Rodimus_Prime

iTrader: (3)

Ok so I have a PLX wideband sensor that has of course the 5v signal and it also puts out the 900mv signal, I tried before on a cav using this as the single sensor, it kept throwing a heater circut failure and a slow response code

I was able to get rid of the heater circuit code by riggin up a resistor box but i continued to get the slow response code, has anyone been able to get away with doing this on a cobalt?

1fstss

the narrow band runs off of your regular o2sensor, a wideband has to run off of a seporate o2, i think it has to be at the 2oclock position.

Witt

Slow response would be from feeding a 0-4/5v back to the stock PCM instead of 0-1v I bet.

zomghax

Witt I have been meaning to PM you for awhile... Did you get the AEM hooked up to relay your narrowband back to the pcm? Did you use the primary o2 sensor location, or did you go after cat?

Rodimus_Prime

iTrader: (3)

no your not understanding, the wideband controller has 2 outputs the 5v signal and the narrow band, you run the 5v to a guage and you run the 1v to the stock pcm

nowhere did i say i was running the 5v into the stock pcm

Doc

use a 4ohm resistor.

Witt

No, I didn't, I would lose capability to data log unless I wired the serial output to an RS232 port, thats above my skill level.
Sorry, I thought you had an AEM, which only has one output. I know the code throws when an AEM output is connected to the PCM without first changing the switch on the back to output to 0-1v. If it helps any, the PCM will throw a slow response time code when the o2 sensor doesn't sweep from 650mV to 450mV and back within a preset amount of time, if that helps you diagnose anything. It could be a tuning issue as well.

Rodimus_Prime

iTrader: (3)

there is no need to switch on a plx both outputs are supposed to work at the same time

what would a 4ohm resistor be used for?

Doc

sometimes it helps to simulate the narrowband signal...slows it down

Rodimus_Prime

iTrader: (3)

INTERESTING, so would i just wire that in line with the 1v wire?

Doc

I know it works for the LC-1 so it should work for the PLX.

Johnboy12358

How do you wire it up to the PCM? splice and solder or is there a plug that you can just hook into? Just wondering because I think I would like to go this route, just putting one O2 in the exhaust track for simplicity sake

Witt

You still have to wire up a resistor for the heater circuit or you'll end up with an SES light. It's much easier to pay Meineke 20 bucks to weld an O2 boss in your exhaust before your cat.

jester

Thats what I just got done today at meineke. And by that I meant the O2 after the cat

Rodimus_Prime

iTrader: (3)

you do not put a wideband after the cat, that resolves nothing, it should be 18 inches from the head

I know how to cure the heater circut code with resistors that is not the issue

Witt

Are you still having problems? Put a multimeter on the wideband controller's output to see what it really is feeding back to the PCM, since the DTC you are getting is related to o2 feedback voltage.

I understand that your problem is not a heater circuit, someone posted above and asked if its easier to install a wideband in this fashion and I said it isn't because of the heater circuit, hence the quote in my post.

Rodimus_Prime

iTrader: (3)

its not actually on the car, the problems i got was trying to do the same thing on a cavalier ecotec, but the LSJ isnt all that much different than the L61, im just trying to avoid the same fate now

The narrowband output is working correctly as far as voltage on the multimeter