Description:

This error code, EPC 000177.04, indicates that the control unit has detected a voltage that is too low at the signal input of the transmission oil temperature sensor (lead 6002). This typically means the temperature value is above 125°C (257°F), suggesting a short to ground in the sensor circuit.

Reaction:

When this error is detected, the control unit may not accurately monitor the transmission oil temperature, which can lead to improper transmission operation and potential damage due to overheating.

Recommendations:

Inspect Sensor Wiring:

• Check the wiring associated with the transmission oil temperature sensor (B60) for any signs of shorts to ground. Repair or replace any damaged wiring.

Test Sensor Functionality:

• Use diagnostic tools to test the transmission oil temperature sensor. Replace the sensor if it is found to be faulty.

Verify Connections:

• Ensure all connectors and terminals in the sensor circuit are secure and free of corrosion. Repair or replace any faulty connections.

Check for Ground Faults:

• Use a multimeter to check for ground faults in the sensor circuit. Resolve any detected faults.

Reset and Test System:

• After addressing the issues, reset the system and monitor the transmission oil temperature readings to ensure they are accurate.

Note:

Ensuring the integrity of sensor wiring and connections is crucial for accurate temperature monitoring and proper transmission operation. Regular checks can help prevent such issues and ensure reliable performance.