New Holland 18046 – ACM: EHR Float Control Switch Error

The armrest control system has detected an electrical fault with the switch for the Electronic Hydraulic Remote (EHR) float function. This indicates an open circuit, short circuit, or out-of-range voltage signal from the switch, which affects the ability of the hydraulic implement to follow the contour of the ground without hydraulic pressure.

• T8 Series
• T6 Series
• T7 Series
• T8000 Series

1. 1

   Verify that 18046 is the active or stored fault code using the diagnostic display or Electronic Service Tool (EST) and note any accompanying codes.

2. 2

   Check the battery charge and ensure all main power and ground connections to the cab and controllers are clean and tight, as electronic systems are sensitive to low voltage.

3. 3

   Visually inspect the wiring harness and connectors associated with the armrest controller and EHR levers for damage, corrosion, loose connections, or broken wires.

4. 4

   Perform a calibration of the EHR levers and armrest controller. During calibration, verify the float position voltage value is approximately 0 mV.

1. 1

   Power down tractor

   Ensure the tractor is turned off and the battery is disconnected before beginning any electrical repairs.

2. 2

   Disassemble armrest

   Partially or fully disassemble the armrest console to access the EHR switches.

3. 3

   Replace float control switch

   Locate the specific float control switch for the malfunctioning EHR valve. Disconnect the electrical connector, remove the old switch, and install the new one securely.

4. 4

   Reassemble console

   Reassemble the armrest console.

5. 5

   Calibrate component

   Recalibrate the armrest controller and EHR levers using the instrument cluster display or EST so the system recognizes the new component and its operational parameters.

6. 6

   Clear fault codes

   After a successful calibration and functional check, clear all fault codes using the diagnostic menu or EST.