CHEVROLET S-10 COMPUTER READ CODE

Can I Ground A Terminal On My Data Link Connector To Read The Flashes For A Fault Code? And If So, What Number Terminal? I Have An Engine...

I Have A 96 S-10 With A 2.2 L Motor. I Just Bought It And Got It For A Very Cheap Price. It Runs Very, Very Rough. The Man I Bought It From...