Mini Cooper Air Temp Sensor
December 14, 2007 by donminimania
dont know if this will help but here is an clip from http://www.gaima.co.uk/peter/RoverMEMS.pdf
“The ATS is mounted in the air inlet casing (MPi) or air filter casing (SPi), and measures the air temperature before it enters the inlet manifold. Because the density of air varies in inverse proportion to the temperature, the ATS signal allows more accurate assessment of the volume of air entering the engine. The open-circuit supply to the sensor is at a
S.O-volt reference level, and the earth path is through the sensor return. The ATS operates on the NTC principle. A variable voltage signal is returned to the ECM based upon the air temperature. This signal is approximately 2.0 to 3.0 volts at an ambient temperature of 20°C, and reduces to about 1.S volt as the temperature rises to around 40°C.
Although the air filter casing used on SPi models contains a thermal valve system, the thermal valve has no bearing on the AFR, and the air temperature is calculated solely by reference to the ATS.
