factory o2 is a one wire
d16z6 o2 (what is getting put in) is a four wire (2 black wires, a green, and a white)......also going from p05 ecu to a p28

green goes to pin D22 on the ecu
white goes to pin D14 on the ecu
......now the two black wires....A25....A6...does it matter which wire goes where? I would guess not since they're both black but I want to make sure.

I have already searched this, but there was no clear info on the black wires,
thanks.

 

Actually the green wire goes to A6 I believe, and two black wires go to A25 and D22.

You are correct on the other ones, however.

 

Well usually the engine harness has the 4pin plug for the o2 sensor.

 

https://honda-tech.com/zerothread?id=460720
https://honda-tech.com/zerothread?id=479941
https://honda-tech.com/zerothread?id=414847

there are 3 (could've linked more) sources that say that the wiring stated above is correct....

and even if the black wires go to (example) c33 pin and a b12 pin (example)....how do I know if one black wire goes to a certain pin???
thats my main question.....but thanks though.

 

most cx civics do not come wired for a 4 wire o2 sensor.....MOST come with a one-wire o2 sensor. I know there are some with a factory 4-wire sensor, just not mine.

that engine harness thing brings up another question. If I use my civic ex/si harness (d16z6) in the engine bay.....do I need to run any wires off of the 4-wire sensor to the ecu?

thanks.

 

Actually I believe the 92 CX is pre-wires for a 4 wire O2 sensor. All except for VX (which is 5 wire).

The EX/SI/DX is wired for a four wire O2 sensor. As for the 93-95 EG's, I don't believe they are. You need to add the pinouts (D22, A25, A6 and D14).

If you use an EX/Si harness, then you still need to add the pins from the shock tower harness to the ECU.

 

92 cx does, yeah....but mine is a 94.....so that doesn't help.

thats what I thought about the shock tower pins.....but I went to a junkyark today....

looked at passenger side engine harness......from a d16z6 del sol.....to a d15b8 95 civic cx. And it seems that the ONLY wires that are not in the non-vtec harness are the vtec wires. So if everything was the same besides the vtec part of it, then is the 4-wire o2 harness just wired into the engine bay harness itself?

I don't know.....I guess I'll just unravel my spare d16z6 engine bay harness and see where exactly those 4 o2 wires go.

 

i just checked my 93 cx wiring and it was pre wired for a 4 wire o2...there were wires going directly into the ecu...where i was supposed to add them

 

which should mean that the wires themselves (except the signal wire) probably connect inside the engine bay harness.....at least that what I think.....

thanks man

 

just check to see if the spots on the ecu where you are adding wires is already filled...