quattro Digest, Vol 139, Issue 3

[Huw Powell]

"one is closed till throttle body reaches about 20 degrees"

Not quite.  The idle switch opens when the throttle is barely cracked.

Since its only purpose is to tell the ECU to run the ISV, and to cut the 
fuel if the RPMs are above about 1400, that's all it does.  Tell the ECU 
that no power at all is being requested.

"The next one is open until throttle reaches near wide open then it closes"

Pretty much.  The manual for the correct car (4kq, 2.2l CIS-E, too lazy 
to see if I still have one) should have a protractor diagram for it.