How to log afr via Aem Uego and evo scan?
 

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Whats up yall looking to log afr via a aem uego and evoscan 2.9.

Ive read a few threads on here but all are un conclusive also out dated.

Ive read about a serial to usb plug but the threads are from 2008.

Dont wana waste time or money if it aint gonna work.

I live near a frys so looking to build it with frys equipment. Or is there a better way to log afr now in 2017? Thanks.

What i have done --

Connect White wire from AEM UEGO to pin 73 or pin 75 of the ecu.

Start logging, ull see data populate - Adjust formula to match wideband with logged AFR.

Thanks mines5

I actually made a serial to usb adapter. Works well.

I just connected all the AEM wires to the rear O2 socket. Since the rear O2 is powered by the MPI circuit, the AEM doesnt reset while cranking which is a huge bonus. Not to mention wiring is a lot simpler since all the wires are at the same place. I did not want to snip the connector from rear O2 so just used pins for now.

Attachment 325045

I had to adjust the formula a but so that it read the same as AFR guage. Dont know why mine was so off.

Attachment 325488

I made the serial cable

Bringing this back, I like the idea of wiring into rear o2, but in evoscan, does the rear o2 then read as wideband? And you just change the name? Or what

The OEM O2 sensors are narrowband and cannot read AFR's like a wideband. Your best bet to logging AFR in Evoscan is to pick an an AEM UEGO Wideband gauge and use the RS232 output. You can use a RS232 to USB converter harness and access the data in evoscan by selecting which port the wideband is connected to. There are several options are available in Evoscan so make sure the baud rate is set to 9600. Also, you may want to have an O2 bunge welded on right before your downpipe exhaust hangers towards the cat instead of using the rear o2 port for more accurate measurements. According to AEM their o2 sensor is not supposed to be positioned all the way back there.

I’m aware of the placement, what I’m going to do is pin into the rear o2 output pin 73 on an evo 9 ecu. we do this on DSM’s using ecmlink, it reads a 0-5V. Were in 2019, aint no one using a serial cable lol

i think I see the wideband option for the rear o2 in evoscan. I’m only concerned with logging an accurate value.

Okay heres what I did. White wire form AEM wideband to white wire on pin 73 of the USD
evo 9 ECU. (This is for anyone searching in the future)

now that I have the hardware side in, what is needed on the evoscan side for logging? I have already disabled the rear o2 in perphery so that should free it up for the wideband.

anyone know what to do on evoscan? Is it this one picture below? Are there voltage offsets I need to input?



https://cimg6.ibsrv.net/gimg/www.evo...3b55f6f6d.jpeg
https://cimg5.ibsrv.net/gimg/www.evo...9d046eca7.jpeg
https://cimg7.ibsrv.net/gimg/www.evo...8b3f72d22.jpeg

Adjust the formula in WB02 to match the Gauge.

I was using a formula I. Another thread that walked through it. I’ll give that a shot instead of creating a new loggable value which is whag I was having issues with. Thanks I’ll report back, and I’ll change the name to AEM UEGO

getting this error on a fresh install of evoscan, just teying to change WB02 values, can’t add a new Input either, I have not touched the XML file...
https://cimg8.ibsrv.net/gimg/www.evo...a671bdf89.jpeg

So are you tying all 3 ends together to make a tee like you would tee a vacuum line to a source, or are you just leaving the original white wire clipped off and using the AEM white wire to replace it? Sorry Im a noob with electrical stuff.
And did you ever figure out your issue in evoscan?

He's cutting the oem rear o2 sensor signal wire off the ecu harness entirely and splicing in the 0-5v analog signal that comes from the AEM UEGO gauge. The OEM wire gets tucked away and insulated. This creates a seamless installation for logging AFR because it uses a pre-existing channel in the ECU. You just need to get the right formula to ensure your values are correct. An analog signal means nothing to a computer without a formula to convert it. I might be doing this soon myself to replace my rs232 setup, but I don't want to rip into my interior at the moment lmao....

Yup! It wasnt bad at all. In evoscan I changed the WB02 coding in the XML to what the AEM wideband needed. For label and voltage. Getting the formula right isnthe lain. It’s still not logging 100% accurate. But it’s close