Here's how to do it:
1. Locate the Diagnostic Connector (DLC): This is usually under the dashboard, near the steering column. It's a rectangular connector with several pins. It might be covered by a panel.
2. Identify the correct pins: This is the crucial step and varies slightly depending on the exact year and engine of your 1992 Chevy pickup. You'll need to consult your owner's manual or a wiring diagram for your specific truck. This is the most reliable method. Trying to guess can damage your vehicle.
3. Jump the terminals: Using a jumper wire (a small piece of wire with alligator clips on both ends), carefully connect the two pins identified in your wiring diagram.
4. Turn the ignition key: Turn the key to the "ON" position (don't start the engine). The Check Engine light should start blinking.
5. Read the blink codes: The light will flash a series of long and short flashes. A long flash represents a "1" and a short flash represents a "0". For example, long-long-short-short would be 1100. Record these sequences. There will likely be multiple codes, separated by a pause.
6. Consult a 1992 Chevy pickup blink code chart: Once you have the codes, you'll need a chart that translates the blink code sequences into actual problems. You can usually find these charts online by searching for "1992 Chevy pickup blink codes" or specifying your engine size (e.g., "1992 Chevy pickup 350 blink codes"). Be sure to specify the exact engine.
Important Considerations:
* Safety First: Always disconnect the jumper wire before working on anything else in the vehicle's electrical system. Incorrectly connecting the jumper wire can damage your vehicle's computer.
* Wiring Diagrams: Finding the correct pin locations in your owner's manual or a repair manual is essential. Getting this wrong could damage your vehicle's electronics.
* Accuracy: Blink code systems can be unreliable. If you have any doubt, it's best to consult a mechanic.
* OBD I Scanner: Consider purchasing a relatively inexpensive OBD I scanner. These scanners are specifically designed for older vehicles and will read the codes automatically, eliminating the need for the blink code method.
Don't attempt this unless you're comfortable working with your vehicle's electrical system. If you're not, it's best to take it to a mechanic for diagnosis.
