 5000 ohms. The resistance measurement should be less than 5 ohms after exceeding the crank terminate setpoint.
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. Refer to Testing And Adjusting, "Relay Module - Replace".
STOP