Diagnosis instructions
The VDM control unit only its own faults in its own fault memory. Faults in the damper satellites are stored in their own fault memory. This is why not only the fault memory of the VDM control unit, but also that of the damper satellites, must be read out in the event of a fault.
After replacement of the ICM control unit as well as of a height-level sensor, the adjustment values of the height-level sensors must be relearned. The service function "ride height adjustment" on the diagnosis system must be used.
Initial operation
The startup routine allows the system to "learn" the parameters and the "zero points" (home positions) of all sensors. Commissioning is divided into 5 phases and it takes around 25 seconds.
- Check of direction valve
- Low pressure test
- Front axle high pressure test
- Rear axle high pressure test
- Check pressure control valve
The oil temperature is an important parameter for the commissioning. The start-up procedure (by means of service function) must not be carried out at extreme temperatures (ambient and system temperatures).