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Old 08-27-2010, 12:51 AM   #1
FleaDog
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Member#: 96267
Join Date: Sep 2005
Chapter/Region: MAIC
Location: West Chester
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'06 20G-XT'd STI
CGM & NT03+M

Default PLX M300, etc: A wideband which also serves as a stock narrowband... - ? instal

I got a lightly used plx M300 for a steal and I am looking at the options of installing it. Of course the first is to get an extra O2 sensor bung welded onto my DP, but I was also looking at the option of replacing the stock narrowband, which is a method plx says is feasible.

So, to rephrase, that basically allows you to replace the stock narrowband with the wideband (plx) sensor but allows normal ECU narrowband closed-loop operation.

FYI, I am referring to an older m300 like this:



I will mount the display box in my forrestor DIN pocket below my radio.

Related:
M300 user guide:
http://www.plxdevices.com/Installati...UsersGuide.pdf

PLX instructions for stock narrowband sensor replacement & simulation with plx wideband:
http://www.plxdevices.com/AppNotes/PLXApp004.pdf
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Old 08-27-2010, 12:52 AM   #2
FleaDog
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'06 20G-XT'd STI
CGM & NT03+M

Default

Still making headway on figuring this out, but it looks fairly simple now that I've read it 100 times.

Here's a link to the instal on a honda s2000:

S2000 PLX Device M-400 M-500 Install - - Andrew's Website

I am going to use this as a guide, but with the exception of the proper connections on the STI ECU.

****AFAIK*** here's the pinout diagram for the 05 USDM STI which is the same as the 2006 USDM STI... I have yet to definetively confirm this though.

http://northursalia.com/modification...04_STi_ECU.pdf

Or:

http://svt4u2try.com/tmp/MSA5T0613A255122.pdf

Diagram:



Install notes added:


Instructions:

A. Replace the stock narrowband 02 sensor with the plx wideband o2 sensor.

B. Make 3 wire connections/splices from the PLX's wire harness to the ECU's wire harness:

(1) Connect/splice 12v+ (as close to ECU as possible)

(2) Connect/splice ground (as close to ECU as possible)

(3) ***Connect/splice narrowband input (which is the gray wire on the PLX harness) to the wire on the ECU wire harness which carries the normal narrowband input to the ECU (from the stock narrowband o2 sensor when it's normally there). This is how we are not only using the PLX for a wideband, but also letting it substitute for the stock narrowband.

C. Add a 20 ohm 10 watt resistor (Radio Shack part#271-132) in b/w the 02 heater power and 02 heater ground wires on the ECU harness. This fools the ECU into thinking that the stock factory 02 sensor's heater circuit still exists. Apparently this can get hot, so it needs to be mounted with that in mind.

D. *OPTIONAL PER YOUR NEEDS* Install the noise filtering capacitor (0.1uF 50V ceramic capacitor) across Chassis GND and O2 Signal Input as close as possible to the ECU. This eliminates unwanted electrical noise and increases close loop ECU performance. ***This capacitor is not illustrated in the PLX pdf instructions. It is described in more detail in the M300 installation instruction pdf.

Per PLX: Ignore this step if you only intend on using the M-200/M-250/M-300 as a stand alone system. If you plan to integrate the M-200/M-250/M-300 with stand alone engine management systems, piggy back systems, data loggers or any other devices that utilize the two analog outputs (white, gray wires), noise filtering capacitors must be installed near the application. The included capacitors filter out unwanted electrical noise produced from your vehicle’s ignition and other onboard systems. This provides added signal integrity for more accurate, reliable and consistent measurements. Any 0.1uF 50V ceramic capacitor will work.

I do not plan on adding these as I will not be using this to log

Since I think I have this down, I will be attempting to wire-it-up soon

Last edited by North Ursalia; 11-11-2013 at 01:51 PM. Reason: URL was wrong
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Old 08-27-2010, 12:53 AM   #3
FleaDog
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'06 20G-XT'd STI
CGM & NT03+M

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A email reply from PLX: "You shouldn’t have to use any resistors with the narrowband simulation. If you have the older M-300, simply connect the grey wire to the O2 signal pin on your ECU. If need be, you can connect a ground as well. If you have the newer M-300 TE, just connect the top right pin in the analog clip to the O2 sensor signal pin, ground is bottom left."
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Old 08-27-2010, 08:47 AM   #4
Mulder
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The factory 02/AF sensor in your STI is not a narrowband nor is it a conventional wideband. It is unlikely this unit can successfully be connected in its place. Attempting to do so will result in poor running and CEL's.
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Old 08-27-2010, 12:20 PM   #5
FleaDog
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'06 20G-XT'd STI
CGM & NT03+M

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Quote:
Originally Posted by Mulder View Post
The factory 02/AF sensor in your STI is not a narrowband nor is it a conventional wideband. It is unlikely this unit can successfully be connected in its place. Attempting to do so will result in poor running and CEL's.
Cool, anyone else have any other thoughts? First I have heard of the above - explain further?
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Old 08-27-2010, 03:45 PM   #6
Mulder
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02 WRX
15 WRX/05 GTO

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The OEM sensor is a semi-wideband and does not output either a 0-1V or 0-5V signal. It works on current not voltage. No other sensor will work in its place.
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