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ECU probably guestimates the values when connection is lost completely .... the reason I think that is because I took a coolant temp sensor and gauge sensor connector off recently and ecu was still reporting same values as when they were connected when it couldn't have possibly known the correct temps anymore.

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i think..... (and this is from memory which doesnt mean much :D ) that if you removed the purple plug and it was at operating temp and idling that the idle should have hunted or the car should have stalled.

If it was still cold the cold start valve may have accounted for the loss of AAC valve.

If not it will be the brown plug that should cause the stalling

Thats the best i can think of

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