Air Flow Meter/Sensor: Description and Operation

Mass Air Flow (MAF) Sensor:

The MAF sensor is an electronic device that measures air flow into the intake manifold. The MAF sensor is mounted to the throttle body. The MAF sensor is supplied battery voltage and a ground. The MAF sensor in turn sends a frequency signal to the PCM. As air flow increases, the signal frequency increases and as air flow decreases, the signal frequency decreases. A high flow signal will be close to 9000 Hertz and a low flow signal will be close to 2000 Hertz.