Intake Air Temperature Sensor

The Intake Air Temperature (IAT) sensor measures temperature of intake air, and sends a signal to the 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, Elantra and Tiburon 2.0L, the IAT sensor is combined with the Manifold Absolute Pressure (MAP) sensor and is located in the air intake plenum. On Santa Fe 2.4L and 3.5L, Sonata 2.4L and XG350, the IAT sensor is combined with the Mass Air Flow (MAF) sensor and is located in the air intake hose. On Santa Fe 2.7L, Sonata 2.7L and Tiburon 2.7L, the IAT sensor is located in air intake plenum. 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 as air temperature warms.