New Holland 3733 – Engine Control Unit (ECU) / Electronic Diesel Control (EDC): PTO switch : Diagnostic fault check for min error of COM message

This code indicates a communication failure or an implausible signal regarding the Power Take-Off (PTO) switch. The controller is detecting a minimum error threshold in the CAN bus (COM) messaging from the PTO switch circuit, meaning the ECU is either losing the signal from the switch or receiving a voltage/resistance value that falls below the minimum expected parameters.

• T6000 series
• T7 series
• TS series
• TS90
• TS100
• TS110
• TS115
• TM series
• TM110-TM190
• TL series
• TN series
• Workmaster series
• Boomer series

1. 1

   Inspect the PTO switch on the side console or dash for physical damage, sticking, or fluid ingress.

2. 2

   Access the back of the PTO switch and inspect the electrical connector for pushed-out pins, corrosion, or moisture.

3. 3

   Trace the wiring harness from the PTO switch to the ECU. Test for continuity, shorts to ground, or open circuits in the CAN communication lines.

4. 4

   Use a multimeter to test the internal resistance and continuity of the PTO switch in both the engaged and disengaged positions to verify it is sending the correct state signals.

1. 1

   Power Down

   Turn off the tractor and disconnect the negative battery cable to prevent electrical shorts and ECU damage.

2. 2

   Access the Switch

   Carefully pry up or unscrew the side console trim panel or dashboard bezel where the PTO switch is mounted.

3. 3

   Disconnect

   Unplug the wiring harness connector from the back of the faulty PTO switch.

4. 4

   Remove the Switch

   Depress the retaining tabs on the sides of the switch body and push it out through the front of the console panel.

5. 5

   Install the New Switch

   Snap the new OEM PTO switch into the console panel until the retaining tabs click into place.

6. 6

   Reconnect

   Plug the wiring harness connector into the new switch, ensuring the locking tab engages securely.

7. 7

   Reassemble

   Reinstall the console trim panel or dashboard bezel.

8. 8

   Clear Codes

   Reconnect the battery. Connect a diagnostic tool (such as the CNH E.A.S.Y. system) to the tractor's diagnostic port and clear the 3733 fault code.

9. 9

   Test Operation

   Start the tractor and test the PTO engagement and disengagement to ensure the code does not return.