P1094

P1094

Implausible Mass Air Flow Ahead Of Throttle Valve

Diagnostic conditions
- Battery voltage between 10 V and 16 V
- Engine running

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) ]
- Throttle valve stiff or [ blocked ]
- Secondary air between hot-film mass air flow sensor and throttle valve (e.g. crack in hose)
- Throttle valve adjusting unit faulty
- Intake air temperature sensor faulty (in hot-film mass air flow sensor)
- DME faulty (pressure sensor for ambient air pressure)

Diagnosis/fault finding
- For this fault code, the intake system between the hot-film mass air flow sensor and the throttle valve is monitored.
- The pressure sensor for ambient air pressure is installed in the engine control unit.
- Adaptation [ RKAT ] is additive, remains unadapted at ± 0.0%.
- Adaptation [ FRAU ] is multiplicative, remains unadapted at + 1.00

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