AF learning A-D minimum and maximum threshholds

mike6789 · **Joined:** Tue Jan 26, 2010 9:21 pm **Posts:** 16

td-d wrote:

mike6789 wrote:

is this any different than A/F Learning #1 Limits?? Or is it just useful for picking out A, B, C, D? If I just change my A/F learning limits to 3% that will apply to D as well, correct?

It's different in that it's MAF airflow based as opposed to percentage - it's basically the outer limits of the learning ranges - whereas the AF#1 learning limits is the maximum / Minimum of the actual % that can be applied.

I'm having problems with my ROM in that it starts of great, target AFRs are hit in all ranges, and then after a couple hundred miles things start to get really lean especially at WOT (reflash starts off at 11.5, perfect, then eventually it will drift to 12.5....) can I just 0 out the percentage table and stop the car from learning?

thanks for your help

edit: my AF learning D was at -8% when I was logging in the lean condition, of course on reflash it is at 0%ish for a while

throttlehappy · **Posted:** Thu Dec 13, 2012 11:40 am

mike6789 wrote:

td-d wrote:

mike6789 wrote:

is this any different than A/F Learning #1 Limits?? Or is it just useful for picking out A, B, C, D? If I just change my A/F learning limits to 3% that will apply to D as well, correct?

It's different in that it's MAF airflow based as opposed to percentage - it's basically the outer limits of the learning ranges - whereas the AF#1 learning limits is the maximum / Minimum of the actual % that can be applied.

I'm having problems with my ROM in that it starts of great, target AFRs are hit in all ranges, and then after a couple hundred miles things start to get really lean especially at WOT (reflash starts off at 11.5, perfect, then eventually it will drift to 12.5....) can I just 0 out the percentage table and stop the car from learning?

thanks for your help

edit: my AF learning D was at -8% when I was logging in the lean condition, of course on reflash it is at 0%ish for a while

Change the D range from say 40 to 80.1, it eliminates open loop affect of closed loop D range learning

10% is 1.2 AFR points with an 11.5 target, so you can see why it comes back 1.0 AFR with 8% trim

td-d · **Posted:** Thu Dec 13, 2012 2:30 pm

^ Yup - I would also check to see that you don't have a mechanical cause such as a leak causing the learning.

mike6789 · **Joined:** Tue Jan 26, 2010 9:21 pm **Posts:** 16

td-d wrote:

^ Yup - I would also check to see that you don't have a mechanical cause such as a leak causing the learning.

thank you to you both!

yes i am afraid there MIGHT be a small leak? idk why i just have a feeling... but the car holds boost fine (peaks at 18-21, tapers to 15-12 depending on gear, and this is a td04-13g) and idles well so idk

MFB · **Posted:** Fri Dec 14, 2012 4:43 am

Wouldnt a leak cause trims to go positive? Ive seen trims go negative when the air filter needs changing or when the throttle body has a lot of deposits already that needs cleaning.

td-d · **Posted:** Fri Dec 14, 2012 7:20 am

MFB wrote:

Wouldnt a leak cause trims to go positive?

Well, depends where - vacuum leak, yes, boost leak, no.

throttlehappy · **Posted:** Fri Dec 14, 2012 1:29 pm

MFB wrote:

Wouldnt a leak cause trims to go positive? Ive seen trims go negative when the air filter needs changing or when the throttle body has a lot of deposits already that needs cleaning.

Boost leak causes positives at low g/sec with negatives at higher g/sec

bluescoobywagon · **Joined:** Mon Sep 25, 2006 10:40 pm **Posts:** 25

AE5IA10L (2011 USDM WRX) I believe is:

Min cb280
Max cb290

Learning #1 Airflow Ranges address is cb284 and the values were 1.60 and 80.00 so it looks correct.

throttlehappy · **Posted:** Thu Jun 06, 2013 11:00 am

bluescoobywagon wrote:

AE5IA10L (2011 USDM WRX) I believe is:

Min cb280
Max cb290

Learning #1 Airflow Ranges address is cb284 and the values were 1.60 and 80.00 so it looks correct.

Confirmed

SOd · **Posted:** Wed Nov 20, 2013 1:12 pm

Please help to find A/F Learning #3 (rear lambda) in A2UG000B
Thanks in advance!

min-
max-

viewtopic.php?f=8&t=5019&p=48806&hilit=A2UG000B#p48806

BrandonspecB · **Posted:** Thu Dec 26, 2013 9:06 pm

Any chance someone could find the addresses for me for A2UG000L?

td-d · **Posted:** Thu Dec 26, 2013 9:27 pm

bkatter wrote:

Any chance someone could find the addresses for me for A2UG000L?

Code:

AF_Learning_1_Airflow_Ranges_Max C8AE8 
AF_Learning_1_Airflow_Ranges_Min C8AD8 

BrandonspecB · **Posted:** Thu Dec 26, 2013 9:36 pm

Awesome, thanks so much!!!

flinkly · **Posted:** Thu Aug 13, 2015 2:28 am

so I tried rawecuvalue and masairflow(g/s)1 and I still get numbers that don't make sense (.25 for max, -30 min ... at least one is still above the other!). I pulled both my A2TB001L and A2TB001N XMLs from Github.

can I get addresses for: A2TB001L? (parent of my A2TB001N ROM)

crippsdr · **Posted:** Tue Nov 10, 2015 10:46 am

anyone got these for A2UG002T?

RomRaider

AF learning A-D minimum and maximum threshholds

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