Hey, I searched but couldnt find anything. I need to get this thing hooked up in next 30 mins!. I got the power and ground taken care of, just not for the 02 sensor. But I dont want to splice it into the o2, I want it at the ECU. Does anyone know which wire to tap at the ECU? 87 Base model

 

Goto apexi-usa.com look under the instructions for their auto timers, they should have the pin out.

 

Pin 2D (2nd from right on the bottom of the 9x2 plug), grey wire.

 

Thats what I have it hooked up to but its not working for some reason, the light just stays in the last spot on the rich side. Doesnt bounce back and forth or anything.

 

Ok, nevermind. The wire wasnt tapped all the way. It works now, I like it. Haha. Im running pretty lean though.

 

Lol to bring this thread back, is it the same ECU plug on an s5 as s4 for the o2 sensor?

 

No. Look in the EFI chapter of the FSM. The ECU plugs are detailed in there.

 

The pin out may be different but if you pull the wrapping back about 3-4 inches you can see the O2 sensor wire.

It is usually grey with a metal grounding strap like wire coming out of it as well.

 

doesnt it usually have some sort of ground isolator?

 

Does anybody happen to know which pin out it is on an s5?

 

for my TII its a black wire in the middle plug, i think its the 4th wire from the left. but its solid black.

 

 

The pictures of the ECU pins in the FSM us considerably better than that one, and allows you to double-check the pin's description to be sure you have the right one.

 

i dont think theres anything URGENT about hooking up a a/f gauge to a 1 wire o2 sensor

 

Thanks for the diagram..lol no it was urgent about three months ago, when I hooked it up to the s4, but I sold that car and got an s5 and was just wondering. Nah, I hook it up to the ECU pin out instead of the actual o2 wire.