P2177

P2177

Diagnosis information - DME V6 DFI

Lambda control adaptation FRAU, bank 1 - lower load range

NOTE: Diagnosis should indicate a positive deviation (enrichment) of more than 30% of the lambda control adaptation in the lower load range (FRAU > 1.3).

Diagnostic conditions
- Battery positive voltage between 10 V and 16 V
- Lambda control active
- Engine temperature > 60 °C (140 °F)
- Engine load between 6 % and 30 %
- Mass air flow between 6 kg/h and 32 kg/h
- Engine speed between 320 rpm and 880 rpm

Possible fault causes
- Incorrect main filling signal from hot-film mass air flow sensor (setpoint voltage with stopped engine and ignition on = 0.9 ... 1.1 V)
- Intake system leak
- Leak in exhaust system (drawing in fresh air)
- Fuel pressure too low
- Mechanical fault of fuel injector(s) (stuck)
- Fuel pump delivery too low

Affected contacts on the DFI control unit connector
Connector [B]:
- Contact 85
- Contact 64

Affected contacts on the hot-film mass air flow sensor 1 connector
- Contact 5
- Contact 3