Illustration 1 | g00825756 |
Schematic of the Transmission Oil Temperature Sensor |
The CID 0041 FMI 04 diagnostic code is recorded when the power train electronic control module (ECM) reads the voltage of the sensor supply circuit (wire 709-OR) as less than 7.5 DCV. This failure may cause the transmission oil temperature to be incorrect. This will affect the quality of the shift.
The possible causes for this diagnostic code are listed:
- The sensor supply circuit to the transmission oil temperature sensor is shorted to ground.
- A sensor has failed.
- The power train ECM has failed. This is unlikely.
Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0041 FMI 04 is active before performing this procedure.
Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.
Test Step 1. CHECK THE SENSOR
- Turn the disconnect switch and the key start switch to the ON position.
- Ensure that the diagnostic code is active.
- Observe the status of the diagnostic code. Disconnect the sensor from the machine harness.
Expected Result:
The CID 0041 FMI 04 remains active. The FMI has not changed and the "04" is still active.
Results:
- OK - The diagnostic code remains active. The sensor is correct. Proceed to Test Step 2.
- NOT OK - The diagnostic code is no longer active. The sensor has failed.
Repair: Replace the sensor.
Stop.
Test Step 2. CHECK THE WIRING HARNESS OF THE SENSOR FOR A SHORT TO GROUND
- Turn the key start switch and the disconnect switch to the OFF position.
- Disconnect the machine harness from the sensor.
- Disconnect the machine harness connector(s) from the ECM.
- At the machine harness connector for the ECM, measure the resistance from the signal contact J2-18 (wire 709-OR) of the machine harness to all possible sources of ground. Measure the resistance to all contacts of the machine harness connectors for the ECM.
Expected Result:
Each resistance measurement is greater than 5000 ohms.
Results:
- OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
- NOT OK - One or more resistance measurements is not correct. There is a short in the machine harness. The short is between signal contact J2-18 (wire 709-OR) and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness. Stop.
Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS
- Inspect the contacts of the harness connectors and clean the contacts.
- Reconnect all harness connectors.
- Turn the disconnect switch and the key start switch to the ON position.
- Operate the machine.
- Check the status of the CID 0041 FMI 04.
Expected Result:
The CID 0041 FMI 04 is active.
Results:
- YES - The CID 0041 FMI 04 is active. The diagnostic code has not been corrected. The ECM may have failed.
Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. See Troubleshooting, "Electronic Control Module (ECM) - Replace".
Stop.
- NO - The CID 0041 FMI 04 is not active. The diagnostic code does not exist at this time.
Repair: The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.
Stop.