Tracker 4WD V6-2.5L VIN 4 (2001)
Mass Air Flow (MAF) Sensor: Description and Operation
MASS AIR FLOW (MAF) SENSOR
The Mass Air Flow (MAF) sensor is of the thermal control type. The MAF sensor consists of a heat resistor element located inside the bore of the
throttle body, an air straightening screen (2), and a control circuit board (1). The heat resistor is cooled off by the air entering the MAF sensor. The
control circuit maintains the heat resistor temperature within a predetermined range. When the amount of air entering the sensor increases, the signal
created by the sensor and sent to the Powertrain Control Module (PCM), also increases. When the air flow decreases, so does the signal current to the
PCM. The MAF sensor is an integral part of the throttle body.
The Mass Air Flow (MAF) sensor measures the amount of air which passes over the heat resistor in a given amount of time. The PCM uses this
information in order to determine the operating requirements of the engine and control fuel delivery. A large quantity of air movement indicates
acceleration, while a small quantity indicates deceleration or idle.
