When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Either use the paper clip ground---do a search to find "how to", or go to Ebay and buy an OBD1 code reader or go to: www.gordonkillebrew.com You have three choices.
Look on EBay for a GM TEchline TECH1 or 1A scanner. This is the tool that is called out in the FSM. You have to have the correct module for your year car and the system you are working on. The Tech1's usually go for $300.00 or more.