Intake Air Temperature (IAT) Sensor

IAT sensor is located on intake manifold, with sensor element extending into air stream. IAT sensor measures temperature of air entering intake manifold. IAT sensor is a Negative Temperature Coefficient (NTC) thermistor-type sensor. At cold temperatures, resistance is high. As temperature increases, its resistance decreases. Sensor provides an analog voltage signal to PCM. This signal is used to compensate for changes in air density due to temperature. PCM uses IAT sensor inputs along with other inputs to determine injector pulse width.