DeVille V8-4.6L VIN 9 (1995)
Intake Air Temperature Sensor: Description and Operation
Voltage Versus Temperature Chart
DESCRIPTION
The Intake Air Temperature (IAT) sensor is a thermistor (a resistor that changes value with temperature) mounted on the air cleaner duct and it
measures changes in the temperature of air entering the engine. High air temperatures result in low resistance and low air temperatures result in high
resistance. The Powertrain Control Module (PCM) provides a 5 volt reference signal and a ground to the IAT sensor. The PCM measures the voltage
changes in the signal due to the sensors resistance. A high air temperature will result in low signal voltage (near 0 volt) to the PCM and low air
temperature will result in high signal voltage (near 5 volts).
