Wideband o2 sensor on 2003 pathfinder vq35de

[Shalvaf]

Hello. I am going to install wideband O2 sensor ntk lza07-hd3, it has five cable 6pin on bank 1. Anyone have done this before especially without controller? All ideas will be welcome. I can't attach pics, says it is too large to link to images.

[mdmellott]

A wideband/air-fuel sensor performs the same function as a regular O2 sensor but the two operate in completely different electrical modes and are not interchangeable. The O2 sensors in a '03 Pathfinder are all regular O2 sensors. The hardware and software in the '03 Pathfinder ECM cannot function to adjust fuel trim by receiving signals from a A/F sensor.

[Shalvaf]

operate in completely different electrical modes and are not interchangeable

what is differences?

[VStar650CL]

The functional behavior is completely different. A/F's have a "center" voltage around 2V and give a pretty much instantaneous rich/lean indication, which is why they're typically used at the front for mixture control. HO2S's have no set "center" and are manipulated temporally by the ECM to analyze catalyst efficiency, the ECM makes slight rich/lean adjustments on a cyclic basis and watches both the voltage swing and response time of the sensor. Thus, the firmware algorithms to drive HO2S's are very different (and much more complicated) than the the firmware for A/F's.

[mdmellott]

This is a great subject topic for discussion to learn more about the differences between O2 sensors and A/F sensors and to get an understanding of their function regarding fuel trim. The most excellent resource I have found to learn about this subject matter comes from a microbiologist, Matt Bernstein, who has a YouTube channel called Schrodinger's Box. He has a 2 part video series that explains more detail about these sensor differences than I ever thought possible to completely understand.
https://www.youtube.com/watch?v=XQYDwIW ... dingersBox
https://www.youtube.com/watch?v=K8GLH6u ... dingersBox

To better understand the function of these O2 and A/F sensors, a firm grasp on their relationship to fuel trim is needed. In another 2 part series, Matt explains this as well, and in more detail than you may have ever wanted to know. All of these videos are quite long but they are very educational.
https://www.youtube.com/watch?v=5WnM_Ns ... dingersBox
https://www.youtube.com/watch?v=cARQ0jZ ... dingersBox

[VStar650CL]

The most excellent resource I have found to learn about this subject matter comes from a microbiologist, Matt Bernstein, who has a YouTube channel called Schrodinger's Box.

Looks very cool, I'll watch the whole bunch when I have more time. I just hope the box doesn't contain an un-dead quantum cat!

[Shalvaf]

The functional behavior is completely different. A/F's have a "center" voltage around 2V and give a pretty much instantaneous rich/lean indication, which is why they're typically used at the front for mixture control. HO2S's have no set "center" and are manipulated temporally by the ECM to analyze catalyst efficiency, the ECM makes slight rich/lean adjustments on a cyclic basis and watches both the voltage swing and response time of the sensor. Thus, the firmware algorithms to drive HO2S's are very different (and much more complicated) than the the firmware for A/F's.

i understand what you saying but here is the thing i am not trying to use wideband fancy possibilities lets say i want to remove that functions and let ECM use it as A/F sensor because wideban also has what A/F has heater-, heater+, sensor signal, and groun

[VStar650CL]

i understand what you saying but here is the thing i am not trying to use wideband fancy possibilities lets say i want to remove that functions and let ECM use it as A/F sensor because wideban also has what A/F has heater-, heater+, sensor signal, and groun

They all have heaters. That doesn't mean the stock ECM will have the slightest idea what to do with the signal. You simply can't do it without changing the ECM firmware. Not possible, won't work, don't go there. Look into a tuner if you want to do it, because that's the only way.