New Holland 18056 – ACM: Control Lever 2 X-Axis Increased Voltage

The Armrest Control Module (ACM) has detected that the voltage on the signal wire for the X-axis (left-right movement) of Control Lever 2 is above the maximum expected threshold. This very high voltage condition typically indicates a short circuit to a power source (such as a 5V or 12V supply) in the wiring harness or a complete failure of the joystick's internal potentiometer, preventing the controller from accurately determining operator commands.

• T7.170
• T7.185
• T7.200
• T7.210
• T7.220
• T7.235
• T7.250
• T7.260
• T7.270
• T8.275
• T8.300
• T8.360
• T8.390
• T8.420
• T9.505

1. 1

   Record and clear fault codes, then operate the joystick to see if code 18056 returns immediately.

2. 2

   Visually inspect the wiring harness running to the armrest and joystick for pinching, chafing, or damage. Wiggle the harness while the system is on to check for intermittent faults.

3. 3

   Disconnect and inspect the electrical connectors at the base of the joystick and at the Armrest Control Module for corrosion, bent pins, or moisture intrusion.

4. 4

   Test for a short to power in the harness: With the joystick disconnected and key ON, measure DC voltage on the X-axis signal wire. Significant voltage (5V or 12V) indicates a harness short.

5. 5

   Test the joystick potentiometer: Measure total resistance across the outer terminals (supply and ground), then measure resistance between the center wiper and outer terminals while sweeping the joystick left to right. Look for smooth changes without erratic jumps or drop-offs.

1. 1

   Disconnect power

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

2. 2

   Access the joystick

   Remove the necessary armrest covers and panels to gain access to the joystick's mounting hardware and electrical connector.

3. 3

   Remove faulty joystick

   Unbolt the old joystick assembly from the armrest console and disconnect its electrical harness.

4. 4

   Install new joystick

   Mount the new joystick assembly, ensuring it is securely fastened, and connect the electrical harness.

5. 5

   Reassemble and reconnect power

   Reinstall all armrest panels and covers, then reconnect the battery.

6. 6

   Calibrate the new joystick

   Perform the joystick calibration procedure through the tractor's onboard display service menu by moving the joystick to its full extents in the X and Y axes.