I bought a code reader awhile back and threw it on the XJ. All other cars it loads quickly then I can scan it for.codes. but he XJ starts to load...there's a loading bar. Then pretty much stops. Only gets a quarter of the way. Idk if I need to let it sit for awhile or what. Any one have this happen? I don't have a check engine light. Oh and its a 96 XJ .4.0 ho auto. Thanks.

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My guess is a fuse might be out, that is all I can think of.

Your scanner doesn't read OBD1 apparently.

I thought all 96 and up vehicles had obd 2. Some 95 model years depending on production date. Just what I thought. So that would make mine obd 2. I think the fuse thing might be the problem. I'll need to check...

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96 is the first year of manditory OBDII.

Okay. You proved the scanner is a known good tool and the OBD debate is over. It's time for the issue at hand ie no communication with a scanner. I had this experience with my '99.

I suggest a close inspection of OBD connector contacts. Cleaning may help and it is worthwhile action for inspection purposes. Also, check integrity of each contact's wire- crimp by tugging each wire (not too hard, about a one pound tug is good). Recrimp or solder any wires/contacts that release (may get another connector a JY if necessary). Good Luck.

Thanks will do. Tomorrow I plan on looking at all the wires. I will deff see of any are loose. Sunday is my only day off....so all the house work and what not gets done then. Hopefully I get a a good bit of time to check the wires out.

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Does the engine run?

Ya. Runs great. Just bought he reader and ran it on other vehicles.no problem. Then my XJ wasn't working. There's no CEL. But I thought I'd read it anyways....

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no light ss in its dont work or is not on,ive heard post here of some year xjs certain scanners will not work but others will.

try reading this wayhttp://jeep-xj.info/HowtoECUcodes.htm

Well all wiring is fine. Fuse is good. But I did find this....a plug what wasn't plugged in....havnt plugged it in tho. I have a bulldog or whatever security system with remote start and all that. Didn't know if this needed to be unplugged for that. There is a white tag on it with the letter G. And a blue tag.

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The other end is there. So i can plug it in. Any ideas on what this plug does? When I get to work ill grab someone else's scanner and see if it works. Not sure why mine won't.

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Update. Fuses good. Wiring good. It will sit and "load" while the jeep is running. I'd I turn it off but leave it in the ON position. It cycles through a few screens then says failed to connect. Anybody? I let it sit for 20 minutes. Didn't move.

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I know this thread is 3 years old but did you have any luck? I have the same issue. I know my CEL is on bc of my down stream o2 sensor, but when I plugged in my buddies brand new snapon OBDI/OBDII scanner it says cannot connect. My wires are fine. Does anyone know which fuse it would be that relays to the port?