New Holland 4114 – EHR: Rear Remote No. 2 No Control Message

The main armrest controller has lost CAN bus communication with the electronic control module for the number 2 rear electro-hydraulic remote (EHR) valve. The system is not receiving the expected control messages to command the valve's operation, indicating an electrical or communication failure rather than a hydraulic issue.

• T7 Series
• T7.210
• T7000
• T6000
• T8030
• TM175
• TM190

1. 1

   Ensure the battery is fully charged and connections are clean and tight, as low voltage can cause electronic faults

2. 2

   Check all relevant fuses for the armrest controller and EHR system

3. 3

   Visually inspect the wiring harness leading to the rear remote valve stack for chafing, pinching, corrosion, or loose connections

4. 4

   Inspect connectors at the armrest controller and the #2 remote valve, paying close attention to the plug on the right-hand side under the cab above the battery box

5. 5

   Check for broken or 'stretchy' wires within the harness near the plug, which indicates an internal break

6. 6

   Perform a CAN Bus termination resistance check with ignition off and battery disconnected (should read approximately 60 Ohms between CAN High and CAN Low; 120 Ohms suggests a missing resistor or open circuit, and significantly lower indicates a short circuit)

7. 7

   Check resistance to ground from CAN High and CAN Low wires (should be open circuit/mega-ohms)

8. 8

   Perform a powered voltage check on CAN lines (CAN High: 2.5-3.0 VDC, CAN Low: 2.0-2.5 VDC)

1. 1

   Address basic electrical issues

   Repair any damaged wires or clean corroded connectors found during the visual inspection. Ensure all connections are secure.

2. 2

   Isolate CAN bus fault

   If the CAN bus resistance reading is incorrect (e.g., 120 Ohms), disconnect modules one by one to observe resistance changes and pinpoint the open circuit or faulty terminator.

3. 3

   Swap control modules

   If another identical remote valve is present, swap the electronic control modules between remote #2 and a known working remote. If the fault code follows the module, the module is faulty. If it stays with remote #2, the wiring is at fault.

4. 4

   Repair or replace harness

   If a wiring issue is confirmed, repair the specific damaged section or replace the relevant remote valve wiring harness.

5. 5

   Replace faulty components

   Replace the faulty electronic module on the valve or the armrest controller if diagnostics confirm they have failed.