Impreza RS Coupe AWD F4-2.5L SOHC (1999)
Air Flow Meter/Sensor: Description and Operation
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The MFI system employs a hot-film type mass air flow sensor.
This mass air flow sensor converts the amount of air taken into the engine into an electric signal by utilizing the heat transfer phenomenon between
the incoming air and a heating resistor (hot film) located in the air intake.
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The features of this flow sensor type are as follows:
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High-altitude compensation is made automatically.
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Quick response
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These are no moving parts.
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They are compact.
