Case IH 2748 (51872912) - UCM or DEC – UCM or DEC: Anti-Jack Knife logic error

A logic error in the Anti-Jack Knife system, typically meaning the control module is receiving conflicting data from the inputs that govern this feature (e.g., the multicontroller button, brake pedal sensors, or transmission speed sensors).

• VESTRUM CVX
• Puma CVXDrive (140-240)
• Vestrum CVXDrive (Vestrum 100)
• Luxxum
• Maxxum CVXDrive (110, 120, 130)

1. 1

   Check the operation of the service brake sensors/switches, as engaging the brakes is a primary trigger for freezing the transmission ratio.

2. 2

   Test the shuttle FWD button on the multicontroller to ensure it is not sticking or sending an erratic signal.

3. 3

   Verify that the A-Post Instrumentation Cluster properly displays the Anti-Jack Knife activation icon (Icon #18 on the Pro Vision Operating System) to see if the system thinks it is engaged.