LC1 wiring, which analog output to the MSII?

allen22 · Post by **allen22** » Tue Aug 15, 2006 11:43 am

Hello,
Finishing up my LC1 install, just wondering which analog output should I wire into the MSII V3's 02 sensor input pin? I figure output #1 but just checking.

Thanks
Fred

S.Bretz · Post by **S.Bretz** » Tue Aug 15, 2006 3:27 pm

I used the channel 2...the first channel is pre-programed for a narrow band 0-1v signal, the 2nd is preprogrammed for a wideband 0-5v siganl

allen22 · Post by **allen22** » Tue Aug 15, 2006 6:08 pm

Gotcha, so you used the brown wire, analog output 2 to connect to your megasquirt.

Thanks!
Fred

S.Bretz · Post by **S.Bretz** » Tue Aug 15, 2006 6:17 pm

Don't remember the color, I remember that output 2 was the WB signal.

There should be an instuction sheet somewher in the box...there is also a quick refernce page. I think the ref page has that info if you want to double check it.

PJF · Post by **PJF** » Wed Aug 16, 2006 4:39 am

I just did this myself. On page 10 of the LC-1 .pdf manual it states that output 2 (brown wire) is factory preset to output 1 to 2 volts so I foolishly assumed that output one (yellow wire) was preset to be 0 to 5 volts. Well it didn't work when I wired it up.

I simply used LM Programmer to reprogram the output to 0 to 5 volts and bingo! All is well in MT and on my MegaView.

Good luck.

By the way did you do the 470 Ohm resistor mod on your LC-1 output to MS? The general concensus seems to be put it in just in case to save damaging your LC-1. I did it and the sensor seems to work fine. Just a thought.

allen22 · Post by **allen22** » Wed Aug 16, 2006 5:10 am

Hmm, I don't see anything about it on page 10 but on page 14 it says this:

As factory programmed the first output simulates a typical narrow band oxygen sensor. The
second output is programmed to output between 0 V for an AFR of 7.35 (gasoline) and 5.0V for
an AFR of 22.39. Other curves of course are easily programmable

This would indicate that I should use output 2 since it's already set up for 0-5V operation, right?

But it sounds like it's easy to reset it so I probably could use either output and use LMProgrammer to reset like you did?

I don't have the 470 Ohm resistor, don't know much about that. Is it mentioned in the LC1 manual?

thanks
Fred

PJF · Post by **PJF** » Wed Aug 16, 2006 7:41 am

Well that's bizarre. We apparently have two different manuals for the same piece of equipment! My page 14 is "Advanced Output Programming" Strange.

On the resistor issue I should have linked you to the thread here at msefi.com The information is not in the LC-1 manual but has been discussed here and also at innovatemotorsports.com

http://www.msefi.com/viewtopic.php?t=16515

I got my resistors at Radio Shack, part # 271-1115. Package of 5 for $1.00