Intake Air Temperature (IAT) Sensor

On Esteem and Swift, IAT sensor is located on air cleaner pipe leading to throttle body. On Vitara and Grand Vitara, IAT sensor is located on side of air cleaner housing. On all models, air temperature sensor thermistor changes resistance with respect to temperature. High temperature causes low resistance. Low temperature causes high resistance. A reference voltage (supplied and monitored by PCM) is modified by sensor resistance. PCM uses this information to help control fuel injector(s), ignition timing and EGR operation.