New Holland 4118 – ARU: Remote No.2 Under Voltage

The control system has detected an under-voltage condition in the circuit for the second rear electro-hydraulic remote valve. This below-minimum voltage prevents the proper activation and function of the hydraulic remote, potentially leaving it inoperable. This indicates an electrical fault rather than a mechanical or hydraulic failure.

• T5 Series
• T6 Series
• T7 Series
• T7 AutoCommand
• T7 Power Command
• T7 Range Command
• TM Series
• TSA Series

1. 1

   Check overall system voltage to ensure the battery is fully charged and the alternator is functioning correctly, as a battery voltage below 12.1V can be a source of ghost codes

2. 2

   Inspect all relevant fuses for the hydraulic and armrest control systems

3. 3

   Inspect the main ground strap to the chassis to ensure it is clean, tight, and free of corrosion

4. 4

   Visually inspect the wiring harness leading to the No. 2 remote valve solenoid for chafing, cuts, or heat damage. Pay close attention to the connectors at both the solenoid and the controller for loose pins, corrosion, or moisture intrusion, as well as wiring and connectors under the cab or near the armrest

5. 5

   Determine if the code is active (present now) or stored (occurred in the past) using the tractor's diagnostic display or an external diagnostic tool to identify intermittent faults

1. 1

   Prepare machine for service

   Ensure the tractor is on level ground, parking brake engaged, and engine off. Disconnect the battery to prevent electrical shorts and relieve any residual pressure in the hydraulic system.

2. 2

   Locate the No. 2 remote valve

   Identify the No. 2 rear electro-hydraulic remote valve solenoids mounted on the hydraulic valve block at the rear of the tractor (typically the second from one side).

3. 3

   Test the solenoid

   Disconnect the wiring harness from the solenoid. Measure resistance across the two pins of the coil using a multimeter. Compare to a known good solenoid; a reading of 'OL' indicates an open circuit, while near zero indicates a short circuit.

4. 4

   Test the wiring harness

   With the solenoid and the controller end disconnected (if accessible), perform a continuity test on each wire in the harness for the No. 2 remote to check for breaks. Check for shorts to ground (wire to chassis) and shorts between wires.

5. 5

   Perform a voltage test

   Reconnect the battery and harness. Carefully back-probe the connector at the solenoid while an assistant activates the No. 2 remote from the cab. A reading significantly below system voltage (e.g., below 12V with the engine running) confirms the under-voltage condition at the component.

6. 6

   Replace faulty components

   Replace the solenoid if it tests faulty, or repair/replace damaged wiring. If both are good, the Armrest Control Unit (ARU) may be faulty and require advanced diagnostics before replacement.