The PCM's location varies slightly depending on the specific engine and options. However, it's most commonly found under the hood, either near the firewall or mounted on the inner fender. It's often a fairly large black box with many connectors.
To locate it precisely, you'll need to:
* Consult your owner's manual: It should have a diagram showing the location of major components, including the PCM.
* Use a repair manual specific to your 1993 Ford Ranger: This will give you much more detailed diagrams and information.
* Search online: Search for "1993 Ford Ranger PCM location" along with your specific engine size (e.g., "2.3L," "2.9L," "4.0L") for more targeted results and possibly images.
Keep in mind that other control modules handle other vehicle systems (like the body control module for things like lights and wipers) and are located elsewhere in the vehicle. But the PCM is the primary one commonly thought of as "the computer."