Pathfinder 4WD V6-3.3L (VG33E) (1996)
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Mass Air Flow Sensor: Description and Operation
Mass Air Flow Sensor
DESCRIPTION
The mass air flow sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It
consists of a hot wire that is supplied with electric current from the ECM. The temperature of the hot wire is controlled by the ECM a certain
amount. The heat generated by the hot wire ~ is reduced as the intake air flows around it. The more air, the greater the heat loss.
Therefore, the ECM must supply more electric current to maintain the temperature of the hot wire as air flow increases. The ECM detects the air
flow by means of this current change.
