Five Hundred AWD V6-3.0L VIN 1 (2005)
The IAT provides air temperature information to the PCM. The PCM uses the air temperature information as a correction factor in the calculation of
fuel, spark, and air flow.
The IAT sensor provides a quicker temperature change response time than the ECT or CHT sensor.
Currently there are 2 design types of AT sensors used, a stand-alone/non-integrated type and a integrated type. Both types function the same, however
the integrated type is incorporated into the mass air flow (MAF) sensor instead of being a stand alone sensor.
Supercharged vehicles use 2 IAT sensors. Both sensors are thermistor type devices and operate as described above. However, one is located before the
supercharger at the air cleaner for standard OBD/cold weather input, while a second sensor (IAT2) is located after the supercharger in the intake
manifold. The IAT2 sensor located after the supercharger provides air temperature information to the PCM to control border-line spark and to help
determine intercooler efficiency.
