Boost/Pressure Sensor Mod: Wire question..
 

Hey guys. I was following AaronCake's writeup on engine grounds, but I just had a quick question. It says to ground the brown/black wire (for '86-'88 cars). I don't have that one.. So I'm just assuming that the black wire is my ground, even though it says it's for '89-'92 cars. Mine is an 88 by the way. Is this correct? I just wanted to ask before I grounded something I shouldn't have.

ground the wrong one and you will blow the EGI fuse. Ask me how I know.

Good thing I asked... So what one is it then?

Also... Here's mine.

http://img138.imageshack.us/img138/8...twiringoo0.jpg

So.... Maybe just ground the black one then... Hm...

Check the FSM.

Late in '88 some of the harness changed. Trying to fix and update stuff for '89-'92, I believe.

according to ECU pinout, PIN 2C is GROUND on ECU and connects by B (Black) wire to pressure (boost) sensor

I have same colors like yours on S4 car and i am going to add ground to Black wire......

Black White goes to ECU pin 3L (Main Relay)
Brown White goes to ECU pin 2A (V-Ref)
Brown Red goes to ECU pin 2B (Boost Sensor)