The Intake Air Temperature (IAT) Sensor
OPERATION & TESTING Details are as follows:----
The Intake Air Temperature (IAT) sensor resistance changes in response to the ambient air temperature. The sensor resistance decreases as the air temperature increases. This provides a signal to the PCM indicating the temperature of the incoming air charge.
The 3.0L engine sensor is mounted in the air cleaner-to-throttle body supply tube, while the 3.8L engine sensor is mounted in the air cleaner box.