New Holland EHR 4334 – EHR (Electronic Hitch/Hydraulic Remote) module: Rear Remote No.8 -Over Voltage

This code indicates that the voltage signal associated with the No. 8 electro-hydraulic rear remote valve circuit is exceeding the expected normal operating range. This is typically caused by a short to power, a faulty charging system, or an internal failure within the valve's proportional solenoid/potentiometer.

• New Holland T8.xxx Series
• New Holland T8.275
• New Holland T8.300
• New Holland T8.360
• New Holland T8.390
• New Holland T8.420
• New Holland T9 Series
• New Holland T9.390
• New Holland T9.450
• New Holland T9.560
• New Holland T9.615
• New Holland T9.670

1. 1

   Verify that the tractor's alternator/charging system is not overcharging and that no external power supplies (like a 24V jump-start) are creating a system-wide over-voltage condition.

2. 2

   Inspect the EHR valve connector at the No. 8 remote, the extension harness connector, and the central controller (XCM) connector. Ensure they are tightly connected, undamaged, and that no pins are pushed out or corroded.

3. 3

   Test the wiring harness for a short to a 12V power source.

4. 4

   Measure the resistance across the CAN BUS circuit and check the terminating resistor to ensure network integrity.

5. 5

   Test the No. 8 remote valve's proportional solenoid and internal potentiometer for internal shorts.

1. 1

   Resolve Electrical Faults

   Repair any damaged wiring or connectors found during the diagnostic phase. If the over-voltage is isolated to an internal short inside the No. 8 valve actuator, the valve section must be replaced.

2. 2

   Clear Codes

   Once the physical repair is made, use the tractor's diagnostic menu (via the IntelliView display) to clear the active fault codes.

3. 3

   Address Assignment

   If a new CAN-based EHR valve was installed, the correct address must be assigned to it through the tractor's configuration menu.

4. 4

   Valve Calibration

   The new EHR valve must be calibrated prior to use. Connect the special calibration tool (OEM Tool #380001903) to the quick coupler on the remote bank. Initiate the calibration sequence via the tractor instrumentation. Note: If calibration fails the first time, stroke the valve back and forth manually to clear any trapped debris or air, then attempt the calibration again.