Case IH 519116-04 - VCM – VCM: C2 transmission control lever position signal voltage low

The signal voltage from the C2 transmission control lever (integrated into the armrest's Multi-Function Handle) has dropped below the normal operating threshold. This indicates a short to ground in the signal circuit, an open circuit in the wiring harness, a loss of the 5V reference voltage, or an internal failure of the position sensor/potentiometer inside the control lever.

• MAGNUM AFS Connect
• Case IH Magnum AFS Connect series (Magnum 250, 280, 310, 340, 380, 400)
• Case IH Steiger AFS Connect series

1. 1

   Determine if the operator caused the fault by holding the transmission control lever (FNRP) out of any detent position for more than 2 seconds. If so, clear the code and train the operator on proper use.

2. 2

   Check the transmission control lever function on the instrumentation controller gear display to see if the lever's physical position matches the commanded gear on the screen.

3. 3

   Inspect the wiring harness between the Multi-Function Handle and the VCM. Look for chafed wires causing a short to ground or broken wires causing an open circuit.

4. 4

   Disconnect the Multi-Function Handle and VCM connectors to check for bent, corroded, or pushed-back pins.

5. 5

   Verify that the Multi-Function Handle is receiving the proper 5V reference voltage and has a solid ground.

1. 1

   Power down tractor

   Power down the tractor and turn the battery disconnect switch to the OFF position.

2. 2

   Remove trim panels

   Remove the trim panels on the armrest to access the mounting hardware and wiring for the Multi-Function Handle (MFH).

3. 3

   Disconnect electrical harness

   Disconnect the electrical harness connectors from the base of the handle.

4. 4

   Remove faulty handle

   Remove the retaining bolts securing the handle to the armrest console and remove the faulty handle.

5. 5

   Install new handle

   Install the new Multi-Function Handle and secure the mounting bolts.

6. 6

   Reconnect harness and reinstall panels

   Reconnect the electrical harness and reinstall the armrest trim panels.

7. 7

   Power on and navigate to calibration

   Power the tractor on and navigate to the tractor's calibration menu on the Pro700/AFS display.

8. 8

   Perform Transmission/Lever Calibration

   Perform a Transmission/Lever Calibration so the VCM can learn the new sensor voltage limits. Follow the on-screen prompts, which will require you to move the transmission control lever into specific gears (e.g., Forward, Neutral, 3rd/4th gear) while manipulating engine RPMs as instructed by the display.