I have recently purchased and installed a PLX M-300 series wide band controller. I have decided to not use my stock narrow band O2 and replace it totally with the wide band O2. Now, I went to PLX website to see how is this done, and followed the directions as best as I could, but, still running into problems with a CEL code (Engine light) “Code 1” which is the O2 signal. I own a 96 Honda Civic HB DX with a B18c swap w/ a chipped P28 ECU. I have not ran into this problem before I put in the wide band controller. I have also attached a picture diagram on how it is currently wired up to my car, could someone who had experience with this, please double check it to see if I have done it correctly. Thanks, any info and feedback would be greatly appreciated. ECU pinouts would help aswell.

 

I thought you had to have a programmable ECU (such as Hondata) in order for it to understand the wideband o2 sensor signal.

 

Bump, is this true?

 

no DO NOT hook up the wideband out put to your ECU

PLX has an out put thats narrow band that you hook up to the ecu so it will see a signal.

it might be throwing a code because of the O2 sensor heater ( the sensors not hooked up so its not able to heat anything)

good luck and PLX has a forum which helps alot ( i dont know it anymore but its on there site, I have a plx R-500)

 

I'm not sure what tuning software you are running, but you have to hook up the narrow band signal to the ECU and disable the O2 heater in your tunning software. This should eliminate the CEL.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Buzzbomb &raquo;</TD></TR><TR><TD CLASS="quote">I'm not sure what tuning software you are running, but you have to hook up the narrow band signal to the ECU and disable the O2 heater in your tunning software. This should eliminate the CEL.</TD></TR></TABLE>


Do this.^

Also, you probably did this, but completely disconnect your stock o2 as well.

 

I also just noticed how you have your noise filters hooked up. Compare what you have to the diagram provided by PLX. They don't match. I don't think this is the cause of the CEL, but it may give you inaccurate readings.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Buzzbomb &raquo;</TD></TR><TR><TD CLASS="quote"> I don't think this is the cause of the CEL, but it may give you inaccurate readings.


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yup they filter electronic noise = accurate reading