Intake Air Temperature (IAT) Sensor

The IAT sensor measures temperature of intake air, and sends a signal to ECM. The IAT sensor is a variable-resistor type airflow sensor. As intake air temperature decreases IAT sensor output voltage to ECM increases. On Accent 1.6L and Elantra 2.0L, the IAT is combined with the manifold absolute pressure (MAP) sensor and is located in the air intake plenum. On Santa Fe 2.7L and Sonata 2.5L, the IAT sensor is located in air intake plenum. On Tiburon, the IAT sensor is located in the air cleaner housing. On all other models, the IAT is combined with the mass air flow (MAF) sensor and is located in the air intake hose. The ECM uses the IAT sensor signal to control fuel delivery. When air temperature is cold, the ECM enriches fuel mixture by increasing injector pulse width. The ECM will decrease injector pulse width when air temperature is warm.