on your ecu plug a (18 pins) you have (from left to right looking at the plug) a1-brown wire, a3-red wire, a5-lt blue wire, a7-yellow wire...then at a15-yellow/black wire. all on the top. they go here... a1 to injector 1, a3 to injector 2, a5 to injector 3 and a7 to injector 4, the yellow black...