Massey Ferguson X235 – Instrument Panel (X55): Front Axle Steering Sensor Signal Error

The fault code X235 signifies a signal error from the front axle steering sensor (Wheel Angle Sensor or WAS). This sensor is an angular potentiometer that monitors the precise angle of the front wheels. The control module has detected that the signal from this sensor is outside of its expected range or is otherwise incorrect, which may affect the proper operation of the steering system, auto-guidance, or automatic 4WD.

• MF 8600 Series
• MF 7600 Series
• MF 7614
• MF 7615
• MF 7616
• MF 7617
• MF 7618
• MF 6700 S Series
• MF 6712 S
• MF 6713 S
• MF 6714 S
• Dyna-4 & Dyna-6 models

1. 1

   Visually inspect the steering angle sensor, its wiring harness, and connectors for any visible signs of damage, corrosion, dirt, loose connections, or harness rub points against the frame.

2. 2

   Check power and ground by back-probing the sensor's electrical connector to verify the correct voltage on the power supply pin (typically 5-volts) and continuity to a known good chassis ground.

3. 3

   Test the signal wire by measuring voltage with the ignition on while an assistant slowly turns the steering wheel from lock to lock. The voltage should change smoothly and consistently without dropouts or spikes.

4. 4

   Perform a wiggle test by gently wiggling the wiring harness and connector while monitoring the signal voltage to check for intermittent connection issues.

1. 1

   Confirm the fault

   Complete the diagnostic checks to confirm that the sensor itself is the source of the fault and not a wiring or power supply issue.

2. 2

   Replace the sensor

   If the sensor is determined to be faulty, replace the steering angle sensor located on the front axle.

3. 3

   Calibrate the new sensor

   After replacement, the new steering angle sensor must be calibrated using a dealer-level diagnostic tool (like AGCO's EDT) or through a specific procedure outlined in the tractor's service manual. This teaches the control module the straight-ahead position and end-stops.