Diesel diagnostics
Gasoline diagnostics
Car sensors
Complex Engine Diagnostics
CSS script documentation
Px script documentation
ElPower script documentation
Pressure Pulse diagnostics
Air Flow Sensor
The Mass Air Flow (or MAF) sensor measures the amount of air consumed by the engine. The term "mass" refers to the fact that this sensor measures the weight (or mass) of air. Earlier sensors such as the Bosch Vane Air Flow (or VAF) meter measured the volume of air. Because the density of the air varies with temperature and altitude, the Power train Control Module (PCM) had to perform additional calculations to determine the actual amount of air consumed by the engine. The signal from the MAF sensor is a major input for determining fuel delivery and, to some degree, ignition timing.
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 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
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 mass air flow sensor with a frequency output (Opel Vectra C 2.2i 2006). KOEO (Key On Engine Off)
