Originally Posted by ZAHANMA

Unplug your Ambient temp sensor from the driver's side lower louvre. Then go check the cabin, it will read one of two things...either -36 or 136 ( or something like that). That is how I found it. The IAT sensor does control fuel/advance, but one parameter is also knowing what the ambient temperature is.

This is also about keeping the whole engine from being well below operating temperature, which is what would happen if the outside temp really was -36.