the ecu test plug is on the fire wall near the tire. the book says on pass side, but mine is on driver side. its between the wheel and the driver seat in that little corner of the engine bay. there are 2 plugs in the cover. pull both out. there is a small 1-hole plug and a large one somewhat shaped like a triangle. there are 6 holes, 4 across the wide end and 2 on the short end. use jumper wire to bridge the left hole in bottom, small row. + end of electrical tester in + end of battery and - end of tester into hole 1 up and 1 to the right of the hole with the jumper in it on big plug. there are 2 tests, key on engine off, and key on engine running. or koeo and koer. koeo - connect ecu tester as described above and turn on the key without turning on the car. the needle will full sweep with a 1 sec pause between code numbers and 4 sec pause between codes. 91 and above slipped in 3 digit codes, but most are 2. this process is a lot easier if you have the haynes book pictures easier than trying to figure out what i said, lol. the book only 15 bucks and has all the codes. if you can't get book, post the codes on here and i'll help as fast as i can. | 
