Case IH 520625-02 - ACM – ACM: ACM: Multi function handle shuttle forward switch circuit fault

This indicates an electrical circuit malfunction (such as an open circuit, short to ground, or erratic voltage) specifically affecting the S-110 Shuttle Forward Switch located on the tractor's joystick. When this code is active, the tractor may fail to register forward directional commands from the multi-function handle.

• MAGNUM AFS Connect
• Puma series
• Magnum series (215, 260, 290)
• Steiger series

1. 1

   Inspect the wiring harness and connectors between the Multi-Function Handle (MFH) and the Armrest Controller for pinched wires, chafing inside the armrest pivot points, or loose pins.

2. 2

   Test the S-110 Shuttle Forward Switch for proper continuity to verify that the switch transitions smoothly without erratic resistance spikes when pressed.

3. 3

   Verify the 5V/9V reference voltage and sensor ground supplied by the ACM to the multi-function handle. A drop in voltage could trigger switch circuit faults.

4. 4

   Check for accompanying codes (such as the S-111 Shuttle Reverse Switch or general MFH voltage errors). If multiple switch codes are present, the issue is likely a shared ground or a failed Armrest Controller rather than the switch itself.

1. 1

   Power Down

   Turn off the ignition and disconnect the negative battery cable to protect the electronic modules.

2. 2

   Access the Armrest

   Remove the retaining screws and carefully lift the upper plastic housing of the Multicontroller armrest to expose the internal wiring and the base of the joystick.

3. 3

   Disconnect the MFH

   Unplug the main electrical connector linking the Multi-Function Handle to the Armrest Controller harness.

4. 4

   Replace the Component

   Depending on the specific handle revision, the shuttle switches may be integrated into the joystick circuit board. If the S-110 switch cannot be serviced individually, remove the mounting bolts at the base of the joystick and replace the entire Multi-Function Handle assembly.

5. 5

   Reassembly

   Mount the new handle, reconnect the electrical harness, and ensure the wiring is routed away from pinch points. Reinstall the armrest cover.

6. 6

   Calibration & Testing

   Reconnect the battery. Turn the key on, clear the stored fault codes via the Pro 700/Pro 1200 display, and test the forward shuttle command to ensure the transmission engages properly.