P0204

P020400

Diagnosis information DME control unit

Injection valve Cylinder 4

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.

Diagnostic conditions
- Engine running

Possible fault causes
- Loose contact or corrosion on connectors or lines
- Short circuit to B+/ground/between lines or open circuit in the lines (Activation)
- Injection valve Faulty

NOTE:
Diagnosis/Fault finding.
- Check injector resistance
- Check injector wiring