The AAT sensor is a 2-wire thermistor-type sensor. The PCM applies 5 volts to the AAT sensor circuit. The sensor
changes the internal resistance as the ambient air temperature changes.
The AAT sensor is used as an input into the engine controls, particularly, engine coolant fan operation, glow plug system control and for diagnostics.
The AAT sensor is located in the passengers mirror.
IDS: AAT (temperature) and AAT_V (volts)