What you might be referring to depends on the problem you're experiencing:
* Resetting the ECM/PCM: This usually involves disconnecting the battery's negative terminal for a period of time (30 minutes to a few hours) to allow the computer's memory to clear. This can sometimes help resolve minor glitches or stored trouble codes. Important: Disconnect the negative terminal only. Connecting and disconnecting the battery can cause problems with the radio code and possibly other settings.
* Clearing trouble codes: The ECM stores diagnostic trouble codes (DTCs). You can't "reset" the entire ECM, but you can clear the codes. This requires a scan tool, often called an OBD-II scanner (though the Bronco might use an earlier OBD standard, you'll still need a scanner). The scanner plugs into a diagnostic port under the dash, and you can then use the software to clear the codes.
* Other issues: If you're experiencing problems with other electronic systems in the Bronco (radio, power windows, etc.), the problem likely isn't the ECM and needs a different approach for troubleshooting.
In short, there's no "reset" button. Disconnecting the battery is the closest equivalent to a reset for the engine computer, but it's more of a power cycle. If you have specific problems, providing more details will help determine the best troubleshooting steps.
