P0628
P062800Diagnosis information DME control unit
Fuel pump relay
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
- Open circuit
- Short circuit to ground
- Short circuit to B+
Fault setting condition(s)
- Open circuit Voltage Less Than 2.5 V but Greater Than 1.5 V
- Short circuit to ground Voltage < 1.5 V
- Short circuit to B+ Current > 1.5 A
NOTE:
Diagnosis/Fault finding.
- Check of function using drive link test
- Short circuit to B+/mutual short circuit or open circuit in the lines
- Relay disconnect and Fault memory delete