Massey Ferguson 05.03.82 – SUSPENSION Module (Autotronic 4 or Autotronic 5): Issue With Signal Voltage From Suspended Front Axle Position Sensor. (SUSPENSION)

The electronic system is receiving a voltage signal from the front axle position sensor (X166 sensor) that is outside the expected parameters (either too high, too low, or out of calibration range).

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 5400 Series (5425, 5435, 5445, 5455, 5460)
• 5600 Series (5608, 5609, 5610, 5611, 5612, 5613 iT4)
• 5700 Series
• 6400 Series
• 6600 Series
• 6700 Series
• 7400 Series
• 7600 Series (7614, 7615, 7616, 7618, 7619, 7620, 7622, 7624, 7626)
• 7700 Series
• 8600 Series
• 8700 Series

1. 1

   Inspect the wiring harness and connector going to the X166 Suspended Front Axle Position Sensor for moisture intrusion and corrosion from hydraulic fluid or road salt

2. 2

   Check the valve/sensor battery supply voltage to ensure it is greater than 9.5V, inspecting around the battery and alternator for debris or corrosion that could cause voltage drops

3. 3

   Delete active fault codes, start the vehicle, and road test on rough terrain for 5 minutes; if the fault returns, check wiring continuity back to the Vehicle Load Centre (VLC) or suspension control box

4. 4

   Check for associated Autotronic 5 flash codes (e.g., FA133 for value too high, FA134 for value too low, FA135/FA136 for calibration out of range) to determine if the sensor has failed completely or just lost calibration

1. 1

   Locate the Sensor

   Find the X166 position sensor mounted on the front axle suspension linkage.

2. 2

   Removal

   Disconnect the wiring harness. Unbolt and carefully remove the old sensor (handle with care as it is a precision instrument).

3. 3

   Installation

   Install the new sensor. Ensure the connections are completely clean and properly sealed to prevent future moisture intrusion.

4. 4

   Calibration

   The system must be calibrated after sensor replacement for proper operation. Manual Method: Hold the front axle suspension button until it flashes, release it. Press again and hold until the suspension reaches the top stop, release. Press the off/down button until it reaches the bottom stop, then release. Terminal Method: Use the tractor's diagnostic terminal to run the 'Calibrate the suspended front axle' procedure as outlined in the Autotronic 5 service menu.

5. 5

   Testing

   Activate the front axle suspension system several times from the lowest to the highest position to check for smooth operation and ensure no error codes return.