P1553

P1553

Function Monitoring Of Control Unit Fault Group B - Signal Implausible

Diagnostic conditions
- Engine speed greater than 1120 rpm

Possible fault cause
- Fault ,,P0102" or ,,P0103" is set
- Hot-film mass air flow sensor 1 and / or 2 faulty (setpoint voltage with stopped engine and ignition on = 0.9 to 1.1 V)=> see Actual values, Filter [ DME mass air flow ], [ Mass air flow 1 (sensor) ] + [ Mass air flow 2 (sensor) ]
- DME control unit faulty

Diagnosis/fault finding