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As for idle speed, with the transmission in "D", mine is right on 600 rpm (dead-on the third mark between the tachometer 0 and 1000 marks), and 700 rpm with the AC. These readings are at normal engine operating temperature (engine is completely warmed-up). They are both between 800 and 1000 rpm when the engine is cold (again transmission in "D"). My fisrt-start cold idle speed (no AC) is around 1200-1500 rpm (depending on just how cold) with the transmission in "P".
As I understand it from the local Lexus technician I talked to, and from my experimentation with various settings of the TPS, all idle speeds are set by the ECU (computer) and cannot be changed. TPS adjustments will not change the idle speed on these vehicles.
Word of caution about changing the TPS setting. They are very touchy and can affect engine performance (again I'm speaking from experience). Refer to prior messages on this town hall discussion for more details. Q45man and RODDMOD11 have some pretty good discussions in reference to message #405.
Anyway, hope this helps. Good luck ...
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