WB/NB voltages are off - Resolved

peasly23 · Post by **peasly23** » Tue Oct 23, 2007 7:08 pm

I started with a Stock p28 basemap.
I have a 95 Honda Civic (D16Z6)
RC 750cc injectors
Walbro 255

What is going on between 33 seconds and 1:15 in my first datalog?

Look at S.Trim, AF, and O2 Voltage at idle.

I have the S.Trim set at -25 and it seems as though it started maxing out during idle while my A/F ratio started to go up to 16.9. wtf?

My target voltage is set to .51 volts and my target A/F is set to 14.7 under low load (under 10" vacuum). Maximum map for closed loop is also set to 10" vacuum.

The second datalog is where I set the minimum and maximum S.Trim to 0.

Post by **Spunkster** » Wed Oct 24, 2007 5:05 pm

The problem is you are trying to run the car in closed loop using a innovative wideband. The voltages you are inputing to the ecu are wrong. It is seeing 1 volt and thinking it is running rich, and taking more and more fuel out.

peasly23 · Post by **peasly23** » Wed Oct 24, 2007 5:26 pm

Ok, first I want to say thank you for looking at this for me I greatly appreciate it because this car is my baby and I don't want to ruin it. And second I want to say that I understand what you are saying.

So here's where I'm confused... My Innovate inputs a narrowband signal to the ecu where the stock O2 voltage wire used to be (D14 on the ECU). The narrowband output is EXACTLY like the narrowband output you have showed me before. Specifically the voltages I am inputing are 1V = 14 AFR & 0V = 15.4 AFR, which makes stoich = .50V

So, when I am in closed loop, isn't my S300 reading from D14, and not from my wideband signal on D12? Is there something wrong with these specific voltages that makes it think it's running rich even though my wideband says 16 AFR and higher?

I have been street tuning in closed loop with the S.Trim set to Zero and my Guage is reading DEAD on my target AFR. Is there something wrong with my wiring? I checked it sooo many times though. :(

Thanks again.

peasly23 · Post by **peasly23** » Wed Oct 24, 2007 5:56 pm

Let's put a specific example here so that I may more clearly understand what is going on.

Using the datalog that is marked "735pm Changed Strim to +-25pct" At EXACTLY 0:1:06.707s my AF ratio is 16.99 (Lean) and my O2 voltage is .14V (which, according to my voltages entered above, would be Lean as well). So then why is it that the S300 is trying to PULL OUT FUEL to make it even more lean by changing the S.Trim to -22%? This doesn't make sense to me.

peasly23 · Post by **peasly23** » Wed Oct 24, 2007 6:11 pm

The only explanation I can figure, is that although I set the Narrowband signal to 1V = 14 AFR and 0V = 15.4 AFR, it's not actually outputting that. And if that's correct, what in the world would cause it to be wrong?

Post by **Spunkster** » Thu Oct 25, 2007 12:13 pm

This is why we only recommend the PLX.

peasly23 · Post by **peasly23** » Thu Oct 25, 2007 12:53 pm

I think I finally figured out my problem.

But before I tell you what I think it was, I just wanted to say that it's not very helpful to keep saying all the time "this is why we only recommend the PLX."

I know, I know, but not EVERYONE HAS the PLX. The concepts are the same, so a little bit of help so that others can figure out why there's isn't working would go a long way. You know I can't exactly unwire everything and spend the money replacing what I've done with a competely different system. I made three posts above and you didn't try helping with any of them.. all you said was "this is why we only recommend the PLX" I GET IT ALREADY!

Now, on with what I think I found as the problem. There was a huge voltage offset problem of -.63V that took me a while to figure out. But once I set it to be that, the O2 voltage and A/F started to work better. I have now re-tuned it and it seems to be running MUCH better.

Attached is a current datalog. Does this look more normal or is my O2 voltage still off?

peasly23 · Post by **peasly23** » Sat Nov 03, 2007 9:05 pm

I THINK I FOUND THE REAL ANSWER to why I was getting such a huge voltage offset... I traced all my wires and found out that my ELD was OUTPUTTING 4.53V. What the crap??? Then I looked at Hondata's help file and found this little ditty...

Smanager Help File wrote:Note that if the ELD input (D10) is used then R136 and R138 (US ECUs) may need to be removed.

I contacted Phearable.net and they confirmed that they didn't remove whatever this is and that was causing my problem.

I have since changed my Wideband input from Pin D10 ELD, to my Analog Input 1 on Pin D12. Now everything matches up fine and NO MORE VOLTAGE OFFSET!!!! YAY!!!