Intake Air Sensor
The intake air sensor provides the control unit with voltage signals. The intensity of these signals, depends upon intake air volume and air temperature. The incoming air moves the stator flap against the force of the return spring.
As more air is drawn in, stator flap opens even more. This rotary motion of the stator flap actuates a potentiometer and thus varies the strength of the signal sent to the Electronic Control Unit (ECU).
Connected to the stator flap is a dampening flap which prevents rapid oscillations of the stator flap. See Fig 1. One of the contacts on the potentiometer operates the fuel pump as the stator flap is opened by air flow. This sensor is an integral part of the potentiometer and its operation modifies signal sent to the ECU.