OK.
The ICV functions as it should with 12V applied to it (by me). I have continuity to the proper terminals on the CIS controller (no broken wires).
After these tests, I started it back up and check for power at the ICV. I had 6-7V.
I switched my meter to mA and went to test and as soon as my meter hit the terminals, the engine coughed and immediately dropped from cold start (high idle) to very low idle. After this point I could get no V reading at the ICV.
Now, I don't know if my meter brushed the housing in the ICV as I touched the pole. This would make a certain amount of sense, as the ICV seemed to settle into some kind of limp mode immediately. If I had done this last night, it would explain why I could get no reading at the ICV and why unplugging the ICV had no effect on idle speed.
So now I am waiting for the car to cool down & the computer to (hopefully) reset itself so I can try again. This time I will use a different set-up to make sure that I don't ground out (not that I'm all that sure I did the first time...).
I have a two other tests suggesting that the Throttle Valve Switch may be faulty in one position, but I can see no way that would effect idle with the A/C on...
[rant]Don't you just hate finding out that you spent the last 12hrs chasing your damn tail?!
Especially when you only have 36hrs of garage time...[/rant]