Diagnostic Aids

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

The IAT Sensor 1 and IAT Sensor 2 are integrated with the multifunction intake air sensor. With RPO LF3 or LF4, the 8-pin sensor is in the intake air duct nearest to the front of the vehicle.
With the ignition ON, the engine OFF, if the engine is cold, a properly functioning IAT sensor 1 will gradually increase the scan tool IAT Sensor 1 parameter. This is due to the heat that is generated by the MAF sensor heating elements.