Originally Posted by
Buzz
The EFI Connection schematic appears correct for Gen III (specifically early Gen III).
TCC brake circuit to PCM is a "normally closed" circuit - PCM receives 12 volts of power when brakes are NOT applied - this is used to control TC lockup.
Cruise Control brake circuit is a "normally open" circuit - PCM receives 12 volts of power when the brakes ARE applied - this is used to disengage Cruise Control (for decel or a stop).
What year, make, and model is your donor engine wiring harness from ?
Have all of the GM schematics .....
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