O2 gauge reading and O2 s300 values not the same?

s300 and SManager software questions & answers
Post Reply
Corksil
Posts: 10
Joined: Wed Aug 01, 2012 4:26 pm

O2 gauge reading and O2 s300 values not the same?

Post by Corksil »

I have an MTX-L gauge, with it's YEL (0-5v) output linked to D14 (o2 signal input.)

I set the range of the o2 from 0-1.5v (default) to 0-5v in 'Options>Sensors'

The reading on the gauge in the dashboard seems pretty close around idle (~13.5) but when I accelerate the dashboard gauge reads ~15 and the value in s300 reads ~14.8

The higher the dashboard gauge goes, the more of a difference between it and the s300 o2 value. (When dash reads ~18.5, the o2 value in s300 reads ~17.8)

On a side note - the o2 value in s300 never goes above 18.99 even when I have 0% throttle (coasting) and my dash gauge goes up to 20.4

Can anyone tell me what the problem is? Thank you in advance for helping.
Johnny_9
Posts: 312
Joined: Sun Apr 09, 2006 5:12 am

Re: O2 gauge reading and O2 s300 values not the same?

Post by Johnny_9 »

need to check your electrical grounds...(goto innovate website)
User avatar
Spunkster
Site Admin
Posts: 22745
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata

Re: O2 gauge reading and O2 s300 values not the same?

Post by Spunkster »

Use a different input. The stock o2 input is not capable of reading the entire voltage range. Try ELD instead.
portenio78
Posts: 38
Joined: Mon Oct 24, 2011 6:43 am

Re: O2 gauge reading and O2 s300 values not the same?

Post by portenio78 »

Play with the voltage offset. Mine is at 0.02
Corksil
Posts: 10
Joined: Wed Aug 01, 2012 4:26 pm

Re: O2 gauge reading and O2 s300 values not the same?

Post by Corksil »

I was going to play with the voltage offset, but the two readings seem to be offset at different intervals.

At 14:1, everything is on point and the two inputs match. The higher the gauge reading climbs, the more the s300 input reading lags behind. Vice-versa for lowering the numbers.

Gauge | s300 reading
14:1 = 14:1
14.5 = 14.3
14.7 = 14.5
15 = 14.8
16 = 15.6
17 = 16.5
18 = 17
19 = 17.5
20 = 18

I don't think voltage offset is the problem. Am I correct in saying that the voltage offset would offset the voltage EQUALLY all the way from 14 up to 20? My numbers are not proportional.
User avatar
Spunkster
Site Admin
Posts: 22745
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata

Re: O2 gauge reading and O2 s300 values not the same?

Post by Spunkster »

Have you tried a different input?
HondaTechn303
Posts: 26
Joined: Thu Apr 09, 2009 7:35 pm
Location: Longmont, Co
Contact:

Re: O2 gauge reading and O2 s300 values not the same?

Post by HondaTechn303 »

I too have an MTX-L Innovate Motorsports Widebad Sensor.. My question is why would you hook up the Yel wire in the O2 pin??? I have the Yel wire hooked up in D10.. Now the Brown wire simulates the narrow band sensor, I have that wire (Brown) hooked up in the O2 pin.. How about we install it correct, then get back here when its correct..
Corksil
Posts: 10
Joined: Wed Aug 01, 2012 4:26 pm

Re: O2 gauge reading and O2 s300 values not the same?

Post by Corksil »

Yellow gauge output wideband signal (0-5v) wire is hooked to D14 (o2 input).

The brown wire (simulated narrowband) is not hooked up.

Pin D10 you mentioned is ELD, and requires cutting resistors 136/138 which I would rather not do unless I must. Scared of damaging the ECU. I was told I should be able to use D14 with the 0-5v yellow wire and it appears to be working.

I added more grounds and made sure there was nothing wrong and the numbers seem much closer now between s300 and the gauge.

What is the preferred method of verifying the two AFR numbers between s300 and the gauge?

I'm holding my laptop next to the gauge in the dashboard while datalogging and I can't be sure the numbers match because they are jumping around very much (+/-0.3 at idle, damn near impossible to compare them when the RPM starts climbing.

Thank you.
Corksil
Posts: 10
Joined: Wed Aug 01, 2012 4:26 pm

Re: O2 gauge reading and O2 s300 values not the same?

Post by Corksil »

I cleaned all grounds and added a few more to be safe. The ECU and gauge also share a common ground in addition to their individual grounds.

I have my voltage offset at -0.06v for what it's worth..

Please have a look at this video I made of the gauge/datalog side by side. It's hard to tell but if you scrub through frame by frame they are pretty close. There's a slight delay (I think the gauge is a little quicker than the s300 reading.)

Are the readings close enough to move forward and start working with a tuner?

Thank you.

http://youtu.be/CZS4mrWrheI
User avatar
Spunkster
Site Admin
Posts: 22745
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata

Re: O2 gauge reading and O2 s300 values not the same?

Post by Spunkster »

Turn the key to the on position withour running the engine and you can easily see if the AF matches.
Corksil
Posts: 10
Joined: Wed Aug 01, 2012 4:26 pm

Re: O2 gauge reading and O2 s300 values not the same?

Post by Corksil »

Spunkster wrote:Turn the key to the on position withour running the engine and you can easily see if the AF matches.
Not quite that simple.

The gauge reads 19.2 approximately when the car is off. Hondata AFR reading maximum appears to be 18.89 because when I coast and the car goes full rich (22.9 on gauge) the Hondata AFR only reaches as high as 18.89.

Any other ideas?
User avatar
Spunkster
Site Admin
Posts: 22745
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata

Re: O2 gauge reading and O2 s300 values not the same?

Post by Spunkster »

What input are you using?
Post Reply