Mass Airflow (MAF) Sensor

MAF sensor measures intake airflow volume. Engine Control Module (ECM) accomplishes this by applying a reference voltage to a hot wire in MAF sensor. As intake air flows across hot wire, resistance value changes, causing reference voltage to change. ECM uses voltage signal to control fuel injection duration and ignition timing. MAF sensor also contains an intake air temperature sensor which is used to measure intake air temperature. See INTAKE AIR TEMPERATURE SENSOR .