Intake Air Temperature (IAT) Sensor

IAT sensor is located on intake manifold, with sensor element extending into the air stream. The sensor measures the temperature of air entering the intake manifold. This 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.

IAT sensor is a Negative Temperature Coefficient (NTC) thermistor-type sensor. At cold temperatures, the resistance is high. As temperature increases, its resistance decreases.