New Holland NH 4143 – EHR (Electro-Hydraulic Remote) Controller / Primary Hydraulic Power System: Remote No.4 Control Message not plausible

Communication or logic error where the control module is receiving erratic, corrupted, or illogical CAN bus signals from the #4 electro-hydraulic remote (EHR) valve.

• T6
• T7
• T8
• T9
• TM series
• T5040-T5070
• TS-A series
• SP280/SP480 sprayers
• Magnum
• Maxxum
• Steiger
• MXU series

1. 1

   Inspect the CAN bus wiring harness and the electrical connector going directly to the #4 remote valve for corrosion, backed-out pins, or chafed wires.

2. 2

   Check for low hydraulic fluid levels, air in the lines, or contaminated fluid which can cause internal valve sticking.

3. 3

   Use the New Holland Electronic Service Tool (EST) or the tractor's in-cab display to monitor live data from the #4 valve and attempt to run the valve calibration procedure.

4. 4

   Verify that the in-cab EHR switch for the #4 valve is functioning correctly and not sending conflicting voltage signals to the controller.

1. 1

   Relieve Pressure

   Safely shut down the machine and relieve all hydraulic system pressure before servicing the valve stack.

2. 2

   Remove the Faulty Valve

   Disconnect the electrical harness from the #4 remote valve. Unbolt the #4 valve section from the rear remote valve stack.

3. 3

   Install the New Valve

   Install the replacement EHR valve section, ensuring all O-rings and seals are properly seated between the valve slices. Torque the tie-bolts to OEM specifications and reconnect the electrical harness.

4. 4

   Reprogram the Valve Number

   Use the tractor's display or the EST diagnostic tool to program the new valve's internal processor to identify itself as 'Valve No. 4'.

5. 5

   Calibrate the Valve

   Once numbered, initiate the electro-hydraulic valve calibration process via the tractor's display to teach the system the new valve's neutral, extend, and retract spool limits.

6. 6

   Test Operation

   Start the tractor, check for leaks, and verify that fault code NH 4143 has cleared and the remote operates smoothly.