1994 & 1995 GM vehicles were equipped with several different engine computer systems. Follow these steps, in sequence to determine what diagnostic tool is right for your vehicle:

1. 1.Find the PCM (Powertrain Control Module) in your vehicle:
   • If the PCM is a black box with cooling fins located under the hood, your vehicle is most likely OBD II.
   • To confirm that your vehicle is OBD II-compliant, check the Emissions Decal located in the engine compartment.
   • If you determine that your vehicle is OBD II compliant, use any of the AutoXray Scan Tools or Code Readers.
   • If the PCM is a silver box located in the interior of the vehicle, proceed to Step 2.
2. Find the DLC (Diagnostic Link Connector) under the dashboard, usually on the driver's side:
   • If the DLC is a 16-pin D-shaped connector, your vehicle is OBD I-equipped, but with the OBD II connector. The proper tool is an EZ-Scan 5000, EZ-Scan 5100, EZ-Scan 6100 or EZ-Scan 6000 using the blue GM Manufacturer specific cable 20211.
3. If the DLC is a 12-pin rectangular connector:
   • The proper tool is an EZ-Scan 5000, EZ-Scan 5100, EZ-Scan 6100 or EZ-Scan 6000 using the black GM OBD-I cable 20110.