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

PURPOSE
The Intake Air Temperature (IAT) Sensor, mounted on the intake manifold facing the firewall on the driver's side, provides a signal used by the Programmed Fuel Injection Electronic Control Module (PGM-FI ECM) to determine intake air temperature for mixture control.

OPERATION
The resistance of the thermistor decreases as the air intake temperature increases. The PGM-FI ECM uses this decreasing resistance to adjust the length of injector opening time.