A.F.M (vane or flap air flow sensor) I tested a faulty 1. no results.
An air flow meter operates similar to an TPS. It has a potentiometer inside it and the swivel arm that attachs to the signal is hooked up to the flap piece that opens and closes. As the flap moves it moves the arm up and down the potentiometer (variable resistor) changing the output voltage depending on where it is on the potentiometer. The signal is sent to the ECU and tell it how much air flow is in the intake manifold.
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