New Holland 18030 – ACM: EHR Lever 6 Voltage Too High

The Armrest Control Module (ACM) has detected a voltage from the number 6 Electronic Hydraulic Remote (EHR) lever that is above the expected maximum threshold. This indicates that the signal voltage sent by the potentiometer within the EHR 6 lever to the ACM is excessively high, which can be caused by a short circuit to a power source in the signal wire, a faulty potentiometer, or an incorrect software configuration within the Armrest Control Module.

• T7 Series
• T7.210
• T7.220
• T7.235
• T7.250
• T7.260
• T7.270
• T8 Series
• T8.275
• T8.300
• T8.330
• T8.360
• T8.390
• T9 Series
• TG Series
• TG245

1. 1

   Verify the configuration of the Armrest Control Module (ACM) is correct

2. 2

   Check tractor battery voltage and ensure main chassis and control module ground connections are clean and tight

3. 3

   Inspect the wiring harness leading to the armrest controller and the specific EHR lever for damage, chafing, corrosion, or broken wires, especially at pivot points

4. 4

   Ensure all connectors related to the armrest control module and the EHR valve are securely seated and check for poor pin connections

1. 1

   Attempt EHR Lever Calibration

   Access the tractor's diagnostic menu on the A-post or main display to perform a calibration of the EHR levers. This re-learns the neutral, extend, and retract positions of the lever's potentiometer.

2. 2

   Test the EHR Lever Potentiometer

   If calibration fails, use a multimeter to measure the resistance between the signal wire and ground on the potentiometer. Look for a smooth change in resistance as the lever moves; sudden jumps or open circuits indicate a faulty potentiometer.

3. 3

   Inspect for Internal Armrest Issues

   If external wiring is intact, disassemble the armrest assembly to inspect the controller's circuit board for shorted filter caps or broken solder joints.

4. 4

   Component Replacement

   Replace the EHR lever/potentiometer, the hydraulic spool position sensor, or the Armrest Control Module (ACM) depending on which component failed the previous diagnostic tests.