Mass Airflow Sensor

Mass airflow sensor is located in main air intake duct. The sensor uses a hot-wire type sensing element. Incoming air passing through the airflow sensor causes the hot wire to cool. As a result, ECM must apply additional current to maintain hot wire at the precalibrated temperature. The ECM measures airflow by monitoring the amount of additional current required to maintain hot wire at the precalibrated temperature. If an abnormal signal from MAF sensor is received, ECM will operate in fail-safe mode.