Dumb question, how to access ford trouble codes
The car in question is a '93 ford tempo. Anyone know for sure how to access the codes without a scanner? I found the data link connector. Found an internet diagram how to hook it up with either a volt meter or test light. The picture doesn't say to do it with the key on or off. I don't want to guess. Electronics don't hold up under a lot of abuse should I do it wrong. Thanks.