Case IH 18056 – Armrest Control Module (ACM): Joystick 2 X-axis position sensor voltage signal too high

Joystick 2 X-axis position sensor is sending a voltage signal that is too high (above the acceptable upper limit). This typically points to a short to power (12V) or an open ground circuit in the sensor or wiring. If the tractor is not physically equipped with a second joystick, it indicates incorrect configuration of the ACM.

• Magnum
• Steiger T4B
• Case IH Magnum (235-340 Series 4, AFS Connect)
• Case IH Steiger (350-600)
• Case IH Puma (150, 165, 180, 195, 210, 225 CVX)
• Case IH Maxxum series
• Case IH Optum series

1. 1

   Verify Machine Configuration: Check if the tractor is actually equipped with a second joystick. If it is not, the issue is purely software-related.

2. 2

   Check ACM Configuration: Use the Electronic Service Tool (EST) to verify the Armrest Control Module configuration settings.

3. 3

   Inspect Connectors: If the joystick is present, inspect the H4, H13, and H14 connectors on the EDC panel and Integrated Control Panel (ICP) for damaged pins, corrosion, or loose connections.

4. 4

   Test Wiring: Test the X-axis signal wire between Joystick 2 and the ACM for a short to 12V power or an open ground circuit.

5. 5

   Check for Related Codes: Look for other active ACM error codes (such as 18057 or 18058 for the Y-axis), clear the codes, and test the system for normal operation to see if the code returns.

1. 1

   Connect diagnostic tool

   Connect the Electronic Service Tool (EST) to the tractor's diagnostic port.

2. 2

   Update ACM configuration

   If Joystick 2 is NOT installed: Navigate to the Armrest Control Module (ACM) configuration menu. Update the software configuration to indicate that Joystick 2 is not present. Save the configuration, cycle the key, and clear the fault code.

3. 3

   Test X-axis signal wire

   If Joystick 2 IS installed: Disconnect the harness at the joystick and at the ACM. Use a multimeter to check the X-axis signal wire for a short to power (12V).

4. 4

   Repair wiring harness

   Repair or replace the wiring harness if a short or open circuit is found.

5. 5

   Replace Joystick 2 assembly

   If the wiring harness and connectors test good, the internal X-axis potentiometer/sensor inside the joystick has failed. Replace the Joystick 2 assembly.

6. 6

   Verify repair

   Reconnect all components, clear the fault code using the EST, and operate the joystick through its full X-axis range of motion to verify the repair.