My car is giving me codes 2121 and 2123. I have ohmed out the switch and was fairly positive it was withing spec. Can anyone tell me which wires to check continuity at the control unit? Thanks!
Joel

 

Well I guess I will answer my own question in case someone else needs it:
ICU=Ignition Control Unit, Drivers side kickpanel
FIC=Fuel Injection Control, Passenger side kickpanel

The Blue/White wire that terminates at the idle switch originates at Pin 7 of the ICU also Blue/White.
There is a second Blue/White wire that also runs from Pin 7 of the ICU to Pin 28 of the FIC also Blue/White.
The White wire that terminates at the WOT switch originates at Pin 9 of the ICU also White.
There is a second White wire that also runs from Pin 9 of the ICU to Pin 31 of the FIC.
The Green/Red wire at the Throttle switch assembly is the ground circuit and joins up with several other Green/Red ground wires from other circuits. These after the junction are grounded by a Brown wire.
Hope this helps...
Joel

 

Here is a cool website...if you have a 1990 100(q)

www.audi-club.ru/txts/audi100_90_wiring.pdf