Good stuff Mark i have just seen this post now.

I may make a harness to make use of the autolearn feature on the greddy EMU (its been tuned previously on a dyno manually by me), can anyone tell me which wire specifically is the 0-5v source on the AEM UEGO?, i believe its the white wire on the AEM?

Can i take the voltage from a wire going to the AEM afr gauge or does it need to come from the W/B sensor itself? or the connector on the W/B sensor itself?

Also what do i put in the range from the AEM UEGO?, is it 10.0 to 20.0?

Thanks

 

Mark,

I guess its worth pointing out you could retain the stock o2 sensor, and just use the afr target map to populate the injector cell data then when you are happy disconnect it from the GEMU. Thus it cant alter it on the fly. In the Uk we don't really get a massive temp difference say 0c to 22c and between this points i think the AFR would be +/- 0.2 (generally richer in hot months) since stock ECU is still in the loop.

I am possibly going to do this in combination with my dyno, to smooth out the AFR someone and call it a day after i've checked over the timing.

I need to have another think about it though.

Cheers

 

Yes you can maintain the stock O2 however a simulated narrow band 0-1V output from a wideband controller is always going to be a cleaner signal than the stock O2


I also thing you are referring to using the A/F feedback to change the A/F in closed loop conditions. While this is possible you must target A/Fs that are not out of the check sum applied inside the Stock PCM for closed loop operations AKA ~14.7 under light loads.

I did not cover OEM PCM closed loop conditions A/F feedback this in the DYI as 99.9% of the owners dont realy need to change the A/Fs in that area.

The 0-1 voltage simulated narrow band signal must come out of the wideband controller you cannot tag a wire directly on a Wideband sensor for this 0-1 vsignal like is done on a narrow band sensor.

 

You can change what the "closed-loop" conditions are by changing the analog out map. The OEM ECU goes into open-loop at 60% throttle. If you change the map so 20% is output as 60%, well, you get the idea...

 

Hi Mark/Brad,

Apologies if I'm talking gobbledy gook I'm running on low sleep ATM .

I wish to use the A/F feature for open loop only - well for the time being. For starters i will just make the harness then get the log in the GEMU to log the AFR.

Brad, as above. Any idea where exactly i connect the wires to the AEM UEGO? . I believe its a white wire which is the 0-5v on the AEM but where exactly do i take it from (gauge, sensor etc) and also i take it you grounded it too (and where to please)?.

Am i right in thinking you have an AEM EUGO wideband?

Thanks guys.

 

I do not have the AEM UEGO. So I can't answer that one for you.

 

Here is a PLX example

 

It can't be much different, just look for a pinout from the UEGO and figure out where the ground and 0-5V signal are.

 

Thanks for the diagram Mark.

Apparently there is a white wire which is 0-5v to the gauge and a brown wire from sensor which is 0-5v too.

Confused

 

You want the white wire from the gauge, as well as the black wire from the gauge. Both come from the 4 pin connector. I stated all this in my PM to you.