b16a going into 93 civic vx and need pin#'s for 4 wire o2 conversion...

 

what ecu are you using?

 

p28

 

A6 for O2 sensor heater
D14 for O2 sensor signal

 

A6 - o2 heater control
A25 - o2 heater ground
D14 - o2 signal
D22 - o2 signal ground

 

Actually A25 is not a ground at all, it is a switched power. The way the O2 sensor heater circuit works, is the power comes from the chassis to the heater, and when the ECU deicdes to turn it on and off, it grounds out the circuit. It will work if you run the power from A25, but any of the black/yellow wires in the engine harness will work fine. As to the D22 O2 sensor signal ground, here's another place that you don't have to run back to the ECU, but can get a good ground at the thermostat housing.

 

Your VX isn't already wired for the 4 pin oxygen sensor or are you rewiring the motors loom??? Just wondering... Latez

 

I believe Hasport.com has an article in their tech section. They were sccm last year.

 

I'm just picking up where someone left off. I haven't seen the car, but they told me that this is all it lacks. I usually work on 88-91 civics&crx's so all the eg's are new to me and I just want to get it right the first time...thank for the info, very helpful.

 

So you can just run the 2 black wires coming from the o2 to chassis grounds?

 

No, one of the black wires goes to switched power, and the other goes to A6 on the ECU.