* Powertrain Control Module (PCM) / Engine Control Module (ECM): This is the main computer controlling the engine. In a 1989 Bronco, it's typically located under the hood, often near the air cleaner housing or firewall. Its exact location can vary slightly depending on engine size and options. You'll likely find it attached to the inner fender.
* Other Modules: There are other modules for things like the automatic transmission, body control, and ABS (if equipped). These are generally located throughout the vehicle, often under the dash, behind interior panels, or in other less accessible locations.
To find the specific module you need:
1. Consult your owner's manual: This is the best place to start. It should have diagrams showing the location of major components.
2. Check a wiring diagram: A wiring diagram for your specific Bronco year, engine, and options will show the location of each module and its associated wiring harness. You can often find these online (e.g., online forums dedicated to Ford Broncos).
3. Use a repair manual: A Haynes or Chilton repair manual for your Bronco will have detailed diagrams and instructions.
Without knowing *which* control module you're looking for, it's impossible to give a precise location. The PCM/ECM is the most likely candidate if you're troubleshooting engine issues. If you can specify which system you're working on, a more accurate answer can be provided.
