New Holland 4118 – EHR: Remote Control Valve 2 Voltage Drop

The electronic control system has detected a voltage level below the normal operating range for the No. 2 rear electronic hydraulic remote (EHR) valve. This voltage drop indicates an issue with the electrical supply to the solenoid that controls the valve, which can impair or completely disable the proper operation of the component. Temporary glitches, such as sudden voltage drops in the system, can sometimes trigger this fault code.

• T7.170
• T7.220
• T7.260
• T7.270

1. 1

   Check the tractor's battery and charging system to ensure overall system voltage is sufficient, as low system voltage can trigger module under-voltage faults.

2. 2

   Inspect the wiring harness and connectors leading to the No. 2 remote valve solenoid for chafing, pinched wires, corrosion on pins, dust, or moisture.

3. 3

   Disconnect and reconnect the electrical connector for the No. 2 remote valve to ensure a clean, secure connection. Ensure the connector is clean and free of debris or moisture.

4. 4

   Review the fault code history for other active codes (such as CAN bus communication errors or sensor supply voltage codes like 187) that might indicate a broader electrical issue.

5. 5

   Swap the electrical solenoid from the No. 2 valve with a known good valve of the same type to see if the fault follows the solenoid or stays with the No. 2 position.

1. 1

   Repair wiring and connectors

   If any wiring or connector damage was found during the visual inspection, repair or replace the affected components. Clear the fault codes and operate the remote valve to see if the issue is resolved.

2. 2

   Test the solenoid

   Using a multimeter, measure the resistance of the solenoid coil and compare it to a known good solenoid to check for an open circuit (infinite resistance) or short circuit (very low resistance). If accessible and safe, perform a 'click test' by applying the correct voltage directly to the solenoid to verify actuation.

3. 3

   Test the wiring harness

   Disconnect the harness from both the control module and the valve solenoid. Use a multimeter to verify continuity on the power and ground wires from the controller connector to the solenoid connector. Check for any continuity between the power wire and chassis ground, which indicates a short circuit.

4. 4

   Calibrate the valve

   If the valve or solenoid was replaced, perform a calibration procedure. This is typically initiated through the tractor's instrumentation or the New Holland Electronic Service Tool (EST). Some systems may allow valves to operate without calibration for testing purposes.

5. 5

   Diagnose the control module

   If the solenoid and wiring test good, the fault may lie within the electronic control module (EHR or ARU) that drives the valve. This is the least common cause and the most expensive to fix. Use dealer-level diagnostic tools to monitor live data and command the valve's operation to confirm module failure.