Tiburon L4-2.0L (1999)
Air Flow Meter/Sensor: Description and Operation
MASS AIR FLOW (MAF) SENSOR
This hot film type air flow sensor is composed of a hot film sensor, housing, metering duct (hybrid, sensor element).
Mass air flow rate is measure by detection of heat transfer from a hot film probe because the change of the mass air flow rate causes change in the
amount of heat being transferred from the hot film probe surface to the air flow. The air flow sensor generates a pulse so it repeatedly opens and closes
between the 5.0 V voltage supplied from the engine control module. this results in the change of the temperature of the hot film probe and in the change
of resistance
The Mass Air Flow (MAF) Sensor is located in the air cleaner. The sensor measures the mass of air passing though the air intake and generates a pulsed
signal. The Engine Control Module (ECM) counts the pulses generated by the sensor and uses the signal to set fuel injector base pulse width and ignition
timing.
To operate, the MAF sensor requires battery voltage at sensor terminal 3 and ground at sensor terminals 1 and 2. As air passes through the sensor, the
sensor generates pulses at sensor terminal 4. The frequency of the pulses increases as mass air flow increases.
