I have emissions coming up and I need to get my secondary o2 hooked up. I can only find three wires coming from the computer for the secondary o2. I am missing a ground. I looked at all the wiring schematics in the honda book but some parts don't make any sense. This is the only part left to do. I have tried a ton of grounds and none of them work. The CEL is off when I turn the key to position II but when I start it, after about 30 seconds it comes on. Can anyone give me a diagram on how to hook this up?? Any help is greatly appreciated!!!!!

 

By the way, it's a 96 ex ecu (obd2a) in a 97 dx hatch.

 

bump....I NEED HELP!!!

 

Final remaining wire connects to your purge valve. Take a look at it, its black and yellow. If you run a continuity test on that and the same wire on your primary o2 sensor, you will find they are the same circuit