Circuit Description
WARNING: This page is about a different car, the 2006 Suzuki Verona. However, it is still accessible from the selected car via links, so may be relevant.
The Intake Air Temperature (IAT) Sensor uses a thermistor to control the signal voltage to the Engine Control Module (ECM). The ECM supplies a 5 volt reference voltage and a ground to the sensor. When the air is cold, the resistance is high; therefore IAT sensor signal voltage will be high. If the intake air is warm, resistance is low; therefore the IAT sensor signal voltage will be low.