Intake Air Temperature (IAT) Sensor

IAT is thermistor whose resistance decreases as intake air temperature increases. ECM uses IAT sensor signal to control fuel delivery. When air temperature is cold, ECM enriches fuel mixture by increasing injector pulse width. ECM will decrease injector pulse width when air temperature is warm. On Optima & Magentis (Canadian) (2.5L) and Rio sensor is located in intake plenum. On Optima & Magentis (Canadian) (2.4L) sensor is a component of MAF sensor. On Sephia, Spectra and Sportage, sensor is located in air cleaner housing.