P1097
P1097Diagnosis information - DME V8 DFI
Mass air flow ahead of throttle (MAF1) implausible
NOTE: For this fault code, the intake system between the hot-film mass air flow sensor and the throttle is monitored.
NOTE: A mass air flow is calculated from the signals from the throttle potentiometer, engine speed sensor, intake air temperature sensor and ambient pressure sensor and compared with that measured via MAF1 sensor.
Diagnostic conditions
- Vehicle voltage > 9 V
- Engine running
- No electrical MAF1 sensor fault
- No throttle valve adjusting unit fault
- No ambient pressure sensor fault
- No intake air temperature sensor fault
- No speed sensor fault
Possible fault causes
- Hot-film mass air flow sensor faulty (displaced characteristic)
(setpoint voltage with stopped engine and ignition on = 0.9 ... 1.1 V
- see Actual values, Filter [MAF], [Mass air flow 1 (sensor)])
- Air flow onto hot-film mass air flow sensor deflected