Case IH 2670-02 - ACM – ACM: Joystick 1 X-Axis Lever Left Negative Position Status

The control module is receiving an invalid, out-of-range, or erratic electrical signal from the joystick's X-axis sensor when the lever is moved to the left (the negative travel side relative to the neutral position).

• MAGNUM AFS Connect
• Magnum Series (180, 200, 215, 220, 235, 240, 255, 275, 305, 335, 340)
• Steiger Series (280, 330, 335, 380, 385, 430, 435, 480, 485, 500, 530)
• STX Series (STX275, STX280, STX325, STX330, STX375, STX380, STX425, STX430, STX440)
• Maxxum Series

1. 1

   Verify the Armrest Control Module (ACM) configuration using a diagnostic tool, as an incorrect configuration can falsely trigger joystick axis voltage faults.

2. 2

   Remove the armrest cover and inspect the wiring harness and connectors between the joystick (Multi-Function Handle) and the ACM for pinched wires, loose pins, or corrosion.

3. 3

   Use a multimeter or diagnostic tool to monitor the live voltage of the Joystick 1 X-axis, verifying if the voltage drops too low or spikes too high when moved to the left.

4. 4

   Test for mechanical binding to ensure the joystick physically returns to the neutral position without obstruction and that internal return springs are intact.

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the battery to prevent electrical shorts during disassembly.

2. 2

   Access the Armrest Controls

   Remove the retaining screws and panels on the right-hand console/armrest to expose the ACM and the base of the joystick assembly.

3. 3

   Test the Circuit

   Disconnect the joystick harness. Check for continuity and verify that there is no short to ground or short to power in the X-axis signal wire leading back to the ACM.

4. 4

   Replace the Joystick

   If the wiring is intact but the X-axis sensor fails the voltage sweep test, the joystick sensor has failed. Replace the entire Multi-Function Handle (joystick) assembly.

5. 5

   Reassemble and Calibrate

   Install the new joystick and reconnect the harness. Reinstall the armrest panels and reconnect the battery.

6. 6

   Clear and Calibrate

   Use the tractor's AFS display or a diagnostic tool to clear the 2670-02 fault code. Perform a joystick calibration procedure to teach the ACM the new neutral, full-left, and full-right voltage limits of the replacement part.