Case IH 520213-02 - VCM – UCM / VCM: Steering valve controller internal fault

Severe internal hardware or software failure within the steering valve's dedicated controller. Often triggered by SPI communication connection loss, an SPI message queue overflow, or a RAM-code test failure.

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

1. 1

   Bleed the Steering System: Turn the steering wheel fully left and fully right a minimum of 10 times to bleed all air from the steering system.

2. 2

   Check for Software Updates: Verify if the Steering Valve Controller (SVC) software needs to be flashed/updated to version 2.02 (Software Part Number: 51631896) using the CNH Electronic Service Tool (EST).

3. 3

   Verify Wiring and Voltage: Check the harness connecting the UCM to the steering valve. Ensure there are no shorts to ground or power, voltage mismatches, or overvoltage on the steering valve controller circuit.

1. 1

   Depressurize the System

   Turn off the tractor and relieve all hydraulic pressure before servicing the steering valve.

2. 2

   Disconnect the Battery

   Manually trip the circuit breaker or disconnect the battery to prevent electrical shorts during module replacement.

3. 3

   Replace the UCM / Steering Valve Controller

   Locate the UCM/VCM (usually in the cab or under the right-hand console). Disconnect the multi-pin OEM connectors and remove the module. If the fault is isolated to the Danfoss PVED-CLS valve controller mounted on the steering valve itself, unbolt the controller from the hydraulic valve body.

4. 4

   Reinstall and Reconnect

   Install the new module and securely click the CAN-bus connectors into place.

5. 5

   EST Configuration

   Connect the CNH Electronic Service Tool (EST). The new UCM/VCM must be configured to the tractor's specific equipment profile (e.g., transmission type, grid heater presence, steering ratios) so the tractor recognizes the new module.

6. 6

   Calibration

   Perform an on-road steering calibration on an unpainted concrete or asphalt surface. Ensure the steering valve is supplied by sufficient oil flow during the calibration routine.