Ninety-Eight V6-3800 3.8L Supercharged (1993)
Intake Air Temperature Sensor: Description and Operation
Intake Air Temperature Sensor
The Intake Air Temperature sensor (IAT), mounted on the air cleaner, is a thermistor with a negative temperature coefficient. This means as temperature
increases, resistance decreases. Low intake air temperature produces a high resistance, while high intake air temperature produces a low resistance. The
ECM/PCM provides a 5 volt reference to the sensor and measures the voltage drop in the circuit. Each voltage value corresponds to a discrete resistance
of the sensor. From this information, the control module calculates the temperature of the intake air.
