Air Temperature Sensor ( Ambient / Intake ): Description and Operation

IAT Sensor And MAP Sensor:

INTAKE AIR TEMPERATURE SENSOR - PCM INPUT
The IAT sensor and Manifold Absolute Pressure (MAP) sensor are a combined sensor that attaches to the intake manifold for this engine.

The Intake Air Temperature (IAT) sensor measures the temperature of the intake air as it enters the engine. The sensor supplies one of the inputs the PCM uses to determine injector pulse width and spark advance.