Massey Ferguson 03.00.1A – MFA (Multi-Function Armrest): CAN Bus Message From Spool Valve Controls 1 And 2 On Arm Rest (MFA)

This indicates a communication failure on the Controller Area Network (CAN) bus. Specifically, the control module is not receiving the expected data signals from the electronic fingertip spool valve switches (or micro-joystick) that control hydraulic valves 1 and 2 on the armrest. This is typically caused by damaged wiring, a loose connector, or an internal failure of the spool valve switch assembly itself.

• 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
• 5S Series
• 6S Series
• 7S Series
• 8S Series
• 5600 Series
• 5700 S/SL Series
• 6600 Series
• 6700 S Series
• 7600 Series
• 7700 Series
• 7700 S Series
• 8600 Series
• 8700 Series
• 8700 S Series

1. 1

   Inspect the wiring harness and connectors between the spool valve fingertip controls/micro-joystick and the MFA module inside the armrest console for chafing, pinched wires, or loose pins.

2. 2

   Test the CAN High and CAN Low lines for continuity between the switch connector and the MFA module. Verify that the CAN bus network shows the correct resistance (typically ~60 ohms across the network).

3. 3

   Verify that the spool valve control switches are receiving proper power and ground supply from the armrest harness.

4. 4

   Connect a diagnostic tool and monitor the live data for the MFA module. Check if any switch inputs are recognized when manually toggling the controls to determine if the switch assembly has failed.

1. 1

   Power down and disconnect battery

   Power down the tractor and disconnect the battery to prevent electrical shorts.

2. 2

   Remove trim panels

   Carefully remove the trim panels and covers on the MFA armrest console to access the internal wiring and the spool valve control switches.

3. 3

   Disconnect electrical connector

   Disconnect the electrical connector for the spool valve 1 and 2 fingertip controls (or the integrated micro-joystick).

4. 4

   Repair wiring or replace pigtail

   If wiring damage was found during diagnostics, repair the CAN bus wires or replace the damaged connector pigtail.

5. 5

   Remove faulty switch assembly

   If the wiring is intact, remove the mounting hardware securing the faulty spool valve switch assembly and extract it from the armrest.

6. 6

   Install replacement switch assembly

   Install the replacement spool valve control switch assembly and secure it.

7. 7

   Reconnect harness and reassemble covers

   Reconnect the electrical harness and reassemble the MFA armrest covers.

8. 8

   Reconnect battery and turn ignition on

   Reconnect the battery and turn the ignition on.

9. 9

   Clear fault code and calibrate

   Connect your diagnostic tool, clear the 03.00.1A fault code, and perform the "spool valve control lever calibration" procedure. Note: Calibration of the MFA armrest spool valve controls is required after replacement so the module can learn the new component's limits.