The Intake Air Temperature (IAT) sensor resistance changes in response to the intake air temperature. The sensor resistance decreases as the surrounding air temperature increases. This provides a signal to the PCM indicating the temperature of the incoming air charge.
Most engines mount the IAT sensor in the air cleaner-to-throttle body supply tube. However, some earlier engines have it mounted to the upper intake manifold.
| Fig. 1: Typical Intake Air Temperature (IAT) sensor
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