Oxygen Sensor Ahead of Catalytic Converter, Oxygen Sensor Heater

P005000

Diagnostic information - DME control unit

Oxygen sensor ahead of catalytic converter, oxygen sensor heater

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:
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Diagnostic conditions
- Engine on

Possible fault causes
- Short circuit to B+
- Short circuit to ground
- electrical fault

NOTE:
Diagnosis/Fault finding.
- Check wiring between control unit and component for open circuit
- Check component power supply
- Internal diagnostic voltage (between 3 V and 6 V)