Air Temperature Sensor ( Ambient / Intake ): Description and Operation
INTAKE AIR TEMPERATURE (IAT) SENSORThe intake air temperature (IAT) sensor is a thermistor device. The electrical resistance of a thermistor decreases as the temperature increases, and resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor providing a signal corresponding to temperature.
The 6.0L diesel utilizes two IAT sensors. The IAT sensor is integrated into the mass air flow (MAF) sensor. The PCM uses the AT signal to control timing and fuel rate during cold starts and provide an input to the cold idle kicker.
INTAKE AIR TEMPERATURE 2 (IAT2) SENSOR
Intake Air Temperature 2 (IAT2) Sensor:
The IAT2 or manifold air temperature (MAT) sensor is a thermistor device. The electrical resistance of a thermistor decreases as the temperature increases, and resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor providing a signal corresponding to temperature.
The IAT2 sensor is located in the intake manifold. The sensor provides a manifold air temperature signal to the PCM.