Massey Ferguson 03.02.1A – MFA (Multifunction Armrest): CAN Bus Message From Spool Valve Controls 1 And 2 On Arm Rest (MFA)

This code indicates a communication failure on the CAN bus network. Specifically, the system is not receiving the expected CAN messages from the spool valve controls (valves 1 and 2), which are typically operated via the fingertip linear modules (rockers) or the crossgate lever (joystick) on the armrest. When this fault occurs, the affected valves will typically default to a neutral position and lock out to prevent unintended operation.

• 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
• 5700 S / SL Series
• 6600 Series
• 6700 S Series
• 7600 Series
• 7700 S Series
• 8600 Series
• 8700 S Series

1. 1

   Physically inspect the linear modules (fingertip rockers) and crossgate lever (joystick) for valves 1 and 2 to ensure they are not stuck, jammed, or engaged when the ignition is switched on.

2. 2

   Verify the supply voltage to the spool valve controls (the system will lock the valves in neutral if the supply voltage drops below 8 volts or spikes above 18 volts).

3. 3

   Inspect the wiring harness and connectors between the spool valve controls and the MFA (A100) armrest module for damaged wires, pushed-out pins, or corrosion.

4. 4

   Connect a diagnostic tool (e.g., AGCO EDT, Jaltest, or Bosch ESI[truck]) to check for secondary codes related to the MFA module or specific linear module calibration errors.

1. 1

   Free Stuck Controls

   If the fingertip switches or joystick are physically sticking, clean the surrounding housing of dirt and debris. Ensure they return to the center/neutral position freely.

2. 2

   Harness Repair

   If diagnostic checks reveal a break or short in the CAN bus wiring inside the armrest, repair or replace the damaged section of the harness.

3. 3

   Replace the Switch

   If the wiring is intact and the controls are not physically jammed, the internal circuitry of the spool valve control switch has likely failed. Disassemble the armrest console and replace the faulty electric spool switch/linear module.

4. 4

   System Calibration

   After replacing the switch or repairing the wiring, you must recalibrate the controls. Use a compatible diagnostic tool to perform the 'calibration of the spool valve control lever' or 'joystick calibration' within the MFA armrest system menu.