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As equipped from the factory, the 22RE never had electronic idle control.
There is an auxillary air valve attached to the bottom of the throttle that provides for cold idle and as the coolant that passes through it warms up, it closes. There is an idle air bypass screw located on the throttle that is there soully for the purpose of adjusting the idle, which is necessary occasionally as the throttle collects some dirt, or the throttle shaft wears over time. If it has to be screwed all the way in then there is something wrong, such as an improperly adjusted throttle stop, stuck open auxillary air valve, bad A/C idle valve, etc...
There is also a vacuum operated valve on the plenum that allows for a slight increase in idle speed when the A/C is on if it is so equipped. A Vacuum switching valve located on the valve cover sends vacuum to that valve when there is power to the A/C clutch.
The Idle air bypass screw can be taken out, as it is simply a fat screw with a tapered end. The o-ring that is there not only provides some friction, but it also seals the threads. You could use most any o-ring that will fit around it and allow for some friction to keep it from vibrating loose. I would recommend appling some silicone grease such as Sil-Glide to the oring when you reassemble it so that it will continue to move freely for years after replacement.
More information on this topic can be found in the engine controls portion of the Toyota Factory Service Manual, or on the Toyota Information System (TIS) if you have a subscription.
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