MapECU3

E4-21 is the primary AFR sensor which you should be tapped into with the AFR module to tune in closed loop. E4-25 is the secondary o2 sensor which monitors catalytic converter function, so monitoring it isn't useful. For our application, you want to connect the 0-5 volt signal from an aftermarket wideband sensor to the yellow wire for logging purposes.

 

I did the wiring according to the schematic
http://www.mapecu.co.nz/forum/attachment.php?attachmentid=1444&d=1548739853
So you’re saying once I get a wideband sensor (I thought our truck came with one) I need to add the 16 pin yellow wire to the 0-5v wire directly off the new sensor?

 

Our trucks come with an AFR sensor which is similar to a wideband sensor. The sensor output is current based vs voltage based which is why we need the AFR module to alter the signal. We're using the AFR module to alter the signal for tuning purposes, so we can't monitor/log that signal anymore because it won't be true to what the engine is running. The majority of your tuning will be in closed loop because these trucks run closed loop forever. Open loop is only at the top of the rev range under WOT.

You don't tap directly into the signal coming from the aftermarket wideband sensor. The sensor controller will have a 0-5 volt output, which is what you connect the yellow wire to.

 

Very nice explanation thank you that’s exactly what I have been figuring out here. There’s a afr kit that I’m checking out.
AEM 30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge

$188 AEM 30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge

https://www.amazon.com/dp/B0184TSI84/ref=cm_sw_r_cp_api_i_t1eyCbWZCEXZ2
Do you remember what you installed?
Ever get a chance to get a shot of the numbers you dialed in and your tbl?
I’ve got mine 99% dialed in now but it would be interesting to compare.

The crazy thing with my tbl flies from mapecu is that I can’t see them in their folder to upload them to a post but they’re always there to load into mapcal.

 

I run the PLX AFR setup.

Unless you're running MAF Elimination, my maps will be no good for your setup. Also, my laptop battery is toasted, so it has to be plugged in which makes it a pain to deal with away from my desk.

If you search for the map name, you can find it. It saves them in a weird place.

 

I have done a search for the name and even the type. It straight up doesn’t exist on my computer for some reason it’s crazy. Not the biggest deal just can’t help others as much

 

Old thread here I know but does anyone know if the AFR calibrator would be needed with a MapEcu3 to tune in closed loop with an ecu that uses an narrowband upstream O2 as opposed to an actual AFR sensor? My truck is a 1997 T-100 5vzfe that will be getting a turbo soon

 

Um so on 2001 in pic with blue is that one I connect brown to