Case IH 51412 – Auxiliary Valve Controller (AUX67 or AUX89) or Tractor Multi-Function (TMF) / Armrest Controller (ARU): Implement feedback #2 out of range High

The feedback sensor for Implement #2 (which can be an auxiliary remote valve potentiometer, a hitch position sensor, or a 3-point hitch draft pin sensor) is sending a voltage signal to the controller that is above the normal operating parameters, typically indicating a short to a power source, an open ground circuit, or an internal failure of the sensor itself.

• MX Magnum
• Case IH MX Series
• Case IH TG Series
• Case IH Magnum Series (MX180-MX285, Magnum 215-340, 7100-8900 series)
• Case IH Steiger
• Case IH Puma

1. 1

   Visually inspect the Implement #2 feedback sensor (draft pin or remote valve potentiometer), wiring harness, and connector for physical damage, corrosion, or pushed-out pins.

2. 2

   Test the ground circuit by disconnecting the sensor and using a multimeter to check for continuity to the chassis (an open ground is the most common cause of an out-of-range high code).

3. 3

   Test the signal wire to ensure it is not shorted to a 12V or 5V power source within the wiring harness.

4. 4

   Verify that the sensor is receiving the correct 5V reference voltage from the controller.

5. 5

   If applicable, swap the Implement #1 and #2 sensors. If the fault code changes to Implement #1 (e.g., 51402), the sensor has failed internally. If it remains 51412, the issue is in the wiring harness or controller.

1. 1

   Power Down

   Turn off the tractor, remove the key, and disconnect the battery to prevent electrical spikes.

2. 2

   Access the Sensor

   Locate the faulty Implement #2 feedback sensor. If it is a draft pin, it will be located at the lower link arms of the 3-point hitch. If it is a remote valve potentiometer, it will be on the rear hydraulic remote valve stack.

3. 3

   Remove the Sensor

   Disconnect the electrical harness. Remove the retaining bolts, snap rings, or locking hardware holding the sensor or draft pin in place. Slide the faulty component out.

4. 4

   Install the New Part

   Clean the mounting area. Insert the new sensor/pin and secure it with the retaining hardware.

5. 5

   Reconnect

   Plug the wiring harness back into the sensor. Ensure the connector clicks and locks securely.

6. 6

   Re-energize and Clear Codes

   Reconnect the battery and turn the ignition on. Use the tractor's display monitor to clear the inactive fault codes.

7. 7

   Calibration

   You must perform a Hitch Controller Calibration or Remote Valve Calibration procedure via the tractor's display monitor. This teaches the controller the new sensor's minimum and maximum voltage limits.