pulling codes

1994 CHEVROLET BERETTA
160,000 MILES
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SMEDLY
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  • 10 POSTS
what code reader can i use for a 94 gm not all obd 1 readers work on 94 or 95 gm
Jan 18, 2012 at 5:40 PM
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KASEKENNY
  • ✓ASE Certified Mechanic
  • 18,907 POSTS
  • ASE Certified Mechanic
You don't need a scan tool to pull these codes.

Here is a guide that will help with this, and it has good info that will help.

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

Below you will find the wiring diagram and explanation on how to pull the codes. Basically, if you jump any of these ports to the ground terminal with the key on you will get codes if there are any in these modules.

Please run through this info and let us know what questions you have.

Thanks
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Feb 14, 2022 at 7:14 PM
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