Waveforms

Air flow sensor

Used to determine the amount of air drawn into the engine cylinders. The output signal can be a linearly changing voltage or a changing frequency, depending on type and manufacturer.

Types:

  • Volume air flow sensor;
  • Hot element mass air flow sensor;
  • Hot wire mass air flow sensor;
  • Hot film mass air flow sensor;
  • Karman vortex air flow sensor.
Output voltage waveform from a properly functioning volume air flow sensor based on the  potentiometer (BMW 318 1.8i 1996). The waveform was recorded during snap throttle.
Output voltage waveform from a properly functioning volume air flow sensor based on the  potentiometer (BMW 318 1.8i 1996). The waveform was recorded during snap throttle.

Output voltage waveform from a properly functioning volume air flow sensor based on the potentiometer (BMW 318 1.8i 1996). The waveform was recorded during snap throttle.

Output voltage waveform from a properly functioning mass air flow sensor. (Toyota Avensis 1.8i 2007).
Output voltage waveform from a properly functioning mass air flow sensor. (Toyota Avensis 1.8i 2007).

Output voltage waveform from a properly functioning mass air flow sensor. (Toyota Avensis 1.8i 2007).

Output voltage waveform from a properly functioning air flow sensor BOSCH HFM5 (Alfa 156 2.0i 2001). Snap throttle.

Output voltage waveform from a properly functioning air flow sensor BOSCH HFM5 (Alfa 156 2.0i 2001). Snap throttle.

Moment of snap throttle.

Moment of snap throttle.

Output voltage waveform from a properly functioning air flow sensor BOSCH HFM5. Moment of turning the ignition on.

Output voltage waveform from a properly functioning air flow sensor BOSCH HFM5. Moment of turning the ignition on.

Output voltage waveform from a properly functioning mass air flow sensor with a frequency output (Opel Vectra C 2.2i 2006). KOEO (Key On Engine Off).

Output voltage waveform from a properly functioning mass air flow sensor with a frequency output (Opel Vectra C 2.2i 2006). KOEO (Key On Engine Off).

The engine is at idle.

The engine is at idle.