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Home >> Land Rover >> 2022 >> Defender 90 S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Electronic Engine Controls - V8 S/C 5.0L Petrol -- Defender/L663) >> Electronic Engine Controls - V8 S/C 5.0L Petrol (G2796672) >> Description And Operation >> Electronic Engine Controls - V8 S/C 5.0L Petrol (G2796673) >> Description >> Ambient Air Temperature Sensor

Ambient Air Temperature Sensor

WARNING: This page is about a different variant/trim than selected.
NOTE: Disconnect the startup battery when remove or install the left door mirror. Failure to do this causes the 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.
G15306803Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

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 AAT  sensor is a NTC  resistor. The AAT  sensor allows the 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 for use by other control modules.

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).

For additional information, Refer to: AIR CONDITIONING

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