The IAT sensor (Intake Air Temperature) measures the temperature of the air when it detects the resistance in the air. This is generally located in the part of the intake air duct network, but depending on the vehicle it can also be in the intake manifold.
This sensor has two cables supplied by the Powertrain Control Module (PCM), one is a reference signal that is 5 volts, while the other cable is the one that provides the ground.
When the air passes through the IAT sensor (input air temperature sensor) the resistance changes. It should be mentioned that the change in resistance affects the 5 volts that are supplied to the sensor. If the air is cold, the resistance increases thus giving a higher voltage, on the other hand, the resistance drops if the air is warmer while obtaining a lower voltage. In the event that the PCM (Power Train Control Module) detects a voltage that is outside the sensor’s normal function range, the DTC code P0110 OBD2 is set.