The ECM (Engine Control Module) on a 1988 S10 pickup is typically located
under the hood, near the passenger side fender well. However, the exact location can vary slightly depending on the engine and options installed. It's usually attached to the inner fender, often secured with bolts or screws. It's a relatively small, rectangular box.
To be absolutely certain, it's best to consult your owner's manual or a repair manual specific to your 1988 S10's engine and trim level. A quick online search for "1988 S10 ECM location" along with your specific engine (e.g., "1988 S10 2.5L ECM location") may also yield helpful images.
