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Home >> Land Rover >> 2015 >> Range Rover Autobiography >> Repair and Diagnosis >> External Pages >> Different car >> Section 10 (Electronic Engine Controls - TDV6 3.0L Diesel -- Range Rover/L405) >> Electronic Engine Controls - TDV6 3.0L Diesel >> Electronic Engine Controls (Description And Operation) >> Description And Operation >> Description >> Ambient Air Temperature Sensor

Ambient Air Temperature Sensor

WARNING: This page is about a different car, the 2018 Land Rover Range Rover, 2017 Land Rover Range Rover, and 2016 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.
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The Ambient Air Temperature (AAT) sensor is a Negative Temperature Coefficient (NTC) thermistor that allows the Powertrain Control Module (PCM) to monitor the temperature of the air around the vehicle. The PCM uses the AAT input for a number of functions, including engine cooling fan control. The PCM also transmits the ambient temperature on the High Speed (HS) Controller Area Network (CAN) chassis systems bus for use by other control modules.

The AAT sensor is installed in the left exterior mirror, with the bulb of the sensor positioned over a hole in the bottom of the mirror casing.

The PCM supplies the sensor with a 5 V reference voltage and a ground, and translates the return signal voltage into a temperature.

If there is a fault with the AAT sensor, the PCM adopts a default ambient temperature of 20°C (68°F).

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