P0028

P0028

Valve Lift Control Driver, Below Limit Value

Diagnostic conditions
- Battery positive voltage 10 V ... 16 V
- Time after engine starts > 10 seconds

Possible fault causes
- Solenoid hydraulic valve faulty (short circuit to housing)
- Short circuit to ground in control line to solenoid hydraulic valve
- DME control module faulty

Valve lift control driver, above limit value

Diagnostic conditions
- Short test run with 1 full-load acceleration (solenoid hydraulic valve activation)

Possible fault causes
- Solenoid hydraulic valve faulty (short circuit of coil)
- Short circuit to B+ in control line to solenoid hydraulic valve
- control module faulty

Valve lift control driver, open circuit

Diagnostic conditions
- Battery positive voltage 10 V ... 16 V
- Time after engine starts > 10 seconds

Possible fault causes
- Solenoid hydraulic valve faulty (open circuit)
- Open circuit in the activation line to the solenoid hydraulic valve
- Open circuit in the power supply line to the solenoid hydraulic valve
- DME control module faulty