P308E

P308E00

Diagnosis information DME control unit

Fuel-pump control

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.

Diagnostic conditions
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.
- Ignition on

Possible fault causes
- mechanically sluggish
- Short circuit
- Faulty

Fault setting condition(s)
- Open circuit Phase timing

NOTE:
Diagnosis/Fault finding.
- Check of function using drive link test
- Short circuit to B+/mutual short circuit or open circuit in the lines
- Plug disconnect and Fault memory delete