Case IH 18041 – Armrest Controller: EHR 1 lever position - voltage too high

The control module is receiving a voltage signal from the #1 remote valve control lever's position sensor (potentiometer) that exceeds the maximum expected threshold. This condition is typically caused by a short to power, an open ground circuit in the wiring harness, or an internally failed potentiometer.

• Magnum
• Steiger T4B
• Magnum Series
• Steiger Series
• Puma Series

1. 1

   Check for Multiple Codes: Verify if there are other EHR-related error codes present. If multiple levers are throwing voltage too high codes simultaneously, the issue is likely a shared 5V reference short or a shared ground failure in the armrest harness rather than a single bad lever.

2. 2

   Clear and Retest: Make a note of the error code, clear it from the system, and test the remote valve for normal operation to see if the code returns.

3. 3

   Wiring & Connector Inspection: Inspect the wiring harness and connectors between the EHR 1 lever and the Armrest Controller. Look for pinched wires, corrosion, or loose pins that could cause an open ground or a short to a power source.

4. 4

   Potentiometer Sweep Test: Use a multimeter to monitor the voltage output of the EHR 1 lever potentiometer while moving it through its full range of motion. The voltage should scale smoothly without spiking out of range.

1. 1

   Attempt Calibration

   Perform the EHR lever calibration procedure via the tractor's display monitor. Sometimes, a loss of calibration parameters can cause the controller to read the lever's resting voltage as out of bounds.

2. 2

   Software Update

   If the lever was recently calibrated or replaced, verify the controller has the correct software level. If necessary, download the correct software and repeat the calibration.

3. 3

   Harness Repair

   If the multimeter test reveals a short to power or an open ground in the armrest wiring, repair or replace the affected section of the wiring harness.

4. 4

   Replace the Lever/Potentiometer

   If the wiring is intact but the potentiometer fails the sweep test (or physically binds/fails), remove the armrest console cover and replace the EHR 1 lever assembly or its dedicated potentiometer.

5. 5

   Recalibrate

   After replacing any EHR lever or potentiometer, you must perform the EHR lever calibration procedure before the system will operate normally.