Find the data connector behind the passenger side front fender. Take the cover off. Take a jumper wire and do connect as follows:
Make sure the car is off. Connect the wire.
Get in the car and turn the car on (but don't start it).
Wait a few seconds. You should hear the fan rev up and then your check engine light will flash.
It will flash 2 sets of codes, one is the current problems, the other is problems in memory. The separator code is 1-1-1.
Either post your codes or buy a Haynes repair manual. It will give better instructions to connect, and give all the error codes.
Hope that helps.