The PCM (Powertrain Control Module) on a 2002 Ford Windstar SEL is located
under the hood, typically near the firewall on the passenger side. However, its exact location can vary slightly depending on options and specific vehicle configuration. You might find it attached to the inner fender or secured to a bracket. It's usually a fairly large, rectangular black box with numerous connectors.
It's best to consult a repair manual specific to your 2002 Ford Windstar SEL for a precise diagram and location. You can find these manuals online or at auto parts stores. Looking at online images of the engine bay for a 2002 Windstar might also help you pinpoint it visually.