P1250

P125000

Diagnostic information - DME control unit

Fuel metering valve

DANGER
High voltage.
Death or severe injuries due to high voltage or high current.

- De-energise the vehicle in accordance with the guidelines.
- Work must not be performed on parts carrying a high voltage.

The control unit must be active in order to test internal function sequences and diagnosable inputs/outputs.
In the event of a fault, check whether the fault is permanently >present<. To perform the check, erase the fault memory, meet the diagnostic conditions and read out the fault memory again.

NOTE:
- Engine failure possible
- Reduced engine power
- Engine management runs in emergency mode

Diagnostic conditions
- Ignition on
- Supply voltage > 11.5 V

Possible fault causes
- Load drop
- Short circuit to B+
- Short circuit to ground
- faulty