Case IH 18055 – ACM (Armrest Control Module): Joystick 2 X-axis position - voltage too low (not applicable to CCM/APH _it may indicate incorrect configuration of the ACM)

The control module is receiving a voltage signal from the X-axis potentiometer/sensor of Joystick 2 that is below the acceptable minimum threshold (often indicating a short to ground, an open circuit, or a failed sensor). This error can also be triggered by an incorrect software configuration within the control module.

• Magnum
• Steiger T4B
• Case IH Magnum Series
• Case IH Puma Series
• Case IH Steiger Series
• Case IH Maxxum Series

1. 1

   Verify ACM configuration using the Electronic Service Tool (EST) or Pro 700 display to ensure it matches installed hardware

2. 2

   Inspect wiring and connectors (H4 on armrest controller, H14 on EDC Panel, H13 on Control Lever 2) for pushed pins, corrosion, or moisture

3. 3

   Test the X-axis signal circuit for a short to ground (0V) or an open circuit using a multimeter

4. 4

   Verify the joystick is receiving the correct 5V or 8V reference voltage from the ACM

1. 1

   Check ACM configuration

   Connect the diagnostic service tool to the tractor and check the ACM configuration settings. If the configuration is incorrect (e.g., looking for a joystick that isn't installed or configured for the wrong axis type), reconfigure the ACM and clear the code.

2. 2

   Access wiring

   If the configuration is correct, power down the tractor and remove the armrest control panel covers to access the joystick and ACM wiring.

3. 3

   Perform continuity test

   Disconnect the harness at Joystick 2 and at the ACM. Perform a continuity test on the X-axis signal wire, the ground wire, and the reference voltage wire.

4. 4

   Repair wiring

   Repair any damaged wiring or replace the harness if a short to ground or open circuit is found.

5. 5

   Replace joystick

   If the wiring tests good and the reference voltage is present, the X-axis potentiometer inside the joystick has failed. Replace the Joystick 2 / Multi-Function Handle assembly.

6. 6

   Calibrate joystick

   Reassemble the armrest, power on the tractor, and perform any necessary joystick calibration procedures via the display monitor to ensure the new X-axis center and limits are learned.