JAW Wideband Wiring

[zombezoo]

Just purchased everything I need to setup the JAW Wideband kit.

I have some wiring questions. My plan is to replace the stock NB sensor with the bosch wideband unit, cut the wires and plug off an old factory NB sensor and use the power and ground from the factory harness to power the JAW unit. Then wire the factory O2 signal wire into the JAW simulated NB output. Does anyone know what power draw the factory wiring can handle? JAW documentation claims the unit draws 1.5 Amps at heat up and 1.25 Amps during operation. Can the factory harness handle this kind of draw? Factory sensor must draw something similar. I figure with this configuration I dont have to cut any of my factory harness or find a switched power source to power the unit. Thoughts anyone?
Thanks!
Ryan Lada

[zombezoo]

Anyone? Anyone?

Seems like the average O2 sensor draws 1.5 amps at startup (per the research I have done), which is right in line with what the JAW wideband draws. Unless someone knows differently, Im going to try it out and see.

[whywoody]

I can't help you with your question,sorry,but I am very interested to know how you like the kit etc. I have been looking at purchasing one,and I'm sure others on this board would like the DIY and price.

[zombezoo]

It will be about a month before I get it installed. Current engine burns too much oil to risk the $60 sensor. I hope to have a fresher engine installed in the next 3 weeks and JAW install to follow.

[rx2mazda]

Are you aware that a WB02 reads a different value of voltage than the stock NB? NB reads/sends to the computer a voltage between 0-1.0v a WB02 reads/sends up to 5v. Your computer won't recognize a reading like that from a WB02. The NB02 acts as a switch for the computer to read between stoich.

Leave the NB sensor alone and wire your WB with its own wires/ground. Unless you have a aftermarket computer that can read your WB02 signal.MY 2 cents.

[zombezoo]

JAW unit has an AUX output you can program to output a simulated NB (0-1v)signal. Thats what will replace the signal from the stock NB sensor. The original plan was to use the factory power wire, but Im not sure if its controlled by the PCM (PCM applies and removes voltage to the heating element based on sensor temp and reaction), or if its just a +12v switched source. If its a +12v switched source that turns on when the ignition is on, I can use that to either power the JAW unit, or power a relay that powers the JAW unit. It looking more and more like I will just have to find my own dedicated power sources. Not a big deal, it just would have been convneient to use the factory wiring for all my needs.

[Endo]

You need to mount your WB o2 sensor further down the pipe. The stock location is too hot. I put mine right at the end of the first bend, about 8 inches upstream of the cat. No problems.

[zombezoo]

Quote:

Originally Posted by Endo You need to mount your WB o2 sensor further down the pipe. The stock location is too hot. I put mine right at the end of the first bend, about 8 inches upstream of the cat. No problems.

I was worried about that, but was going to try it in the stock location to see how hot it got. I bet the stock location was picked when they were using the unheated 1 wire sensors and was just never changed after they switched to the 3 and 4 wire units. I wonder how the stock sensor life is affected by the factory location.