The Power Control Module (PCM) in a 1994 S10 pickup with a 4.3L engine is located
under the hood, on the driver's side, typically
mounted to the inner fender well. It's a fairly large rectangular box, often black, and will have numerous electrical connectors attached.
However, the exact placement can vary slightly depending on the specific trim level and options. It's best to consult a repair manual specific to your year and model for the precise location. You can often find these online or at auto parts stores.
