Case IH 520200-19 - VCM – VCM: Loss of communication between the steering valve controller and the vehicle speed sensor

The steering controller never received the vehicle speed sensor signal (such as a boot-up timeout) or that the received network data contained an error.

• MAGNUM AFS Connect
• Magnum
• Steiger
• Puma
• Optum
• Maxxum

1. 1

   Check the controller's parameter settings (such as VSP source address, automobile rank, and gear ratio) to ensure they are correct and have not been lost

2. 2

   Inspect the physical installation state of the vehicle speed sensor, paying close attention to the sensor gap

3. 3

   Verify that the vehicle speed sensor is receiving power and ensure the PVED-CLS controller's supply voltage is stable (fluctuations below 9V can cause faults)

4. 4

   Check the CAN Bus wiring and harness connections to ensure the vehicle speed sensor is physically communicating with the network

1. 1

   Verify Parameters

   Check the parameter settings in the controller. If they are abnormal, set the parameters again.

2. 2

   Adjust Sensor Gap

   Inspect the vehicle speed sensor installation. If the installation is abnormal, adjust the sensor gap and mount it correctly.

3. 3

   Repair Wiring

   Fix any broken wires or loose CAN bus connections between the speed sensor and the VCM/PVED-CLS controller.

4. 4

   Replace Sensor

   If the wiring is intact, the parameters are correct, and the gap is adjusted but the fault persists, replace the vehicle speed sensor.

5. 5

   Bleed the Steering System

   If any hydraulic steering components were disturbed, bleed all air from the steering system by turning the steering wheel fully left and fully right a minimum of 10 times.

6. 6

   Calibrate

   Perform a steering calibration routine. This must be done on a hard, on-road surface such as unpainted concrete or asphalt.