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Home >> Land Rover >> 2021 >> Range Rover Velar R-Dynamic HSE >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Electronic Engine Controls - V8 S/C 5.0L Petrol -- Range Rover Velar/L560) >> Electronic Engine Controls - V8 S/C 5.0L Petrol >> Description And Operation >> Electronic Engine Controls - V8 S/C 5.0L Petrol (G2318514) >> Description >> Ambient Air Temperature Sensor

Ambient Air Temperature Sensor

WARNING: This page is about a different car, the 2020 Land Rover Range Rover Velar. However, it is still accessible from the selected car via links, so may be relevant.
G14290178Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC
NOTE: Disconnect the startup battery when removing or refitting the left door mirror. Failure to do this will cause the Ambient Air Temperature (AAT) sensor to provide an incorrect temperature of -40°C (-40°F). This prevents the Air Conditioning (A/C) from functioning until the vehicle has been driven for 10 to 20 minutes.

The Ambient Air Temperature (AAT) sensor is a Negative Temperature Coefficient (NTC) resistor. The AAT sensor 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 FlexRay bus for use by other control modules.

The AAT sensor is located in the left door mirror. The bulb of the AAT sensor is positioned over a hole in the bottom of the door mirror casing.

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

If the AAT sensor fails, the PCM calculates the AAT from the temperature inputs of the MAFT sensors. If the AAT sensor and the MAFT sensors temperature are all faulty, the PCM adopts a default ambient temperature of 25°C (77°F).

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