Blink Codes (Limited Information):
The 1996 Silverado's check engine light (CEL) can flash a series of short and long flashes to indicate a *potential* problem. This is not a comprehensive diagnostic; it gives a limited, often cryptic, indication. To attempt this:
1. Locate the diagnostic connector: This is usually under the dashboard, but its exact location can vary. A wiring diagram for your specific truck year and model will be helpful.
2. Jump the connector: You'll need to short two specific terminals in the connector. Again, a wiring diagram is critical here, as the terminals to jump are not standardized and vary by year. Improperly jumping these pins can damage your vehicle's computer.
3. Observe the Check Engine Light (CEL): The CEL will flash a series of short (less than 0.5 seconds) and long (1.5 seconds) flashes. Each series represents a code. You'll need to find a chart that translates these flash patterns into potential problems for your specific year and engine. These charts are available online, but their accuracy can be questionable depending on the source.
Important Considerations:
* Accuracy: Blink codes are notoriously unreliable and often don't give a precise diagnosis. They can offer a clue, but you'll likely still need a scan tool for a proper diagnosis.
* Damage Risk: Incorrectly jumping the diagnostic connector pins risks damaging your vehicle's PCM (Powertrain Control Module).
* Year and Engine Variation: The exact procedure and interpretation of blink codes can vary slightly based on your specific Silverado's engine and options.
Recommendation:
While you *can* try the blink code method, it's strongly recommended you get a scan tool. Even a relatively inexpensive OBD-I scan tool designed for your vehicle's year will provide far more accurate and useful information than the limited blink codes. A scan tool will provide a much clearer and more definitive diagnosis, saving you time, frustration, and potentially costly misdiagnoses.
