Wideband O2 Sensor working with s300...

bmarshall8 · Post by **bmarshall8** » Mon Mar 12, 2007 5:23 pm

Hi! Let me start with expressing my appreciation for Hondata technology and thier efforts to explain everything there is to know about fine tuning Honda ECUs!

I have a '94 GSR, P72 ECU with the s300.

I have read all of the literature on the Hondata site, but don't feel confident that I have found the understanding i need to answer the following questions I have...

(1.) Is it's possible to REPLACE my OEM O2 sensor with a WIDEBAND 02 sensor if i'm running an s300?
(2.) If so, how is it wired to the ECU/s300 if there are more wires than the OEM sensor?
(3.) Can I ALSO piggy back a wideband gauge off the same Wideband O2 sensor even if it's going to the ECU/s300? (will the gauge controller interfer with the accuracy of the 02 sensor's output to the ECU?)

Thanks a ton in advance for your time to help me out. The more detailed information the better- I'm a sponge, and love the info...

Post by **Hondata** » Mon Mar 12, 2007 10:29 pm

This is what you need:

Look at the PLX M300: http://www.plxdevices.com/M-Series_productinfo.htm

The M300 has a display. The M300 has a narrowband analog output, which you feed into the ECU o2 sensor input to replace the stock o2 sensor. The M300 also has a wideband analog output, which you can wire into the ECU ELD input for datalogging.

If you want more bling then look at the R300 http://www.plxdevices.com/products_R-Se ... ollers.htm or the LED displays http://www.plxdevices.com/products_DM5AFR.htm or the iMFD.

bmarshall8 · Post by **bmarshall8** » Tue Mar 13, 2007 12:56 am

Thank you for the quick reply!

The PLX M-300 looks like a great solution. It is inexpensive compared to other Wideband Controllers and gauges. Is it a high quality product that is reliable?

While looking at the Hondata Tech page: http://www.hondata.com/techplxwiring.html

I don't fully understand Method #1. It mentions that the PLX has a voltage outpout of 0-5V for BOTH the narrow and wideband. That doesn't make sense to me- in fact the PLX website says that the Narrow band output is 0-1V...

Another thing I don't understand: Here's a quote:
"White 0-5V Output from wideband - connect to ELD input making sure that the ELD is no longer connected to it (ELD is pin D10 on an OBD1 ECU)"
I don't understand: Connect the White 0-5V Output from Wideband- and connect it to the ELD input making sure that the ELD is no longer connected to WHAT?

I'm confused- can someone please explain this to me?

Thanks again for all of your help!

Post by **Spunkster** » Tue Mar 13, 2007 11:14 am

the narrowband has been corrected to say 0-1v.

The ELD wire can no longer be connected to the ELD.

bmarshall8 · Post by **bmarshall8** » Tue Mar 13, 2007 12:04 pm

Thank you for the correction.

So, are you saying that for Method #1, ECU Pin# D10 should be directly connected to the grey wire on the PLX, and the original ELD wire that went to Pin D10 is left hanging...?

What exactly is the ELD wire that is left hanging? Are there any side effects of the ELD being disconnected?

Thanks again. This helps me tremendously!

Post by **Spunkster** » Tue Mar 13, 2007 3:13 pm

You must input the wideband signal in to the ELD input on the ecu. THe wire that went to the ELD can no longer be connected.

bmarshall8 · Post by **bmarshall8** » Fri Mar 16, 2007 7:52 pm

Thanks a lot for your answers. I'll be getting the PLX as recommended. Much appreciated...

sintegra · Post by **sintegra** » Wed May 23, 2007 8:27 am

almost just what i was looking for. but i have a s300 with obd2b plug in the ecu and obd2a -> converison harness.
where can i find the ELD pin?

Post by **Spunkster** » Wed May 23, 2007 10:01 am

I believe it is A30

sintegra · Post by **sintegra** » Thu May 24, 2007 3:29 am

what function does the ELD really have? is it safe to disable it, and use the pin for WB signal?

yes it seems like A30 is the right pin

Post by **Spunkster** » Tue May 29, 2007 10:15 am

ELD is not needed and can be safely disabled.

camshaft · Post by **camshaft** » Mon Oct 29, 2007 1:02 pm

my question is a long the same lines

What is the difference between the M300 and the SM-AFR

The SM-AFR doesn't have a front digital display ?
And is that the only difference ?

As I was thinking of getting the SM-AFR and dm-5 it is slightly cheaper

Any feedback on that ?

thanks

Post by **Spunkster** » Mon Nov 05, 2007 11:35 am

electronically they all function the same. If you want details on how the products differ I would suggest contacting PLX Devices.

camshaft · Post by **camshaft** » Thu Nov 08, 2007 9:04 pm

I did contact them and they are the same units..

Except for the obvious the M300 has a front display and the SM-AFR does not.
Beyond that PLX said they are exactly the same

Spunkster wrote:electronically they all function the same. If you want details on how the products differ I would suggest contacting PLX Devices.