Case IH 4133 – EHR (Electro Hydraulic Remote) control module: Rear remote no. 3 - over voltage

The control system has detected that the voltage signal coming from the circuit of the number 3 rear electro-hydraulic remote (EHR) valve is higher than the expected maximum threshold. This is typically caused by a short to power in the wiring harness, a failed spool position potentiometer/transducer on the valve, or an internal fault within the controller.

• Magnum
• Maxxum
• Steiger T4B
• MAXXUM T4E
• Steiger
• Puma

1. 1

   Check for other active EHR codes using the tractor's display or an Electronic Service Tool (EST) to rule out a shared ground failure or main controller issue.

2. 2

   Inspect the wiring harness and the electrical connector at the Rear Remote No. 3 valve for physical damage, pinched wires, water intrusion, or corrosion.

3. 3

   Perform a swap test by exchanging the electrical connector from Rear Remote No. 3 with an adjacent known-good remote (e.g., No. 2 or No. 4) to isolate the fault to the valve or the wiring.

4. 4

   Use a multimeter to test the signal wire at the valve connector for a short to a 12V power source.

1. 1

   Power Down

   Turn off the tractor, remove the key, and disconnect the battery ground cable before performing electrical repairs.

2. 2

   Harness Repair

   If the diagnostic checks revealed a short to power in the wiring harness between the EHR controller and the remote valve, locate the chafed or melted section of the wire. Splice and solder in a new section of wire, seal it with heat-shrink tubing, and secure the harness away from pinch points.

3. 3

   Connector Replacement

   If the connector at the valve is corroded or internally shorted, cut off the old connector and wire in a new OEM pigtail connector. Apply dielectric grease to prevent future moisture intrusion.

4. 4

   Valve / Potentiometer Replacement

   If the swap test proved the valve itself is faulty, replace the spool position potentiometer (transducer cap) if available separately, or replace the entire EHR valve section for Remote No. 3.

5. 5

   Reassembly and Clearing Codes

   Reconnect all electrical connections and the battery. Turn the key on and use the EST or the tractor's diagnostic menu to clear the stored 4133 fault code.

6. 6

   Calibration

   If a new EHR valve section or controller was installed, perform an EHR valve calibration procedure using the EST so the controller can learn the neutral, extend, and retract voltage parameters of the new valve.