tpi_roc

I was hoping to clear up some relationships between tables in the '165. I've never even attempted to "hack" an ecm, and I dont know whats left in the '165 to be discovered, or what has been discovered that winbin doesn't support or otherwise.

With what IS out there in the open with the '165 things seem to contridict themselves quite a bit. Like closed loop? Once you're in closed loop your 02 sensor is part of the game, however if its a "switching" 02 the information it gives is rather useless, or at least very minimal, and still the air/fuel delivery is largely based off of the LV8 vs rpm tables etc...

what IS the roll of the 02, is there a way to make the '165 more dependant on it? How does it relate to LV8, RPM's, and BLM's.

are BLMs adjusted by the 02's reading? or by LV8? Higher 02 voltage is richer which is lower BLMs so maybe an experienced person has all these relationships panned out and can steer this in the right direction.

hectorsn

I think you need to trully understand the operation of the O2. When in closed loop, the O2 <b>IS</b> the game, not part of it. It's information isn't useless although it isn't accurate away from stoich. The ecm checks the O2 many times a second and every time it checks it, it wants it to be on the other side the next time. If lean this time, then it wants rich the next time. This way an average is established so by switching it, it is accurate at stoich. Now what the ecm does is start checking it as soon as it goes to closed loop. Let's say for arguments sake it is the first time the ecm has run. The first thing it does is check whether rich or lean and use the load/rpm value and give it that much fuel. Then again checks to see whether rich or lean and adds or subtracts to the load/rpm value. We're talking usec to the msec you see on a scanner. If the next time it checks the value is still the same, then it adds more fuel or less fuel and keeps on doing this until it switches to the other side. Then it's back at it, to make it go the other way. These changes show up in the BLM, INT numbers when they go too far one way or another. Simplistic and maybe not totally accurate information but I think it's a pretty good explanation of how it works. So basically, yes, the BLM's are adjusted by the O2 values.

tpi_roc

Why do i get 02 readings where the mv is 300 and the blms are 128 in closed loop?


Thats one of the contridictions that I've found.. things that just dont seem to add up.

tpi_roc

Ok wtf...

ON closer investigation it looks like my blms are switching back and forth across 400mv on the 02???


I thought 14.7:1 was somewhere around 900?

mv cell blm int fine (all closed loop)
420 14 128 128 128
415 14 128 128 128
442 14 128 128 128
473 14 128 128 128
491 14 128 128 131
530 14 128 128 125
667 10 128 128 128
888 10 128 128 126

Matt87GTA

There-in lies your problem.... 14.7 = 450 mv on our switching O2s.

tpi_roc

Well son of a ......


I've heard 900 in more than one place though...

wel cool then im not so far off

Matt87GTA

Nope, you look like you are really close to me. If you are getting all kinds of 128s and the O2 switches across the 400 to 450 mv area, you are right on. Nice work!