Mass Air Flow Sensor

The Mass Air Flow (MAF) sensor measures the amount of air that is ingested by the engine. The direct measurement of air entering the engine is more accurate than calculating the airflow from other sensor inputs. The sensor employs a hot film to measure the air flow rate. The MAF output voltage is a function of the power required to keep the sensing elements at a fixed temperature above ambient temperature as incoming air cools the sensing elements. As air flow increases, the current through the element increases.