What you might be thinking of depends on the specific problem:
* If you're experiencing a drivability issue (stalling, rough running, etc.): The best approach is to have the codes read by a professional mechanic using a scan tool. This tool will communicate with the ECM and reveal any stored trouble codes that indicate the source of the problem. Resetting anything without knowing the root cause will likely do nothing.
* If you've replaced a sensor or component: After replacing a sensor (like the oxygen sensor, mass airflow sensor, or throttle position sensor), the ECM sometimes needs some time to learn the new sensor's values. This "relearning" period usually happens automatically as you drive the truck. There is no manual reset required in most cases.
* Battery Disconnect: Disconnecting the negative battery terminal for about 30 minutes might clear some temporary memory issues. This is a crude form of reset but won't solve underlying problems. After reconnecting, you might need to reprogram your radio presets and possibly the clock.
In summary: There's no single "computer reset" button or procedure. Focus on diagnosing the problem instead of trying to blindly reset the ECM. A proper diagnostic scan is the most efficient and effective method for troubleshooting issues with a 1992 Chevy truck's engine control system.
