P1097 Diagnosis Information - DME (DFI)

P1097

Diagnosis Information - DME (DFI)

Implausible mass air flow ahead of throttle valve

NOTE:
- This fault code is used for monitoring the intake system between the hot film mass air flow (MAF) sensor and the throttle valve.
- A mass air flow is calculated from the signals from the throttle potentiometer, engine speed sensor, intake air temperature sensor and ambient pressure sensor as well as other engine operating values.
- The calculated mass air flow is compared with that measured by the mass air flow (MAF) sensors.

Diagnostic conditions
- Throttle valve was adapted under the right conditions
(including: intake air temperature < 40 °C (104 °F))
- Engine running
- No electrical fault for hot-film mass air flow sensor (MAF)
- No throttle valve adjusting unit fault
- No ambient pressure sensor fault
- No intake air temperature sensor fault
- No speed sensor fault
- No valve lift fault
- No camshaft adjustment fault
- No intake manifold switch-over fault

Possible fault causes
- Air flow onto hot-film mass air flow (MAF) sensor deflected
- Hot-film mass air flow (MAF) sensor faulty (displaced characteristic)