•  The heat resistor type MAF sensor detects the mass intake air flow that corresponds to the output current.

•  The output current is controlled by the control circuit within the MAF sensor and heats the heat resistor so that the temperature difference between the heat resistor and the intake air is constant.

•  The output current required to maintain the heat resistor temperature is proportional to the intake air flow volume. The output current characteristic against the mass intake air flow is as shown in the figure below.

•  The cole-resistor corrects the variation in resistance of the heat resistor which is caused by the intake air temperature.