Logging Wideband AFR via Rear O2 ECU ADC Input
Aug 11, 2011, 10:04 AM
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Aug 11, 2011, 11:34 AM
#48
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The oem rear O2 gauge its still in place, the only wire i removed was the white wire from the ecu and tap the Wideband analog out wire, does it mather? Or i just need to unplug the Oem O2 sensor?...
Really i dont know what more do i need to check it out....
Anyone with this similar issue?
Thanks
Last edited by FLAT4; Aug 11, 2011 at 11:45 AM.
Aug 11, 2011, 12:04 PM
#49
Hy Dsm Riders... I have this problem with my evoscan an Aem Uego reading...
Im trying to get my wideband to read correctly through the rear OEM O2 sensor imput, i cut the white wire on my ecu from the OEM rear O2 pin 73 on my evo 9, and tap to the white wire from the uego, i have teprha V7 88580714 ROM and i enable the rear O2 simulation option and flash it back, the rear O2 is still in place, no removed yet, no mut table chance since its getting the reading from the Oem O2 sensor mut 3C table 8409, i use evoscan V 2.7 0090 and i use this formula 10+(20-10)*x/255on the WBO2 eval and the reading its off by aprox 2.6 afr, so what do i need to check it out? I tried sevarl times with different formulas and i cant log it just right
Anyone who can point me in the right direcction would be great...
Thanks in advance
Im trying to get my wideband to read correctly through the rear OEM O2 sensor imput, i cut the white wire on my ecu from the OEM rear O2 pin 73 on my evo 9, and tap to the white wire from the uego, i have teprha V7 88580714 ROM and i enable the rear O2 simulation option and flash it back, the rear O2 is still in place, no removed yet, no mut table chance since its getting the reading from the Oem O2 sensor mut 3C table 8409, i use evoscan V 2.7 0090 and i use this formula 10+(20-10)*x/255on the WBO2 eval and the reading its off by aprox 2.6 afr, so what do i need to check it out? I tried sevarl times with different formulas and i cant log it just right
Anyone who can point me in the right direcction would be great...
Thanks in advance
https://www.evolutionm.net/forums/ec...-evo-scan.html
https://www.evolutionm.net/forums/ev...-evo-scan.html
https://www.evolutionm.net/forums/la...o-evoscan.html ---his equation is wrong though, not sure how his offset was off by 1.
If you are off by 2.6 AFR you may have a ground loop or a poor power / ground. Your sensor my also be going bad (but that is less likely).
I have a few posts about this but this is the eval I used
Eval="0.039137255*x+10.11833"
It is adjusted for the ground offset that was on my car.
It is basically the same as x/255+10
----
Double ninja edit: I didn't use the analog input much other than for narrowband simulation, but that equation looks wrong now that I'm looking at it.....
----
Triple ninja edit... I see now that I had already applied the factor of 10 to the multiplied value. It is really the same as:
(x*10)/255+10
Last edited by fostytou; Aug 11, 2011 at 01:06 PM.
Aug 11, 2011, 02:50 PM
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https://www.evolutionm.net/forums/6145781-post11.html
https://www.evolutionm.net/forums/ec...-evo-scan.html
https://www.evolutionm.net/forums/ev...-evo-scan.html
https://www.evolutionm.net/forums/la...o-evoscan.html ---his equation is wrong though, not sure how his offset was off by 1.
If you are off by 2.6 AFR you may have a ground loop or a poor power / ground. Your sensor my also be going bad (but that is less likely).
I have a few posts about this but this is the eval I used
Eval="0.039137255*x+10.11833"
It is adjusted for the ground offset that was on my car.
It is basically the same as x/255+10
----
Double ninja edit: I didn't use the analog input much other than for narrowband simulation, but that equation looks wrong now that I'm looking at it.....
----
Triple ninja edit... I see now that I had already applied the factor of 10 to the multiplied value. It is really the same as:
(x*10)/255+10
https://www.evolutionm.net/forums/ec...-evo-scan.html
https://www.evolutionm.net/forums/ev...-evo-scan.html
https://www.evolutionm.net/forums/la...o-evoscan.html ---his equation is wrong though, not sure how his offset was off by 1.
If you are off by 2.6 AFR you may have a ground loop or a poor power / ground. Your sensor my also be going bad (but that is less likely).
I have a few posts about this but this is the eval I used
Eval="0.039137255*x+10.11833"
It is adjusted for the ground offset that was on my car.
It is basically the same as x/255+10
----
Double ninja edit: I didn't use the analog input much other than for narrowband simulation, but that equation looks wrong now that I'm looking at it.....
----
Triple ninja edit... I see now that I had already applied the factor of 10 to the multiplied value. It is really the same as:
(x*10)/255+10
Lets the tune beging
Feb 24, 2014, 01:51 PM
#51
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Hello, I'm having trouble logging my wideband through my rear o2 on my Evo x. I can't seem to find my ADC memory address. My ROM id is 52680015. I got it narrowed down to AFR= 2.375*V + 7.3125. V = 5*ADC/1023 thx
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