On-Board Diagnostic System

Hi All,

Been searching the forum all afternoon with no luck. I have a 2001 Chevy Venture in excellent shape. Just bought it from my brother and when I went for emissions testing they said they had no connection to the OBD plug under the steering wheel. My bro had the same problem years ago and he said it needed a new fuse. My question; Where is the darn fuse for this? I have checked all the fuses and they look ok. Or is it something else I missed. It said in the manual that a low battery can cause this. The battery has been charged a few times in the past but seems to work fine now. Any suggestions will be greatly appreciated.

Thanks,
Mike

I can't help you right off hand for the Venture (I'm at work), but my 97 Cavalier had an identical problem. It ended up that the +12V for the OBD connection was shared with the cigarette lighter. The lighter was damaged long before I purchased the vehicle and had blown the fuse. I removed the lighter, replaced the fuse, and the OBD connector started working again.

I can't help you right off hand for the Venture (I'm at work), but my 97 Cavalier had an identical problem. It ended up that the +12V for the OBD connection was shared with the cigarette lighter. The lighter was damaged long before I purchased the vehicle and had blown the fuse. I removed the lighter, replaced the fuse, and the OBD connector started working again.
You hit the nail right on the head. It was exactly the same deal for my venture as it was for your car. I thought I had checked all the fuses but the "car lighter" fuse I must have overlooked. Switched in a new one and the OBD worked fine. Thanks a bunch. You really saved me a lot of time and frustration.

Mike