I have a obd to obd1 setup. The obd1 conversion wire has its own yellow check engine wire coming off of it. You're just supposed to growing the yellow wire and it show you the codes. When I tried that it didn't work, so I checked to see if it had power and it does not. Every thing else works great, just no check engine light. Any ideas? Checked all wires by the ecu and nothing is lose. Thanks