Regal V6-191 3.1L (1991)
Intake Air Temperature Sensor: Description and Operation
Intake Air Temperature Sensor
The Intake Air Temperature sensor (IAT) is a thermistor mounted in the intake manifold. Low intake air temperature produces a high resistance, while
high intake air temperature produces a low resistance. The ECM supplies a 5.0 volt signal to the sensor through a resistor and measures the voltage. By
measuring the voltage, the ECM can determine IAT.
