Wrong AFR

[Serone]

I have a ms2 v3 with lc1 wide band O2 sensor installed. In TS AFR is always 12 or 16.8 and in the same time exhaust oxygen voltage displayed by TS is correct lc1 voltage just does not get converted in AFR correctly. I have made all settings to wide band. I have made a new project but copied settings from ms, nothing works. I am running latest firmware 3.31. The same TS and lc1 work on different car with ms3.
Is it possible that because the project was created first with narrow band sensor it hasn't change my selection to wide band?

[LT401Vette]

It sounds like you have not calibrated the AFR from under the Tools menu. The MegaSquirt is still calibrated as a Narrowband.

On the main menu select:
Tools --> Calibrate AFR

Then in that dialog select the proper LC1 setting and "Write to Controller"

[Serone]

I did calibrated the AFR in tools menu multiple times. But when I press write to controller some times it does not write the first time but second or third time works.
Can it be something wrong with the v3 board? I think not because the ms2 gets the voltage from lc1 that is why is displayed by ts no?

[LT401Vette]

What version of TunerStudio are you running?

[Serone]

The TS version is older (2.0.3) I think but it is working fine on other car with ms3 ecu.

[LT401Vette]

You can not use 2.0.x TunerStudio with MS2 Extra 3.3 firmware. MS2 Extra 3.3 added the new protocol and there were several additions made to TunerStudio to support it. It will cause problems, for 1 you can not calibrate your AFR or thermoster tables. 2.0.x will write the entire table at once, but with 3.3 firmware it needs to be written in chunks.

Please upgrade your TunerStudio.

[Serone]

Thank you very much.

[Supernova_6969]

I don't mean to resurrect, but I just hooked up my lc1 to my MSII, and i had a similar issue to what you had.

I read the LC1 manual a realized that the LC1 is programmed so that one of it's output wires outputs a wideband signal from I think 0 volts to 5 volts (reflecting 7 afr to 22 afr I think) and the other output wire is putting out a fake single band output; something like 2 volts for 14.7, and like 4 volts for other values. that's what most OEM O2 sensors use.

I had the wideband wire plugged into a digital readout in the car, leaving me with the other, single band that I could plug into the MSII, which is useless.
fortunately, the LC1 manual, that you can get on the innovate website, explains how to reprogram the LC1 O2 sensor so that you can have the two output wires putting out wideband signals (with an application also available on their site).

I did that and it worked. once you hook the wire into the MS ecu, all you need to do it tell it what signal it should expect, like the others suggested in the thread. be careful though, I told my MSII to use the normal LC! signal and I got weird values, so I have to basically tune the voltages by ear. So either my LC1 is not outputting what I told it to, or the MS2 is not reading it properly. I'm working at it (tweaking the MSII AFR calibration to custom voltages incrementally, and getting closer and closer to the real afr as shown by the digital gauge), but anyways it's something to keep in mind. in any case, if the reading is wrong, son't let the MS work in closed loop; It's now screwing my afr, I think, since the MSII is reading the wrong AFR.

by the way, I'm now unable to communicate with My MSII. see my thread if you think you can help with that.