Case IH 4543 – EHR (Electro-Hydraulic Remote) Controller: Front remote No. 4 - Control message not plausible

The control module is receiving a signal from the front remote #4 control lever (potentiometer) or via the CAN bus that is erratic, out of the expected voltage range, or does not match the expected operational parameters.

• Puma/Mid Range Magnum
• MAXXUM T4E
• Case IH Puma Series (165, 180, 195, 210, 225 CVX)
• Case IH Maxxum Series (100, 110, 115, 120, 125, 130, 140 Multicontroller)
• Case IH Magnum Series
• Case IH Steiger 4WD Tractors

1. 1

   Monitor potentiometer readings using the onboard diagnostic display (H-Menu) or Electronic Service Tool (EST) to ensure the signal changes smoothly without dropping out or spiking

2. 2

   Inspect the wiring harness and connectors between the armrest control lever/joystick and the EHR controller for pinched wires, chafing, or loose/corroded pins

3. 3

   Check for related fault codes (e.g., 4542, 4546, or 4547) that might indicate a broader electrical or CAN bus issue

4. 4

   Attempt to run the Electro-Hydraulic Remote Valve Lever Calibration procedure to correct a drifted sensor

1. 1

   Power Down

   Turn off the tractor, remove the key, and disconnect the battery if you will be repairing wiring or replacing electronic components.

2. 2

   Access the Control Console

   Remove the necessary trim panels on the armrest or side console to access the electro-hydraulic remote control levers/joystick.

3. 3

   Wiring Repair

   If your diagnostic checks revealed damaged wiring or poor pin fitment at the connector for remote #4, repair the harness or replace the connector pigtail.

4. 4

   Replace the Potentiometer/Lever

   If the wiring is intact but the signal is still implausible (or calibration fails), the potentiometer inside the lever assembly has failed. Remove the retaining hardware for the front remote #4 lever/switch assembly, disconnect the electrical plug, and install the replacement unit.

5. 5

   Reassembly

   Reinstall the armrest trim and reconnect the battery.

6. 6

   Recalibrate

   Perform the Electro-Hydraulic Remote Valve Lever Calibration procedure. This allows the EHR controller to learn the new potentiometer's exact neutral, maximum extend, and maximum retract voltage values.

7. 7

   Clear and Test

   Clear the stored fault codes and test the operation of the front remote #4 to ensure the code does not return.