Today I went to swap out my JWT modified Maxima ECU (with NITROUS)and put in my stock I30 ECU for emissions testing. The Maxima ECU throws all sorts of emissions codes, so it doesn't pass the tests. I did this same process two years ago without a hitch. However, something was different this time around.

Now there are 3-4 wires coming out the back of the ECU, which I don't remember seeing before. One appears to be a ground, another appears to be related to my Harlan RPM switch(gray wire), and then there are two other wires, a blue and a red one.




The red and blue wires are thin coming out of the ECU, then there's a connector of some sort, then there are another red and blue wire, although these are thicker than the other R/B wires coming from the ECU.



There are a few possibilities for the R/B wires off the top of my head:
1. I had some fake A/F gauge that I replaced with a real WB O2 sensor. IIRC, we tapped into some wires to get a signal for it, but now that I'm using a real WB O2 sensor, the old gauge is not in the car. I'm going to ask the installer if he remembers how he did the install.

2. Wires put there by JWT for nitrous purposes. I didn't do my nitrous install myself, but I believe those wires may be used to arm my system and switch over to my nitrous program.

3. Possibly wires for my WB O2 sensor? I kind of doubt this, but it's a possibility. I thought the only wiring for the WB went directly to the sensor in the exhaust, but I could be wrong. Do most WB's need a connection to the ECU?


What this all boils down to is I need to put in my stock ECU, but I'm unsure I can do that safely if the wires coming from the modified ECU are necessary for the car to run properly. From what I can tell I can't transfer the wires to the stock ECU. I was thinking about just putting in the stock ECU and seeing if the car runs, but I'm not completely sure this would rule out the wires as essential to safe operation.

Thoughts?

BTW- When I tried to do the swap, I disconnected the battery. Now my subwoofer doesn't work

 

I would go with the nitrous switch, call JWT...

 

Fire Hazard.

 

Call JWT. One would think that'd be the first thing to do.

 

to nismology

It be interesting to pop the top and comapare it w/a stock unit.

 

I said it first

 

404 ERROR, subtle reference to use common sense not found. Ex.

 

I already called JWT, but the techs were at lunch and I couldn't call them back. I'll call them tomorrow...

 

Red and blue wires plug into the n2o relay which activates the n2o solenoid. The grey wire is the arming switch for the n2o.

 

Thank you sir, that's exactly what JWT said.