Obd Can
Obd Can

How do you retrieve computer codes from an OBD-I 1990 Cherokee?
I don't have OBD-II so I can't use a scanner, nor do I have a check engine light and would like to know how to get error codes to tighten things up after the major repairs i made. Thanks.
There was such a thing as OBD-I scanners. Back in the days before OBD-II, they came with separate software for each car make, and of course, separate cables because they all used different terminals. Not sure if they still make them. Some high end OBD-II scanners can read them if you buy the adapter cables too. As far as Autozone, from what I've heard, they only do OBD-II vehicles.
If all you want to do is read the codes, there is one alternative that might work on your Jeep. Thexton still apparently makes a tool that has an LED light built into it, that you can use if you don't have a check engine light. I found an example of it here, just like the one I bought about 25 years ago;
http://www.metroblaze.com/store/index.php?c=2&n=15690151&i=B000J532WY&x=Computer_Trouble_Code_Access_Tool
I'm not familiar with the seller, but at least you know what to look for this way, and also, like I said, I'm not sure if it will work with your Jeep, which might depend on which system you have.Could be a Chrysler setup, or could be a Renault sourced system called Renix.
I did find a pic of where the data link connector for 1990 Jeeps are supposed to be, which is where you would need to plug this tool in;
http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/0a/9b/75/medium/0900c152800a9b75.gif
I used to work on some Renault Alliances way back in the day. They actually sold a pretty fair number of them. They had a different setup for probing the computer. 2 little rectangular boxes with pins, with a sawtooth pattern in between them. If you have those, then the Thexton tool won't work on that.
But one thing that all these OBD-I vehicles had in common, is you could also use an analog voltmeter to read them, if you know which terminals to probe.
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