P0100 Mass or Volume Air Flow Circuit Malfunction
The Mass Airflow Sensor (MAF) measures the temperature and volume of air flowing into the engine. The computer uses that information to calculate air density. With an air density value, the computer can then determine how much fuel to add to the air.
There are two basic MAF sensor designs — analog and digital. The digital style usually uses three wires—12volt power, ground, and a third wire to carry the digital on/off signal to the computer. The on/off signal varies in frequency, depending on the amount of airflow through the MAF. To test a digital MAF you need an automotive scope.
In the analog design, the MAF puts out a variable voltage. These sensors can have up to five wires. These sensors can be tested with a computer safe test light.
A P0100 code means the computer has detected a circuit malfunction between the power or reference wire and ground.
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© 2007 Rick Muscoplat
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