In a 1994 Chevy lumina which ports do you ground in the diagnostic connector to get the check engine light to blink the bad code?
Just found it myself. Short the top two on the right side. Have the ignition turned to "on" and then do it. You get X number of blinks, a pause, then more blinks.
Mine was 1 -pause- 2. 12 for me!
Insert the two ends of a paper clip into the A and B terminals of the ALDL connector. These terminals may or may not be labeled, but they will always be on the top right corner of the connector Turn the ignition key to the on position without starting the car. Watch the service engine light. It will initially flash code 12. That means the system is in diagnostic mode. Every code the computer has…