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Home >> Jaguar >> 2019 >> XF S >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Electronic Engine Controls - INGENIUM I4 2.0L Diesel -- XE/(760)) >> Electronic Engine Controls - INGENIUM I4 2.0L Diesel (G1817213) >> Description And Operation >> Electronic Engine Controls >> Description >> Ambient Air Temperature Sensor

Ambient Air Temperature Sensor

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G11308572Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

The Ambient Air Temperature (AAT) sensor is a Negative Temperature Coefficient (NTC) type sensor. The AAT sensor allows the Powertrain Control Module (PCM) to monitor the temperature of the air around the vehicle.

The PCM uses the AAT sensor input along with other in-car temperature sensors to control:

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

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

If there is a fault with the AAT sensor, the PCM calculates the ambient air temperature. The PCM uses for the calculation the temperature input of the Mass Air Flow and Temperature (MAFT) sensor. If the AAT sensor and the temperature inputs of the MAFT sensor are all faulty, the PCM adopts a default ambient temperature of 25°C (77°F).

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