Massey Ferguson 3.01.1A – MFA: CAN Bus Message From Spool Valve Controls 1 And 2 On Arm Rest (MFA)

Communication failure on the Controller Area Network (CAN bus) specifically relating to the electronic fingertip switches or the multifunction joystick that controls hydraulic spool valves 1 and 2. The system is either receiving an implausible signal, no signal, or detecting a hardware fault.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 5700 S / SL Series
• 6600 Series
• 6700 S Series
• 7600 Series
• 7700 / 7700 S Series
• 8600 Series
• 8700 / 8700 S Series

1. 1

   Visually and physically inspect the spool valve fingertip rockers and multifunction joystick to ensure no buttons or linear modules are stuck in an active position.

2. 2

   Lift the armrest console and inspect the wiring harness connecting the joystick/fingertip elements to the main MFA controller board for pinched wires, chafing, or loose connector pins.

3. 3

   Verify that the TECU/MFA is supplying the correct reference voltage (typically 10V or 5V) and a solid ground to the armrest controls.

4. 4

   Connect a diagnostic tool to view live data for the spool valve controls and attempt to run the spool valve control lever or joystick calibration routine.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery ground to prevent electrical spikes.

2. 2

   Access the Armrest Internals

   Remove the retaining screws on the underside or perimeter of the MFA armrest to lift the top cover/bezel exposing the control elements.

3. 3

   Remove the Faulty Component

   Disconnect the multi-pin connector from the bottom of the spool valve fingertip module or the multifunction joystick. Remove the mounting screws securing the unit to the armrest chassis.

4. 4

   Install the New Component

   Seat the replacement joystick or fingertip module into the armrest, secure the mounting hardware, and plug in the electrical connector.

5. 5

   Reassemble

   Reinstall the armrest cover and reconnect the battery.

6. 6

   Mandatory Calibration

   Turn the key on. You must perform a calibration of the new spool valve control lever/joystick through the tractor's Datatronic/System Display terminal or by using an AGCO-compatible diagnostic laptop.