PLX wideband linear output will not drop to 0 volts

[DJ23GSX]

Long story short I can't get my PLX M300 to datalog accurately with ECMLink V3. I tried setting it up as default PLX in the link drop down box and also tried to calibrate it as a linear output and neither will log accurately. The one constant problem I've noticed is the output volts when datalogged in link will not go down to zero (.61v) even though the wideband display is showing full rich with a gas soaked rag wrapped around the sensor. It does this with the old sensor and also with the brand new sensor I just bought. I have it wired into the EGR pin with no buffer or noise filters. Could this be a wiring issue or is the unit itself defective?

 

[ErikTande]

I had a similar issue. I had my PLX wideband hooked up to the EGR (ECU Pin 15), but I soon realized it wouldn't log the full range (it would never log in ECMLink below 11 afr, even if the gauge itself was reading 10).

To remedy this, I wired the wideband into the Front O2 (ECU Pin 4) and enabled the narrowband simulation. Now my wideband is reading correctly in ECMLink.

 

[DJ23GSX]

That is most likely my next step. How is your narrowband simulation? The only reason I haven't tried this yet is I've read that the PLX narrowband simulation is really slow and can cause closed loop drive ability issues.

 

[ErikTande]

It's good now. It was tricky to dial in, but this post really helped me: http://www.dsmtuners.com/threads/worth-it-to-switch-02-sensor-for-wideband.451024/#post-153131397

I also ended up moving my wideband up to the front O2 spot since it wasn't getting used anyway, that helped the narrowband simulation a TON.

 

[DJ23GSX]

Do you have any issues with burning out sensors running it that close to the turbo?

 

[ErikTande]

Nope, no issues. I also made a copper heatsink for it though, I saw a lot of places (including ecmlink) recommending that.
http://www.ecmtuning.com/wiki/innovatelc1orlm1install

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[DJ23GSX]

Ah thats clever. I've seen those heatshields before. Last question when you simulate the narrowband using link and the front o2 sensor input do I still wire the 5v output of the wideband controller to that input or do I need to wire in the narrowband 0-1v output from the wideband?

 

[ErikTande]

Here's the copper sheet(s) I ordered in case you're interested. They're the perfect size. http://amzn.to/1s12r4s

Wire the 5v output of the wideband to the front o2 pin on the ecu (pin 4 on 1g). Enable narrowband simulation in link, then set the switch point to 2.35 according to this:

http://www.ecmtuning.com/wiki/v3narrowbandsim

 

[DJ23GSX]

Ok so I wired my wideband to the front o2 pin 4 on the ecu and assigned the pin in ecmlink and then added it to the capture/displayed values and it only reads full rich and does not move at all. The raw front o2 volts are also locked at .04 volts even though I tested 2.35v with a multimeter coming from the 5v line (wired to pin4) of the wideband. I can't imagine why this is happening other than me missing another setting in link to get this logging.