Case IH 520211-12 - VCM – VCM: Steering valve controller circuit fault, over voltage

FMI 12 indicates a 'Bad intelligent device or component.' The Danfoss PVED-CLS controller 'Overvoltage supervisor Self-test failed,' which is a severe internal hardware failure within the steering controller.

• MAGNUM AFS Connect
• Magnum 400

1. 1

   Check the wiring harness between the VCM/UCM and the steering valve controller for rubbed wires that could be causing a short-to-power (high voltage source).

2. 2

   Verify that the machine's charging system is not overcharging and that the supply voltage reaching the steering valve connector is within the normal 12V operating range.

3. 3

   If the external harness and supply voltage test normal, the fault is isolated to an internal hardware failure of the steering valve controller.

1. 1

   Disconnect battery power

   Disconnect battery power to the machine to prevent electrical arcing.

2. 2

   Disconnect wiring harness

   Disconnect the wiring harness from the steering valve controller (PVED-CLS actuator).

3. 3

   Remove faulty controller

   Unbolt and remove the faulty PVED-CLS controller from the EHi electrohydraulic steering valve body.

4. 4

   Mount new controller

   Mount the new service part (PVED-CLS controller) to the steering valve.

5. 5

   Reconnect harness and power

   Reconnect the wiring harness and restore battery power.

6. 6

   Perform safety validation and calibration

   Use the PLUS+1® service tool (or the Case IH Electronic Service Tool - EST) to read out the identification data, ensure the correct firmware is loaded, and perform an auto-calibration of the steering valve so the VCM recognizes the new module.