Instead, a mechanic would use a scan tool specifically designed for that year and model (or potentially a very versatile older scanner) to read the codes. These codes are usually represented by blinking lights on the check engine light itself, or sometimes by a code displayed on the instrument cluster. The codes are often interpreted through a service manual specific to that vehicle's year and engine type.
To get the codes:
* Consult a Repair Manual: Your best bet is a factory service manual for a 1992 Chevrolet Caprice Classic. It will have the code definitions for your specific vehicle and engine (e.g., 305 TBI, 350 TBI, or other variants).
* Use a Scan Tool: A scan tool designed for OBD-I vehicles from that era will be needed to read the codes electronically. Many auto parts stores may have basic OBD-I scanners, but they may not be comprehensive.
* Blink Codes (If Applicable): Some systems use a series of blinks of the check engine light to indicate the code. Again, the manual will explain the blinking pattern.
Without the specific diagnostic tool or manual, it's impossible to list the codes and their meanings. You *must* use one of the methods above to obtain and interpret the codes.
