OBD engine light on all the time

WAINEE1

MEMBER
1995 BUICK REGAL
3.8L
V6
2WD
AUTOMATIC
114,069 MILES

Changed computer and chip.
Changed coils and ignition module.
Changed crank and cam sensor.
Cleaned air flow sensor.

And can't still get the diagnostic meter to hook up to the system. Check engine light stays on and when I put my meter on it, it says can't communicate. Car runs and starts and drives great! Also, no vacuum leaks either. Both o2's have been replaced too.

Again I just can't connect to anything. This is a OBD1 system not a OBDII.

Thanks a bunch.

6 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny.

Were you using an OBD1 adapter to retrieve codes? Have you tried using the old school way by connecting a jumper wire to terminal a and b? Here is a tutorial on how to retrieve with a jumper wire:

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Hope this this helps and thanks for using 2CarPros.

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Sunday, August 30th, 2020 AT 1:17 PM

WAINEE1

MEMBER
1 POST

First, yes I am using a OBD1 Connector. I have tried several. Second, yes I have jumped the two terminals with no luck. The check engine light just stays on.

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Friday, September 11th, 2020 AT 3:36 PM

WAINEE1

MEMBER
1 POST

I did find out the ground wire has some very low voltage going through for some very strange reason.

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Sunday, September 13th, 2020 AT 1:12 PM

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

It sounds like you have a bad ground. this guide will help test it:

https://www.2carpros.com/articles/how-to-check-wiring

and

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Please run down these guides and report back.

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Sunday, September 13th, 2020 AT 1:12 PM

DANNY L

MECHANIC
5,648 POSTS

Hello again.
Let us know if you need any wiring diagrams and keep us updated if you find a short or bad ground. Hope this helps and thanks again for using 2CarPros.

Danny-