O2 not cycling properly in DSMlink V3

packinkimber45 · Dec 10, 2010

I was just going through my logs and posted one on dsmlinkforums too. Someone had mentioned on the forums and I also noticed it. My O2 signal in link is not cycling from .20-.80 as it should be. Instead it is goin .20, .80, .20, .80 and so on. What is going on. I have a new LC-1 wideband that was recently installed and a new sensor with it. I am simulating narrowband via link as well. It is a new motor that I just got done building and got started. Initially my original oem narrowband sensor appeared to be dead when the car first started, so I installed my lc1. What is going on, can I get some direction here, what do I need to do or check. Thanks.

TylerAWD · Dec 10, 2010

i had a simmler probelem with my o2 but it was not a v3 for some reason my o2 reading were messed up but later i found out i didnt have enough grounds on my engine i guess there is a stock ground for the stock exhaust and when you get a aftermarket exhaust they never hook it back on fixed my problem also my car was not running right either

packinkimber45 · Dec 10, 2010

TylerAWD said:
i had a simmler probelem with my o2 but it was not a v3 for some reason my o2 reading were messed up but later i found out i didnt have enough grounds on my engine i guess there is a stock ground for the stock exhaust and when you get a aftermarket exhaust they never hook it back on fixed my problem also my car was not running right either

As a matter of fact I have an aftermarket exhaust too that doesnt have the ground hooked back up. Can you tell me what you did to get that ground back in place? I dont have a spot on my exhaust to use that same ground wire... Thanks.

twdorris · Dec 10, 2010

packinkimber45 said:
Instead it is goin .20, .80, .20, .80 and so on.

That's exactly how narrowband simulation in ECMLink works. The factory ECU code doesn't care about any O2 values other than 0.5v (well, the 2G ECU trims that a little bit based on rear O2 feedback, but 0.5v is pretty much it). So any value greater than 0.5 is rich and any value less than 0.5 is lean. That's all it cares about.

We chose to switch between 0.2 and 0.8 because that's far enough away from the 0.5 center point so as not to run into issues with the 2G's O2 voltage trim function and so as to clearly indicate a rich/lean value.

Thomas Dorris

packinkimber45 · Dec 10, 2010

twdorris said:
That's exactly how narrowband simulation in ECMLink works. The factory ECU code doesn't care about any O2 values other than 0.5v (well, the 2G ECU trims that a little bit based on rear O2 feedback, but 0.5v is pretty much it). So any value greater than 0.5 is rich and any value less than 0.5 is lean. That's all it cares about.

We chose to switch between 0.2 and 0.8 because that's far enough away from the 0.5 center point so as not to run into issues with the 2G's O2 voltage trim function and so as to clearly indicate a rich/lean value.

Thomas Dorris

Ok sounds good Thomas! I posted a log on link and two members posted on there about my o2 readings looking funny and I though that as well, but now it makes sense! Thank you.

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O2 not cycling properly in DSMlink V3

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