AF#3 (Rear O2 sensor) correction limits

scootarida1 · **Joined:** Fri Oct 26, 2012 2:33 pm **Posts:** 25

td-d wrote:

These much older roms are a little trickier in terms of finding these - but here are the rear O2 compensation tables:

ROM:0002B004 Closed_loop_fueling_target_comp_RearO2_min:.float -0.5
ROM:0002B008 Closed_loop_fueling_target_comp_RearO2_max:.float 0.5

Perfect, thanks.

covertrussian · **Joined:** Tue Jan 28, 2014 10:48 am **Posts:** 120

Trying to find the proper addresses for two cars. I used a hex editor and searched for 3F 00 00 00 BF 00 00 00, but getting some inconclusive results. I couldn't even find anything related to the last two strands that first post talks about "4F22C79A F808D59A"

First car is an 04 Forester XT 5MT A2ZJ500I, searching for "3F 00 00 00 BF 00 00 00" got me to 26ab0, but correction limits are -50, 0.

Next car is 05 Legacy GT 5MT A2WC510N, searching for "3F 00 00 00 BF 00 00 00" gave me fairly inconclusive results, then I remembered that older cars have High/Low upside down, so searched for "BF 00 00 00 3F 00 00 00", found cda30, that has -50, 50. Looks more on par, but not sure.

Help is greatly appreciated!

scootarida1 · **Joined:** Fri Oct 26, 2012 2:33 pm **Posts:** 25

td-d wrote:

These much older roms are a little trickier in terms of finding these - but here are the rear O2 compensation tables:

ROM:0002B004 Closed_loop_fueling_target_comp_RearO2_min:.float -0.5
ROM:0002B008 Closed_loop_fueling_target_comp_RearO2_max:.float 0.5

Is this just target or is there addresses for correction aswell?

covertrussian · **Joined:** Tue Jan 28, 2014 10:48 am **Posts:** 120

Well it looks like there is no easy way to find the right values without IDA, only via trial and error. Luckily I found the AF correction values for A2WC522N (which is an upgrade to A2WC510N)

Now looking for values for A2ZJ512I, which is an upgrade to A2ZJ500I.

td-d · **Posted:** Mon Feb 10, 2014 8:31 am

covertrussian wrote:

Well it looks like there is no easy way to find the right values without IDA, only via trial and error. Luckily I found the AF correction values for A2WC522N (which is an upgrade to A2WC510N)

Now looking for values for A2ZJ512I, which is an upgrade to A2ZJ500I.

I'm not 100% on these, but test drive:

Code:

ROM:000293C4 AF3_Correction_Limits:.float 0.5        ; DATA XREF: sub_291FC:loc_29378o
ROM:000293C8 flt_293C8:      .float -0.5             ; DATA XREF: sub_291FC+180o

ROM:00026E68 Closed_loop_fueling_target_comp_RearO2_max:.float 0.5
ROM:00026E6C Closed_loop_fueling_target_comp_RearO2_min:.float -0.5

scootarida1 · **Joined:** Fri Oct 26, 2012 2:33 pm **Posts:** 25

td-d wrote:

These much older roms are a little trickier in terms of finding these - but here are the rear O2 compensation tables:

ROM:0002B004 Closed_loop_fueling_target_comp_RearO2_min:.float -0.5
ROM:0002B008 Closed_loop_fueling_target_comp_RearO2_max:.float 0.5

Could you locate the AF3 Correction Limits as well?

covertrussian · **Joined:** Tue Jan 28, 2014 10:48 am **Posts:** 120

td-d wrote:

I'm not 100% on these, but test drive:

Code:

ROM:000293C4 AF3_Correction_Limits:.float 0.5        ; DATA XREF: sub_291FC:loc_29378o
ROM:000293C8 flt_293C8:      .float -0.5             ; DATA XREF: sub_291FC+180o

ROM:00026E68 Closed_loop_fueling_target_comp_RearO2_max:.float 0.5
ROM:00026E6C Closed_loop_fueling_target_comp_RearO2_min:.float -0.5

Thank you kind sir!

covertrussian · **Joined:** Tue Jan 28, 2014 10:48 am **Posts:** 120

Is it more important zero out "AF3_Correction_Limits" or to zero out the "Closed_loop_fueling_target_comp_RearO2"?

