- A vane air flow (VAF) sensor.
- Typical air vane sensor with the cover removed.
The movable arm contacts a carbon resistance path as the vane opens.
Many air vane sensors also have contacts that close to supply voltage to the electric fuel pump as the air vane starts to open when the engine is being cranked and the air is being drawn into the engine.
This five-wire mass air flow sensor consists of a metal foil sensing unit, an intake air temperature (IAT) sensor, and an electronic module.
The sensing wire in a typical hot wire mass air flow sensor
Figure:5
A Karman Vortex air flow sensor uses a triangle-shaped rod to create vortexes as the air flows through the sensor.
Figure: 6
The electronics in the sensor itself convert these vortexes to a digital square wave signal.
Carefully check the hose between the MAF sensor and the throttle plate for cracks or splits that could create extra (false) air in the engine that is not measured by the MAF sensor.
Airflow sensor with the protective cover removed.
Broken airflow vane return spring
READ: VEHICLE SENSORS: FUNCTIONS AND TYPES
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