The mass air flow (MAF) sensor is an air flow meter that measures the amount of air entering the
engine. The powertrain control module (PCM) uses the MAF sensor signal in order to provide
the correct fuel delivery for a wide range of engine speeds and loads. A small quantity of air
entering the engine indicates deceleration or idle. A large quantity of air entering the engine
indicates an acceleration or high load condition.

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Mass Airflow Sensor Operation