Scanner can't see AEM 30-300 but 30-310 reads just fine.

[kyotey1693]

I have a 30-310 that I used for a mobile WB. I recently installed a 30-300 into a different vehicle so it can have a permanent WB. I can see the 30-310 just fine but the channel disappears when I try to connect with the 30-300. I'm using the same DB9 to USB adapter. I've tried removing the channel and re-adding it. I've re-transformed it. I've got the blue wire going to pin 2 and the black going to 5. The gauge is working, I just don't see it in the scanner. What am I missing?

[kyotey1693]

Turns out this was a mistake on my part (I figured it was). I had changed the bezel and faceplate so that it would read Lambda and apparently I got the screws just a touch to tight which was causing the mode and select buttons to be constantly depressed. I loosened the screws, set it to lambda, and rebooted the scanner and now all is good.

[kyotey1693]

Ok so that only got me partially out of the woods.. The gauge reads super lean on it's display however it's near stoich on the output to the scanner. I can read afr or lambda on the scanner and it looks pretty close to the commanded the whole time. But the gauge reads 40-60% lean in afr or lambda. I switch between 3 or 4 digits on the gauge display but no change. Still super lean. What else am I missing?

[dr.mike]

The serial output of the gauge is wrong, when set to lambda display mode. i.e. it outputs 10.0 for lambda=1.0

So, divide by 10 to get the actual lambda value. This is a known issue. I think it was inherited from the old 30-4100/4110 gauges. And, kept to maintain compatibility.

The 30-0310 does not have display modes ( obviously ) . So, it does not have this issue.