Mass Air Flow Sensor

Mass Air Flow Sensor:

The Mass Airflow (MAF) sensor is located between the air box and throttle body as part of the air induction system. The MAF sensor measures the amount of air that is ingested by the engine. A direct measurement of air entering the engine is more accurate than calculating airflow from the use of a Manifold Absolute Pressure (MAP) sensor. The sensor employs a hot film to measure the airflow rate. The MAF output voltage is a function of the power to keep the sensing elements at a fixed temperature above ambient temperature as incoming air cools the sensing element. As air flow increases, the current through the element increases and the sensor signal voltage will increase as well.