Massey Ferguson 06.01.02 – TRANS1: Issue With Signal From Right External Rear PTO On/Off Button

The controller is detecting an invalid, missing, or shorted signal from the PTO switch located on the right rear mudguard/fender. When active, the external PTO button will not function and the PTO will disengage. As a failsafe, the PTO can only be switched on or off using the main cab button by pressing and holding it for at least 5 seconds.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)

1. 1

   Perform an in-cab override test by holding the main cab PTO button for 5 seconds to verify the PTO engages, isolating the issue to the external switch circuit.

2. 2

   Visually inspect the right rear mudguard PTO switch for physical damage, cracked rubber seals, or water ingress.

3. 3

   Unplug the connector at the back of the switch and check for corrosion, bent pins, or moisture.

4. 4

   Perform a continuity test on the switch using a multimeter (normally closed configuration); verify it shows continuity at rest and breaks continuity when pressed.

1. 1

   Isolate Power

   Disconnect the tractor's battery to prevent electrical arcing or accidental PTO engagement.

2. 2

   Access the Switch

   Locate the faulty PTO switch on the right rear mudguard/fender.

3. 3

   Disconnect Wiring

   Unplug the electrical harness connector from the back of the switch.

4. 4

   Remove the Switch

   Remove the retaining hardware or bezel securing the switch to the mudguard and pull the switch out.

5. 5

   Install the New Switch

   Insert the replacement switch into the mudguard housing. Ensure the weather-sealing rubber boot is properly seated to prevent future water ingress.

6. 6

   Reconnect Wiring

   Plug the electrical connector into the new switch. Route the wiring neatly and secure it to prevent chafing against the fender or tire.

7. 7

   Test Operation

   Reconnect the battery. Test the PTO engagement using both the in-cab button and the newly installed right external button to ensure the fault code has cleared and normal operation is restored.