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• P1097

  P1097

  
  

  Diagnosis information - DME V6 DFI

  
  

  Mass air flow ahead of throttle valve (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

• Battery positive voltage between 10 V and 16 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 1 faulty (displaced characteristic) (setpoint voltage with stopped engine and ignition on = 0.9 ... 1.1 V)
• Clogged air cleaners
• Leakage between MAF1 sensor and throttle valve adjusting unit