I can't get any codes off my car. I hook it uo to the little thinga-ma-jig that I bought at autozone. All it does is cause clicks and revs up the engine. The rev does not go back down and no codes are given. I had the computer upgraded about a year ago when I put in my new tranny. Could the computer be going bad or could it be the code scanner is malfuctioning? The car runs good I just wanted to check for a few minor things.