Adjustments for air temperature and humidity are taken into consideration, since they also affect the temperature of the heated wire or film. The current flow is changed to a frequency, which is sent to the Powertrain Control Module ( PCM) and interpreted as air flow. The drop in resistance allows moreĬurrent to flow through it in order to maintain the programmed temperature. The heated wire or film is a Positive Temperature Coefficient (PTC) resistor, which means that the resistance of it drops when the temperature drops. This wire is positioned in the air stream and is heated by the electrical current that the voltage produces. A constant voltage is applied to a heated wire. The Mass Air Flow (MAF) Sensor is a frequency based device. P0101 - Mass Air Flow Sensor "A" Circuit Performance
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