Intake Air Temperature (IAT) Sensor

IAT sensor is installed in the intake manifold. The IAT sensor is a 2-wire Negative Thermal Coefficient (NTC) sensor. As intake air temperature increases, voltage decreases. As intake air temperature decreases, voltage increases. The IAT sensor provides an input to the PCM indicating intake air density based on temperature. The IAT sensor input is used by the PCM to calculate fuel injector pulse width and ignition timing spark advance. The resistance values are the same as the Engine Coolant Temperature (ECT) sensor.