MASS AIR FLOW (MAF) SENSOR CONSTRUCTION/OPERATION [MZI-3.7]

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• Incorporates the IAT sensor.

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• The MAF sensor uses a hot wire sensing element to measure the amount of air entering the engine.
• Air passing over the hot wire causes it to cool.
• This hot wire is maintained at 200 °C {392 °F} above the ambient temperature as measured by a constant cold wire.
• The current required to maintain the temperature of the hot wire is proportional to the mass air flow.
• The MAF sensor then outputs an analog voltage signal to the PCM proportional to the intake air mass.

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