Ignition voltage and ground circuits are also supplied to the multifunction intake air sensor internal circuits for the Intake Air Temperature (IAT) sensor 2, Humidity sensor, and MAF sensor. The signal varies with engine load and is displayed by the scan tool as Hertz (Hz) and grams per second (g/s). The sensor uses voltage to produce a variable frequency signal based on the inlet air flow through the sensor bore. The ECM applies 5 V to the MAF sensor on the MAF sensor signal circuit. A large quantity of air entering the engine indicates an acceleration or high load condition. A small quantity of air entering the engine indicates a deceleration or idle condition. The Engine Control Module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine speeds and loads.
The MAF sensor is an air flow meter that measures the amount of air in the sensor bore. The Mass Air Flow (MAF) sensor is integrated with the multifunction intake air sensor.
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