Case IH 518666-00 - ACM – ACM: Mouse disconnected while powered on

Fault code 518666-00 indicates an issue with the 'mouse' or encoder dial on the tractor's Multicontroller armrest, specifically that the mouse was disconnected while powered on.

• MAGNUM AFS Connect
• Steiger AFS Connect
• Quadtrac AFS Connect
• Optum AFS Connect

1. 1

   Verify the physical wiring harness connection to the encoder dial inside the armrest.

2. 2

   Inspect the internal armrest wiring for pinched, broken, or shorted wires that could cause a loss of communication or voltage irregularities.

3. 3

   Attempt to navigate the AFS Pro 1200 display using the encoder dial to see if the input is completely dead or intermittent.

1. 1

   Disconnect battery

   Disconnect the tractor's battery power before servicing the armrest electronic controls to prevent short circuits.

2. 2

   Remove covers

   Remove the armrest tray and instrument control panel covers to access the internal Electronic Controls (EDC).

3. 3

   Locate assembly

   Locate the EDC Mouse (encoder dial) assembly inside the armrest housing.

4. 4

   Disconnect harness

   Disconnect the wiring harness connected to the encoder wheel.

5. 5

   Remove screws

   Remove the retaining screws holding the encoder assembly in place (OEM diagrams note these are typically M3.5 x 12mm screws).

6. 6

   Install new dial

   Install the new encoder dial (EDC Mouse) and secure it with the retaining screws.

7. 7

   Reassemble

   Reconnect the wiring harness and reassemble the armrest panels and tray.

8. 8

   Test functionality

   Power on the tractor and test the encoder dial's functionality on the AFS Pro 1200 display.