Laser FWD L4-1997cc 2.0L DOHC (1992)
Air Flow Meter/Sensor: Description and Operation
Air Flow Sensor Circuit
PURPOSE
The Air Flow Sensor (AFS) measures the amount of air entering the intake manifold to provide the ECU with precise intake volume information.
The AFS is a "Karman Vortex" type which measures the intake air volume.
LOCATION
The air flow sensor is attached to the upper air filter housing.
Volume Air Flow Sensor Operation
OPERATION
The air flow sensor operates by means of a vortex generating column and an ultrasonic sound emitter and receiver, located in the air flow chamber.
The transmitter sends sound waves across the airflow sensor chamber. The time it takes the sound to reach the receiver without any air flow is the
reference time (speed).
