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

Intake Air Temperature Sensor:

PURPOSE
The Intake Air Temperature (IAT) sensor is a thermistor used by the ECM/PCM to adjust fuel delivery and spark timing according to incoming air density.

OPERATION
The ECM/PCM supplies a 5.0 volt signal to the IAT sensor through a resistor and measures the voltage. By measuring the voltage, the ECM/PCM can determine IAT. Low intake air temperature produces a high resistance, while high intake air temperature produces a low resistance.

LOCATION
Intake Manifold