You can find the diagram in a Quadra-jet carb repair manual, which is available at most auto parts stores.
Look on the throttle body opposite of the accelerator linkage, most of them are there.
You can find the wiring diagram for a 1991 Suburban at various auto part stores. You can also check in the owner's manual.
online
chiltons manual at the library.
try google images
Code 12 displayed during self test, per Ford, takes you to test TP, for the throttle position sensor. It could be the failure of the throttle position sensor, idle speed or throttle stop adjustments, throttle shaft or linkage, and/or cruie control linkage.
You can find the diagram of the throttle body on a 2000 Ford Focus with 2.0 SPI at various auto part stores. You can also check in the owner's manual.
The throttle body diagram for the 1988 Honda Prelude is found in the maintenance manual of this car. It can be obtained as a print out from an automotive store as well.
autozone.com has alot of helpful info
i need a pictrure of the cooling system diagram for 1995 Chevy suburban
It is located on the throttle body... Just find the throttle linkage (its the thing that moves when you press on the gas) and its just right across that on the throttle body, held in place with 2 torx screws. Three wires plug into it
most auto parts dealers have or can print out a routing diagram.