Case IH 520626-02 - ACM – ACM: Multi function handle shuttle reverse switch circuit fault.

The system has detected a circuit malfunction (such as an open circuit, short to ground, or voltage out of range) specifically on the shuttle reverse switch circuit located on the Multi-Function Handle (MFH). This switch is responsible for commanding the tractor's transmission into reverse.

• MAGNUM AFS Connect
• Magnum Series
• Magnum 260
• Magnum 290
• Magnum 315
• Magnum 340
• Magnum 400
• Steiger Series
• Puma Series
• Maxxum Series

1. 1

   Ensure the tractor is powered down and disconnect the negative battery cable to prevent shorting components.

2. 2

   Locate and inspect Connector X846 on the Multi-Function Handle Electronic Module (A-032), which houses the wiring for the Shuttle Reverse Switch (S-111).

3. 3

   Check the wiring between the S-111 Shuttle Reverse Switch and the Armrest Control Module for continuity, chafing, or pinched wires inside the armrest assembly.

4. 4

   Verify if other buttons on the Multi-Function Handle are operating correctly to rule out a disconnected module or a shared ground/power failure.

1. 1

   Park and disconnect battery

   Park the machine on a level surface, turn off the engine, and disconnect the negative battery cable.

2. 2

   Disassemble armrest console

   Disassemble the armrest control console to access the Armrest Control Module (ACM) and the base of the Multi-Function Handle.

3. 3

   Disconnect connector

   Disconnect connector X846 from the Multi-Function Handle Electronic Module.

4. 4

   Inspect pins

   Inspect the pins on both the handle side and the harness side for corrosion, pushed-out pins, or damage.

5. 5

   Replace MFH assembly

   If the wiring harness tests good but the shuttle reverse switch fails to close/open the circuit when toggled, the internal switch has failed. Because individual switches inside the MFH are generally not serviced separately, the entire Multi-Function Handle (Joystick) assembly must be replaced.

6. 6

   Install replacement handle

   Remove the retaining hardware for the MFH and install the replacement handle.

7. 7

   Reassemble console

   Reconnect connector X846 and reassemble the armrest console.

8. 8

   Test function

   Reconnect the negative battery cable, power on the tractor, and test the shuttle reverse function to ensure the fault code 520626-02 moves to an inactive state and clears.