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

Fig.31 Intake Manifold Air Temperature (IAT) Sensor Location:

The intake manifold air temperature sensor is installed into the rear of the intake manifold with the sensor element extending into the air stream.

The IAT provides an input voltage to the Engine Control Module (ECM) indicating intake manifold air temperature. The input is used along with inputs from other sensors for intake air heater element operation, for engine protection, fuel timing and fuel control. As the temperature of the air-fuel stream in the manifold varies, the sensor resistance changes. This results in a different input voltage to the ECM.