Quick search online and found a pic. This will adjust the idle for 3.0 v6. CCW will raise it and CW will lower it. Its just a needle pointed screw that adjusts the airflow. 22 re looks the same just on top of the TB.
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The following user(s) said Thank You: GregK, CLAUDIO CORDOVA
Hi Mike, hey if you have any pics of this I'd appreciate it. I think I've possibly seen this on older Toyota's, these engines always had mystery about them . It often seemed like things should be obvious- like I'm just looking at this thing, and it felt like thinks were somehow hidden.
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Gadgetman Reno, NV
Here's some pictures of the early Toyota TBs. First one is the 3.0 the "idle adjustment screw" is on the side just behind the accelerator cable spring. The second pic is for the 22re, circled red, its on top of the TB. I was surprised years ago, when a mechanic friend showed me this. Being able to adjust idle on an EFI system, almost like a carb came in very handy.
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I would bet that those idle adjust screws are to allow for fine-tuning of the variances allowed in manufacturing (and aging of the vehicle)...throttle cable stretch, miniscule vacuum leaks - these sorts of things.