Case IH 2461 - UCM – UCM: Shuttle lever R1 switch voltage too low.

The control module is detecting that the voltage signal from the R1 (Reverse 1) switch inside the Forward/Neutral/Reverse (FNR) shuttle lever assembly has dropped below the acceptable threshold.

• VESTRUM CVX
• Maxxum Series 110
• Maxxum Series 115
• Maxxum Series 120
• Maxxum Series 125
• Maxxum Series 130
• Maxxum Series 140
• Magnum Series 180-340
• Steiger Series 350-600
• JX Series
• JXC Series JXC75-JXC110
• JXU Series JX70U-JX1100U
• Puma Series
• Optum Series

1. 1

   Cycle the Lever: Rapidly cycle the shuttle lever from forward to reverse and back to neutral several times to free up potentially sticking internal switches.

2. 2

   Harness Inspection: Remove the steering column cowling and inspect the wiring harness exiting the shuttle lever for chafed wires or pinched harnesses.

3. 3

   Voltage Test: Disconnect the shuttle lever multi-pin connector. Using a multimeter, verify that the UCM is supplying the correct reference voltage (typically 5V) and a good ground. Test the R1 signal wire for continuity to the UCM and ensure it is not shorted to ground.

4. 4

   On-Board Diagnostics (H-Menu): Enter the diagnostic H-Menu (e.g., H7 mode for cab inputs) and monitor live switch states to see if the UCM registers the switch changing from open to closed when moved into reverse.

1. 1

   Disconnect Power

   Turn off the ignition and disconnect the negative battery cable to prevent electrical spikes to the UCM.

2. 2

   Remove Cowling

   Remove the plastic covers/cowling surrounding the steering column to expose the base of the shuttle lever.

3. 3

   Disconnect Wiring

   Unplug the multi-pin electrical connector from the base of the shuttle lever.

4. 4

   Remove the Lever

   Remove the mounting screws or bolts securing the shuttle lever bracket to the steering column assembly and slide the old unit out.

5. 5

   Install New Lever

   Position the new shuttle lever assembly into place and secure it with the mounting hardware.

6. 6

   Reconnect

   Plug the electrical harness back in, ensuring the locking tab clicks into place.

7. 7

   Reassemble & Test

   Reinstall the steering column cowling. Reconnect the battery, turn the key ON, and clear the stored fault codes. Test the tractor's forward and reverse engagement to verify the repair.