Massey Ferguson 05.00.31 – Transmission Control Module (TRANS): Issue With Signal From 4wd Button On Side Pillar Dyna VT

The system is detecting an abnormal, missing, or out-of-range electrical signal from the manual 4-Wheel Drive (4WD) engagement button located on the right-hand side pillar (B-pillar) of the cab. This prevents the controller from verifying the operator's input for the 4WD system.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Inspect the 4WD button on the side pillar for physical damage, sticking, or failure to spring back when pressed.

2. 2

   Carefully remove the side pillar trim to access the back of the switch and inspect the electrical connector for loose wires, backed-out pins, or corrosion.

3. 3

   Using a multimeter, check the signal voltage at the switch connector and verify continuity of the wiring harness between the side pillar switch and the Transmission Control Module (TRANS) to rule out an open circuit or a short to ground.

4. 4

   If available, use an AGCO diagnostic tool to monitor the live data state of the 4WD switch to see if the module registers the button press.

1. 1

   Preparation

   Park the tractor on a level surface, engage the parking brake, turn off the engine, and disconnect the battery to prevent electrical shorts.

2. 2

   Access the Switch

   Inside the cab, locate the 4WD switch on the right-hand side pillar. Carefully pry off the plastic trim panel surrounding the switch cluster using a non-marring plastic trim tool.

3. 3

   Disconnect

   Reach behind the 4WD switch and depress the locking tab on the wiring harness connector. Pull the connector free from the switch.

4. 4

   Remove the Faulty Switch

   Squeeze the retaining clips on the top and bottom (or sides) of the switch body and push it forward out of the trim panel.

5. 5

   Install the New Switch

   Push the new OEM 4WD switch into the mounting hole on the trim panel until the retaining clips click securely into place.

6. 6

   Reconnect

   Plug the wiring harness connector into the back of the new switch. Ensure it clicks and locks.

7. 7

   Reassembly

   Snap the side pillar trim panel back into its original position.

8. 8

   Testing

   Reconnect the battery. Start the tractor and press the 4WD button. Verify that the 4WD indicator light on the dashboard illuminates/extinguishes correctly and that the 05.00.31 fault code is cleared from the system.