66ImpalaLT1

I made a cable to connect my LM-1 to the B1S2 O2 Connector, the other side is capped off. I connected output 1 from the LM-1 to the purple wire for that O2.

In EFILive I'm seeing .444 V on both B1S2 and B2S2, this isnt right because B2S2 isnt even connected.

I have the rear O2 codes disabled with Type X in LS1Edit. Perhaps this is what causes it to show up at 444 mV in EFILive?

Has anyone else attempted to do this, what am I doing wrong?

JNorris

iTrader: (4)

Below is a link to how I did it.

https://ls1tech.com/forums/pcm-diagnostics-tuning/137303-how-i-used-efilive-capture-lm-1-wide-band-o2-data.html

John

66ImpalaLT1

Thanks for your reply. I really want to make this work on a rear O2 input because they would not otherwise be used.

Debian Dog

Yeah I read that doc too and I do not want to go though my AC to do it either. I would think it would be "about" the same though. A guy in my car club is currently using the rear O2. I will ask him about it next Wed.

wrencher

iTrader: (2)

The PCM sends each O2 a "bias" voltage for operation, at about 400 millivolts.

critter

iTrader: (9)

66Impala - did you ever get this to work?

TT_Vert

iTrader: (12)

id like to know too

Dave

deezel

I have been slowly working on trying this as well. I havent actually wired the LM-1 into the O2 harness yet...

But I think I can answer about the codes being turned off. In preparation for trying to use B1S2 I turned off all the B1S2 codes. I can still record the voltage from B1S2 and it tracks with B2S2 more or less.

Anyone have any more tips about getting the LM-1 signal in thru the rear O2s?

Justin98TransAm

iTrader: (2)

My understanding is the A/C sensor is a 0-5 volt sensor, but the O2's are 0-1 volt. so you'd have to find a way to reduce the voltage of the output of the LM-1 to a 0-1 vold scale, then use your logging software to compinsate for the readings.

HumpinSS

iTrader: (1)

The WB output is 0-5v and that is why the AC sender is ued

Justin98TransAm

iTrader: (2)

yeah that's what I was saying, but he asked if you could use the B2S1 reading, I don't think it would be impossible but would need some monifications.