I just bought the diagnostic chart from Helm but it was only sold in packs of five so I have four extras. It is a small 20 page pamphlet that has all the diagnostic codes plus descriptions of the inputs, outputs, data and overrides for each system. It covers all the 1994 models. I’m giving them away so if you want one, respond to this message and send me a private message with your address. I’ll send them to the first four people who respond.