* No OBD-II Port: Forget looking for the standard OBD-II port under the dashboard; it doesn't exist on this model year.
* Diagnostic Connector: The 1991 Stealth has a diagnostic connector, but its location and pinout are crucial. You'll need to locate this connector – it's usually under the dash, near the steering column, but its exact placement can vary slightly. A service manual is invaluable here.
* Methods for Retrieving Codes:
* Using a Dedicated Mitsubishi Diagnostic Tool: This is the most reliable method. These tools were specifically designed to communicate with the car's computer system and retrieve trouble codes. Finding one might require searching online automotive forums or specialty tool suppliers. Ebay or similar sites may be a source, but ensure compatibility.
* Using a Test Light: This is a more DIY-friendly (but less convenient) option. You would connect a test light to specific pins within the diagnostic connector, turn the ignition on, and observe the light's flashing pattern to interpret the codes. This requires a detailed understanding of the pinout and code interpretation for your specific engine and year. Again, a service manual is absolutely essential.
* Flashing Check Engine Light (Less Likely): Some older systems might flash the check engine light itself to indicate codes, but this is not a reliable method on the 91 Stealth.
What you absolutely need:
1. A 1991 Dodge Stealth (Mitsubishi 3000GT) service manual: This is non-negotiable. It will show you the location of the diagnostic connector, the pinout, and the code interpretation charts. A Haynes or Chilton manual might suffice, but a factory manual is preferable.
2. Either a dedicated Mitsubishi diagnostic tool or a test light.
Caution: Be careful when working with the vehicle's electrical system. Incorrect connections can cause damage.
In summary, locating a service manual and figuring out how to access the diagnostic connector is your first step. Then, you'll need to either find a suitable diagnostic tool or learn how to interpret the codes via a test light method, guided by your service manual. This process is significantly more involved than using an OBD-II scanner.
