Case IH 520219-25 - VCM – VCM: Steering valve controller steering control disagreement

The steering valve controller is detecting a mismatch between the commanded steering angle and the actual physical feedback provided by the wheel angle sensor (WAS), or there is a communication/configuration failure between the steering valve and the sensor.

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

1. 1

   Power off the vehicle before working around the steering axle to prevent sudden movement and severe injury

2. 2

   Locate and inspect the Wheel Angle Sensor (WAS) and its harness connection (often on the left side of the tractor)

3. 3

   Verify the correct WAS adapter cable is installed for the specific axle configuration

4. 4

   Access the cab display (e.g., Pro 700 or AFS Connect monitor) and check for coarse WAS readings during the steering calibration process

5. 5

   Check the software versions on the Steering Valve Controller (SVC) and the Advanced Steering Configuration controller dataset to ensure they are up to date and not corrupted

1. 1

   Secure the Machine

   Turn off the tractor and ensure the steering axle is physically secured.

2. 2

   Physical Inspection

   Inspect the wheel angle sensor, the mechanical linkage rod lengths, and the wiring harness for physical damage, corrosion, or loose connections.

3. 3

   Harness/Cable Correction

   If the WAS adapter cable is incorrect, damaged, or failing to provide a consistent signal, replace or modify the cable as per the specific steering-ready installation manual.

4. 4

   Sensor Replacement

   If the wiring is intact but the sensor fails to read correctly during a multimeter sweep or display check, replace the Wheel Angle Sensor.

5. 5

   System Calibration

   After replacing any physical parts or adjusting rod lengths, perform a full steering calibration using the tractor's display to synchronize the steering valve controller with the new wheel angle sensor parameters.

6. 6

   Software Flash

   If the physical components are functioning but the disagreement code persists, the Steering Valve Controller (SVC) may require a software re-flash or replacement by a dealer.