On my 2000 civic si. I have almost all the wiring on my ZT-2 done. I am confuse with the simulated narrowband output. If im replacing the secondary o2 sensor and splicing it into the heater signal. Their are two wires one is for the Control (SO2SHTC Pin-A8) or the Sensor (SHO2S Pin-A23). Which one do I splice into?

Also i need to wire the RPM signal for the ZT-2. It needs to be spliced into the tach signal. Which pin or pin name do i look for?

If anyone can help me and take pictures of their installs.

Thanks H-T

Picture for thread attention.

 

I dont know off the top of my head, but all of the wires are labeled in the Helms manual. I have the wiring colors and pinouts of the ecu for 94 and up tegs, but not Civics. If you can find a Helms, or someone willing to scan the pinout page for you should be set.


EDIT: Search for Katmans site, he has quite a few ECU pinouts on his Tech page, I believe its on the FFsquad page... hope it helps to point you in the right direction.

 

I now just need to know do i cut the control wire or the sensor wire for the simulated narrow band.

 

you said secondary o2. You dont want to put it in after the cat!!!! so you need your primary o2. Im still wondering the same thing about the NB wire. I cut my o2 wire and put the purple wire onto it and got a CEL light im lookin all over for the answer

 

Anyone figure this out???

 

If you use a stock ECU, it is expecting a narrowband O2 sensor signal. Whether this signal comes from the stock O2 sensor itself or the wideband simulated output, should not matter - but it has to come from somewhere.

The stock O2 sensor has the response of a light switch with the trip point being 14.7:1. So basically, the controller box of the WB O2 sensor takes the signal from the WB O2 and compares it against a threshold - if its below it, spit out .1v....if its above it, it will spit out .9v. Can you see how its simulated but in reality it still uses the actual WB O2 signal - it just has to modify it to keep the stock ECU happy.

So the original poster might have things a little backwards because you do not use the simulated narrowband output of the WB controller box to feed the secondary O2 sensor input of the ECU - you use it to feed the primary O2 sensor input.

When you eliminate the catalytic conveter is when you need to do something about the 2nd O2 sensor (and its heater circuit).

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nicklk &raquo;</TD></TR><TR><TD CLASS="quote">Anyone figure this out???</TD></TR></TABLE>

So, did that help or you still need something clarified?