Optima L4-2.4L (2001)
Air Flow Meter/Sensor: Testing and Inspection
MASS AIR FLOW (MAF) SENSOR & INTAKE AIR TEMPERATURE (IAT) 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 measured 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 V voltage supplied from the engine control module. This results in the change of the temperature of the hat film probe and in the change of
resistance.
CIRCUIT DIAGRAM
