Case IH 519574-13 - UCM – UCM: Steering valve controller calibration fault

The steering valve controller has either failed its calibration process, lost its calibration data, or is operating out of its calibrated range.

• MAGNUM AFS Connect
• Magnum 180
• Magnum 200
• Magnum 220
• Magnum 240
• Magnum 250
• Magnum 280
• Magnum 310
• Magnum 340
• Magnum 380
• Magnum 400

1. 1

   Check for other active codes related to the UCM, wheel angle sensor, or steering valve supply voltage (e.g., 627-04 for low voltage to the steering valve). Address voltage or sensor circuit faults first.

2. 2

   Inspect the wiring harness and connectors at the steering hydraulic valve and the LVDT (Linear Variable Differential Transformer) sensor for damage, corrosion, or loose pins.

3. 3

   Ensure the external guidance system (if equipped) is properly initialized and communicating via the ISObus.

1. 1

   Prepare the tractor

   Start the tractor and ensure it is stationary on a flat surface. Turn on the external guidance system and initialize the controller.

2. 2

   Access the calibration menu

   Go to the ISObus diagnostic page or the steering settings page on the Pro 1200 display.

3. 3

   Run the calibration wizard

   Select the "Steering Valve Calibration" option. Follow the on-screen wizard built into the display to perform the calibration.

4. 4

   Verify success

   If the calibration is successful, the steering settings page should display the correct steering mode (e.g., "GPS – ISO") and the fault code should clear.

5. 5

   Address repeated failures

   If the calibration fails repeatedly (usually after 2 to 4 attempts), inspect the steering hydraulic valve for incorrect assembly or internal failure.

6. 6

   Software/Hardware replacement

   If the valve and sensors test good, the Steering Valve Controller (SVC) may require a software re-flash or physical replacement.