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, PCM must apply additional current to maintain hot wire at the precalibrated temperature. The PCM measures airflow by monitoring the amount of additional current required to maintain hot wire at the precalibrated temperature. If MAF sensor output current is outside normal operational range, PCM will use throttle position sensor as primary information on driving condition.