It looks like you are a half a volt off, the AEM should be outputting 2.3 volts at 14.7AFR, it looks like you don't have the voltage offset grounded, which is the orange wire in the same harness as the yellow wire you are using for signal. Once you ground that orange wire to the same place as your wideband is grounded you should see a voltage increase of exactly .5 volts.

 

Have had the same problem.
I'll go over the info in this thread. Then if everything is
good. I will try that cable from radio shack. It worked fine
2 years ago. And while I was in the middle of a e-tune (almost done)
it quit reading correctly on ATR.
Would like to get it working right again.
Will post back up when I've double checked everything in this thread.
Thanks for this thread!

 

Alright guys. I attempted the logging AFR via ECU mod last night. I HAVE A COBB AP V3. I have my red power wire from my UEGO in an add a fuse link into the fuse box under driver for switched power, the black wire is grounded to the chassis ground by the passenger foot, and I am running my white analog wire from my UEGO to the yellow wire in the rear o2 sensor harness.

I have my rear o2 sensor removed from my test pipe and zip tied under the vehicle. The harness is unplugged under the passenger seat. I have two T-connectors on the yellow and orange wire in the rear o2 sensor harness. When i have my white wire hooked up and my car running(I put spade connectors on all of them so I can experiment), nothing happens on the cobb AP. The WB AEM AFR gauge stays static at 10 (Beforehand it actually fluctuated. Also, im logging rear o2 voltage, and it stays at 0.00v as well. Shouldn't I be getting some sort of voltage there? I am assuming that's how the V3 calculates AFR.

Also, code p0037 just popped up too. Im testing to see if I can get my AP V3 working correctly with the wideband to see if Cobb updated their formula. I have spliced in to the orange wire with a T connector(in the same harness as the yellow) and have spade connectors at the ends so I can ground that if I need to(I have a wire grounded to the same place the UEGO is grounded). The orange wire is currently NOT grounded. The only thing hooked up is the white to yellow. I ran wires with spades for testing purposes.

What gives? I'm pretty sure I should be getting some sort of rear o2 voltage read on my AP...
__________________

 

I used to have this SAME EXACT issue!

The Staples USB to Serial works just fine with Windows 7. It is just a Belkin F5U409 rebranded with the Staples logo.

You just need to download the correct drivers:

http://www.clearchain.com/blog/posts...bit-mac-osx-10


Once you have the drivers you should be golden. No sense in buying the expensive wire unless you have to use windows 8.

 

I hate reviving old threads but i'm having this same issue and i'm at the point in my e-tune where i need AFRs and i cant connect either of my cables to my win 8 laptop. I need to finish this tune before before June. Ive tried all the advice, checked the drivers, bought a new cable, re-downloaded access-tuner race. I'm lost. Ive tried the above on two different win 8 laptops.

 

I bought a Win8 laptop recently and no dice on any cables I tried. It is all about the drivers! You need to find a cable that has pure windows 8 drivers and not just windows 8 driver "support". I solved my problem by using a friends older Win7 laptop haha. Was too lazy to re-solder another cable on.

There are very few cables that have dedicated Win8 drivers and they are pretty pricey too.

 

But are the dedicated win 8 cables guaranteed to work...has anybody did this with windows 8 im not trying to back track my win8 to win7. For those with macs have you been able to do a virtual of win7 and it wirks?


I used putty to check the data but i got 016-022 when my WB said 11-17.9 is this correct?


Now ive tried two different cables, two different drivers, two different laptops...Is Win 7 the only way to get this to work???

 

Bumping this old thread to see if anyone has a link to a cable that will work with Windows 8 to log with.

 

Nevermind. Ended up needing to check uego gasoline instead of AEM wideband to log and moniter.

 

I had the same problem until I've noticed that you have to have both the access tuner and rs-232/usb cable installed to the computer at the same time. so, access tuner hooked up to your car"s obd2 with the usb cable from access tuner to computer and then the rs-232 cable to computer. hope that helps everyone

 

I kind of rushed the install thinking I was badass, then realized duh..... 30 mins later after re-reading instructions, Access tuner had to be connected to computer as well with the rs-232 from the AEM Uego Gauge . Only if they made the instructions more simple with more pictures