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Typically Mass Air Flow (MAF) sensors work on the thermistor concept. A current flows through the themistor, heating it, which changes its resistance. The change in resistance results in a new voltage across the sensor. The way that the sensor measures mass air flow is that the mass of the air (amount of air) flowing past the sensor cools it, again changing its temperature. I have been always been amazed at how well MAF's are suited to engines. Cold wet dense air has greater mass than hot dry air, since the parameter that is needed by the engine computer is the mass of air being put into the cylinders each stroke, a MAF works to exactly provide the measurement needed.
I hope that the above description isn't too general. Specifically, there are many ways to measure the resistance of the MAF. I don't know which specific method the F-150 uses.
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∙ 15y ago
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