P2192

P2192

Lambda Control Adaptation In Upper Load Range, Bank 1 (FRA01) - Below Limit Value

Diagnostic conditions - V8
- Battery voltage between 10 V and 16 V
- Lambda control active
- Engine temperature greater than 60 °C
- Mass air flow greater than 320 Kg/h
- Engine load for naturally aspirated engine greater than 26.3%
- Engine load for turbo engine greater than 82.5%

Diagnostic conditions - V6
- Battery voltage between 10 V and 16 V
- Lambda control active
- Engine temperature greater than 60 °C
- Mass air flow greater than 240 Kg/h
- Engine load greater than 24%

Possible fault cause
- 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) ]
- Fuel pressure too high
- Mechanical fault in fuel injector(s)

Affected pins
DME control unit plug A, pin 29, and pin 5 of hot-film mass air flow sensor 1
Not V6 - DME control unit plug B, pin 109, and pin 5 of hot-film mass air flow sensor 2

Diagnosis/fault finding
- Diagnosis should indicate a negative deviation (leaning) of more than 30% of the lambda control adaptation in the lower load range (FRAU less than 0.7).
- V8 only - If this fault is set, both hot-film mass air flow sensors must always be tested because the main filling signal is calculated from both signals.