Massey Ferguson 03.X.A2 – MFA (Multi-Function Armrest): Issue With Speed Control Lever Position Sensor On Armrest Signal Voltage

An electrical fault indicating an out-of-range signal voltage (either too high or too low) coming from the position sensor that monitors the physical placement of the speed control lever.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Inspect the wiring harness routing through the armrest pivot point for chafing, pinching, or breaking

2. 2

   Access the speed control lever inside the armrest, disconnect the sensor, and check for bent pins, moisture, or corrosion

3. 3

   Turn the key to the ON position (engine off) and use a multimeter to verify the sensor is receiving the correct reference voltage (typically 5V) and has a solid ground

4. 4

   Check the signal wire between the sensor connector and the MFA module connector for continuity, high resistance, or a short to ground/power

5. 5

   Back-probe the signal wire and slowly move the speed control lever through its full range of motion to ensure the voltage scales smoothly without dropping out or spiking

1. 1

   Power Down

   Turn off the tractor and disconnect the negative battery cable to prevent electrical shorts while working inside the armrest.

2. 2

   Disassemble the Armrest

   Remove the retaining screws holding the upper plastic housing of the Multi-Function Armrest. Carefully lift the cover, taking care not to yank the wiring harnesses attached to the various switches and dials.

3. 3

   Locate the Sensor

   Identify the speed control lever assembly. The position sensor will be mounted directly to the base or pivot axis of the lever.

4. 4

   Remove the Sensor

   Disconnect the electrical pigtail. Remove the Torx or Allen screws securing the sensor to the lever assembly. (Note: On some MF models, the sensor is integrated into the lever assembly, requiring replacement of the entire joystick/lever unit).

5. 5

   Install the New Part

   Mount the new sensor/lever, ensuring the mechanical linkage aligns correctly with the sensor's rotational axis. Tighten the fasteners and reconnect the harness.

6. 6

   Reassemble and Calibrate

   Reinstall the armrest covers and reconnect the battery. Turn the key on. You will likely need to perform a Lever Calibration procedure via the tractor's Datatronic terminal or via dealer diagnostic software (EDT) so the MFA learns the new minimum, maximum, and neutral voltage values of the new sensor.

7. 7

   Clear Codes

   Clear the inactive 03.X.A2 fault code from the system.