Air Temperature Sensor ( Ambient / Intake ): Description and Operation

Intake air temperature sensor (IAT Sensor)






This is another resistive sensor, located in the body of the air cleaner. The resistance varies with changes in air temperature The signal from the IAT Sensor is used to retard the ignition timing if the air temperature rises above 55 °C. If the sensor is disconnected or failure occurs a default value will be supplied to the system. The default value selected will represent normal operating conditions. The fault may not be evident to the driver, there may be slight power loss in high ambient temperatures. The fault is indicated by illumination of the malfunction indicator light (MIL) on North American specification vehicles.