New Holland 3732 – EDC: PTO switch : Diagnostic fault check for max error of COM message

This fault indicates a communication or signal error originating from the Power Take-Off (PTO) switch. The Engine Control Unit (EDC) has detected that the communication (COM) message or signal voltage from the PTO switch has exceeded the maximum expected threshold, or there is a loss of valid CAN bus data and plausibility from the switch.

• T-series
• TS
• TM
• TL
• TN
• Workmaster
• Farmall
• Boomer
• 40 series
• 60 series

1. 1

   Inspect the PTO switch on the console or armrest for physical damage, sticking, or a sloppy/loose feeling when engaged.

2. 2

   Check the wiring harness and connectors between the PTO switch and the ECU for corroded pins, loose connections, open circuits, or wires shorted to battery/ground.

3. 3

   Test the PTO switch for proper continuity and resistance in both the 'ON' and 'OFF' positions using a digital multimeter.

4. 4

   Verify the CAN bus communication lines (if it is a networked switch) or the analog voltage supply to the switch, ensuring there are no blown fuses or poor ground connections.

5. 5

   Monitor the live data state of the PTO switch using a CNH diagnostic tool (such as the E.A.S.Y. system) and clear the code to see if it actively returns upon switch actuation.

1. 1

   Prepare machine

   Turn off the tractor engine, remove the key, and disconnect the negative battery cable to prevent electrical shorts.

2. 2

   Locate switch

   Locate the PTO switch on the operator's right-hand console, dashboard, or armrest.

3. 3

   Access switch assembly

   Carefully pry up the console trim panel or remove the retaining screws to access the underside/rear of the switch assembly.

4. 4

   Disconnect wiring

   Disconnect the electrical wiring harness connector from the back of the PTO switch.

5. 5

   Remove faulty switch

   Depress the plastic retaining tabs (or remove the mounting nut, depending on the model) to push the faulty switch out of the panel.

6. 6

   Insert new switch

   Insert the new PTO switch into the panel until the retaining tabs click securely into place.

7. 7

   Reconnect wiring

   Reconnect the electrical wiring harness to the new switch.

8. 8

   Reinstall panel

   Reinstall the console trim panel and secure it.

9. 9

   Reconnect battery

   Reconnect the negative battery cable.

10. 10

    Clear code and test

    Turn the ignition on, use a diagnostic tool to clear fault code 3732, and test the PTO engagement to verify the repair.