Description:

This fault code indicates that the MFWD (Mechanical Front-Wheel Drive) speed signal is either missing or out of the operating range while the cruise control is not engaged. This can be caused by sensor malfunction, wiring issues, or problems with the hydrostatic control unit.

Reaction:

When this error is detected, the MFWD system may not function correctly, potentially affecting the vehicle’s traction and stability. The system might disable MFWD functionality to prevent damage or unsafe operating conditions.

Recommendations:

Inspect MFWD Engagement Sensing Switch (S40):

• Check the switch for proper operation.
• Ensure there are no signs of damage or wear.
• Verify proper electrical connections.

Test Power Train Hydrostatic Control Unit (PTH):

• Perform diagnostics on the control unit to check for any faults.
• Ensure all connections to the control unit are secure and free from corrosion.

Check Wiring and Connections:

• Inspect the wiring harness connected to the MFWD speed sensor for any damage or loose connections.
• Repair or replace damaged wiring as necessary.

Verify Sensor Operation:

• Test the MFWD speed sensor to ensure it is functioning within the specified range.
• Replace the sensor if it is found to be faulty.

Update Control Software:

• Ensure the control unit software is updated to the latest version to include any recent fixes or improvements.

Consult Technical Support:

• If the problem persists after performing the above steps, consult with technical support for further assistance.

Monitor System Performance:

• After addressing the issue, monitor the MFWD system to ensure normal operation and that the fault does not reoccur.

Note:

Regular checks and maintenance of the MFWD system and associated sensors can prevent such issues. Consider environmental factors that may affect sensor performance, such as dirt, debris, or extreme temperatures.