Mass Airflow (MAF) Sensor

MAF sensor measures flow of air entering the engine. This measurement of airflow is a reflection of engine load (throttle opening). The sensing element (hot wire) is a thin platinum wire wound on a ceramic bobbin and coated with glass. The hot wire is maintained at 392°F (200°C) above cold wire (ambient temperature) located downstream of hot wire. As air passes through the airflow sensor, the temperature of the air is measured as it passes over the cold wire sensor. The ECA uses this information to control fuel delivery.