For A2WC522N I used def's that you posted here

Code:

ROM:0002C91C Closed_loop_fueling_target_comp_RearO2_min:.float -0.5
ROM:0002C920 Closed_loop_fueling_target_comp_RearO2_max:.float 0.5

With target comp zeroed out, my AF #3 Correction 32bit was still swinging around.

scootarida1 · **Joined:** Fri Oct 26, 2012 2:33 pm **Posts:** 25

covertrussian wrote:

Is it more important zero out "AF3_Correction_Limits" or to zero out the "Closed_loop_fueling_target_comp_RearO2"?

For A2WC522N I used def's that you posted here

Code:

ROM:0002C91C Closed_loop_fueling_target_comp_RearO2_min:.float -0.5
ROM:0002C920 Closed_loop_fueling_target_comp_RearO2_max:.float 0.5

With target comp zeroed out, my AF #3 Correction 32bit was still swinging around.

I found the same thing to be true which is why I was asking for the addresses for the AF3 Corrections since I only have the targets.
I find my corrections will still move around. If I get the addresses I will end up just zeroing out both.

td-d · **Posted:** Wed Feb 12, 2014 4:06 pm

covertrussian - was that the correct address for the AF3 correction limits?

td-d · **Posted:** Wed Feb 12, 2014 4:08 pm

scootarida1 wrote:

I found the same thing to be true which is why I was asking for the addresses for the AF3 Corrections since I only have the targets.
I find my corrections will still move around. If I get the addresses I will end up just zeroing out both.

If I was correct on covertrussian's AF3 correction address, then this is the af3 correction limits address:

Code:

ROM:0002D9D8 AF3_Correction_Limits:.float 0.5

covertrussian · **Joined:** Tue Jan 28, 2014 10:48 am **Posts:** 120

I haven't tried A2ZJ512I's items that you posted, I need to flash the car to that code version first, little scared since battery could use a recharge.

So it seems like all three fields need to be updated that right?

EDIT: Just reread the other thread and it finally clicked. I for some reason thought both of the threads were talking about correction limits, but it's more of this one is about correction limits other thread is about target limits.

td-d wrote:

....
So AF3 correction, in testing, has seen the biggest impact - in that zeroing it completely removes short term AF corrections based on the rear O2 sensor.

In testing, zeroing these rear O2 compensation limit also made fueling in closed loop less variable. So I assume - but have not had the chance to test - that if you completely remove the rear O2 sensor, you would have to both zero the AF3 corrections and zero these limits (and of course remove the CELs) to completely get rid of the rich closed loop conditions that were noticed with the rear O2 delete.
...

In which case, @td-d, if you can post A2WC522N Correction limits (since I have comp limits already), I can test it with no rear O2 sensor.

scootarida1 · **Joined:** Fri Oct 26, 2012 2:33 pm **Posts:** 25

So are there only Closed_loop_fueling_target_comp_RearO2 or are there AF3_Correction_Limits as well for A2WC410I?

td-d · **Posted:** Mon Feb 17, 2014 10:47 am

scootarida1 wrote:

So are there only Closed_loop_fueling_target_comp_RearO2 or are there AF3_Correction_Limits as well for A2WC410I?

Look two posts up, and you'll see I posted the AF3 addresses as well.

covertrussian · **Joined:** Tue Jan 28, 2014 10:48 am **Posts:** 120

td-d wrote:

covertrussian wrote:

Well it looks like there is no easy way to find the right values without IDA, only via trial and error. Luckily I found the AF correction values for A2WC522N (which is an upgrade to A2WC510N)

Now looking for values for A2ZJ512I, which is an upgrade to A2ZJ500I.

I'm not 100% on these, but test drive:

Code:

ROM:000293C4 AF3_Correction_Limits:.float 0.5        ; DATA XREF: sub_291FC:loc_29378o
ROM:000293C8 flt_293C8:      .float -0.5             ; DATA XREF: sub_291FC+180o

ROM:00026E68 Closed_loop_fueling_target_comp_RearO2_max:.float 0.5
ROM:00026E6C Closed_loop_fueling_target_comp_RearO2_min:.float -0.5

Upgraded the car to A2ZJ512I and zeroed out the above, still saw AF#3 move from 0.0 to -1.x. With everything zeroed out AF#3 32bit should stay at 0 always correct?

RomRaider

AF#3 (Rear O2 sensor) correction limits

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