Massey Ferguson 03.00.A1 – MFA (Multi-Function Armrest): Issue With Speed Control Lever Position Sensor On Armrest Signal Voltage

The controller is receiving an out-of-range, erratic, or missing voltage signal from the Hall-effect sensor that monitors the physical position of the speed control lever (joystick) on the armrest.

• 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
• 5710S
• 5711S
• 5712S
• 5713S
• 5714S
• 6613
• 6614
• 6615
• 6616
• 6711S
• 6712S
• 6713S
• 6714S
• 6715S
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 8727S
• 8730S
• 8732S
• 8735S
• 8737S
• 8740S

1. 1

   Verify the reference voltage and ground supply to the MFA controller and the joystick sub-harness, as a drop in main supply voltage can cause sensor errors.

2. 2

   Inspect the wiring harness and connectors between the speed control lever and the Armrest Controller PCB for pinched wires, loose pins, or corrosion.

3. 3

   Check for magnetic interference or metallic debris around the joystick, ensuring the integrated shielding plates are intact.

4. 4

   Attempt a joystick/lever calibration routine via the tractor's terminal to correct potential voltage drift before replacing hardware.

1. 1

   Power down the tractor and disconnect the battery to prevent short circuits.

   Power down the tractor and disconnect the battery to prevent short circuits.

2. 2

   Remove the outer plastic covers/trim of the Multi-Function Armrest to expose the internal components.

   Remove the outer plastic covers/trim of the Multi-Function Armrest to expose the internal components.

3. 3

   Disconnect the main wiring harness from the Armrest Controller PCB.

   Disconnect the main wiring harness from the Armrest Controller PCB.

4. 4

   Unbolt the speed control lever (joystick element) from the armrest chassis.

   Unbolt the speed control lever (joystick element) from the armrest chassis.

5. 5

   If the fault is isolated to the lever's sensor, replace the Joystick Element assembly. If the fault is isolated to the board failing to process the voltage, replace the Armrest Controller PCB.

   If the fault is isolated to the lever's sensor, replace the Joystick Element assembly. If the fault is isolated to the board failing to process the voltage, replace the Armrest Controller PCB.

6. 6

   Install the new component, reconnect the harnesses, and reassemble the armrest housing.

   Install the new component, reconnect the harnesses, and reassemble the armrest housing.

7. 7

   Reconnect the battery, power on the tractor, and clear the 03.00.A1 fault code via the diagnostic terminal. Perform a joystick calibration if prompted by the system.

   Reconnect the battery, power on the tractor, and clear the 03.00.A1 fault code via the diagnostic terminal. Perform a joystick calibration if prompted by the system.