GM 19205185 Sensor,Mass Airflow

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The Mass Airflow (MAF) sensor is located on the air filter housing and consists of a platinum hot wire, a thermistor, and a control circuit inside a plastic housing. The sensor uses a hot-wire sensing element to measure the molecular mass (weight) of air entering the engine. As the throttle opens, an increasing volume of air passes over the hot wire, which cools the wire. The MAF sensor circuit is designed to maintain the hot wire at a constant preset temperature by controlling the current flow through the hot wire. As the wire cools, the PCM increases the flow of current through the hot wire to maintain the wire at a constant temperature. The output voltage signal of the MAF sensor varies by this current flow. This voltage signal is measured by the PCM, which converts this signal into a digital waveform, calculates the fuel injector pulse width (duration), and turns the injectors on and off accordingly. A problem in the sensor circuit will set a diagnostic trouble code. Make sure the ignition key is in the OFF position. Disconnect the electrical connector from the MAF sensor. Remove the two sensor retaining screws and remove the MAF sensor and O-ring from the air filter housing. Installation is the reverse of removal. Be sure to install a new O-ring between the MAF sensor and the filter housing.