There is a two wire connector under the under the dash tucked up under the glove box or in that area. Jump the two connections with a jumper wire and turn on the key the check engine light should flash if there are any codes stored. Long flashes are the first digit and short flashes are the second digit. (For instance 3 long and one short would be a code 31. If there is more than one code stored then it will give them in the order they were set, so your best bet is to make sure to count the flashes more than once to make sure you have an accurate understanding of the problem. If the CEL comes on and doesn't flash that means no code is set and everything is fine or the problem is not related to any codes. Hope this helps any questions get a chiltons manual it usually tells you how to check for codes.