The AAPTS sensor is to measure Ambient Air Pressure and Temperature. "Ambient" is a relative term. In this case it means air inside the body, near the air intake snorkels.I dont think in works for ambient temp. I think its just for the engine mapping, but I could be wrong:dontknow:
The sensor also contains a barometric pressure sensor. Moving the sensor into a direct air stream or low pressure vent area can throw that reading off, which could adversely affect the fuel injection and ignition timing. If you are not having engine management issues, the pressure function probably doesn't need to be tested.
It doesn't do as much as you think. Part of the reason these read high is that the temp inside the body is higher than the outside. The sensor is likely reading more accurately than it appears. The only way to tell is to check the reading when the Spyder is cold and has been sitting for several hours. That reading should be within two degrees of the actual air temp. IAs stated above, if this sensor is reading incorrectly, it may give the incorrect information to the computer. This could cause all kinds of performance issues. I would think that getting it fixed would be something that should be done.
Sorry to resurect an old thread... but my 2013 RT ambient temperature is way off all of the time. It reads a minimum of 10 degrees to high. Riding at noon today, the temp is 78*. Spyder reads 109 after being parked in the shade, dropped to 100 at 50 mph down the road.
It's off this far when i back out of the garage in the morning too... anyone else? I have about 400 miles on it.
The sensor could be bad, or the dealer could have failed to properly mount the sensor during prep. I'd see the dealer and insist that it be corrected. They all tend to read high, especially after parking in the sun or after a hot restart, but yours is more than average. There is a test procedure in the shop manual