need Evo 9 owner to test rear O2 *heater* sim patch
Jan 26, 2009 | 07:50 AM
#1
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From: Tri-Cities, WA // Portland, OR
need Evo 9 owner to test rear O2 *heater* sim patch
With a bit of help from acamus, I now understand the rear O2 heater OBD-II test algorithm enough to write a patch to simulate the rear O2 heater status so that the rear O2 sensor can be removed entirely. I need some help testing the patch though because my rear O2 sensor is still installed. I need an Evo 9 owner who has removed their rear O2 sensor, is not running the resistor mod, and has time to help me test a patch. Thanks.
MR Turco Update:
MR Turco Update:
That's actually rather clever. 
I like, especially if tephra was going to include it. For grins, I looked up 96940011, though, and it's a little different (although not so much that the same trick wouldn't work):
Honestly, I think it's probably just easier for folks who need this to just NOP the jsr to the test routine, and call it a day, unless tephra's going to include this as a tweakable item.
So, to summarize so far, here's a minimal addition for your XML:
96530006:
96940011:
88590015:
94170015:
Open up the ROM, navigate to the "Mods" section, change "Rear O2 Heater Patch" from "4A0B" to "0009", and you should no longer throw a rear O2 heater code. Change it back to get your CEL back. 
EDIT: I originally posted a typo in the address for 96940011.
I like, especially if tephra was going to include it. For grins, I looked up 96940011, though, and it's a little different (although not so much that the same trick wouldn't work): Code:
loc_2E722: ! CODE XREF: sub_2E678+A2
mov.l @(0x13C,pc), r10 ! [0002E860] = unk_FFFF8A10
mov.w @r10, r10
extu.w r10, r10
tst r8, r10
bt loc_2E732
mov.l @(0xE8,pc), r10 ! [0002E818] = sub_32780
jsr @r10 ! sub_32780
nop
So, to summarize so far, here's a minimal addition for your XML:
96530006:
Code:
<table name="Rear O2 Heater Patch" category="Mods" address="2c62a" type="1D" scaling="Hex16" />
Code:
<table name="Rear O2 Heater Patch" category="Mods" address="2e72e" type="1D" scaling="Hex16" />
Code:
<table name="Rear O2 Heater Patch" category="Mods" address="2db04" type="1D" scaling="Hex16" />
Code:
<table name="Rear O2 Heater Patch" category="Mods" address="2c48e" type="1D" scaling="Hex16" />
EDIT: I originally posted a typo in the address for 96940011.
Last edited by MR Turco; Mar 21, 2010 at 02:03 PM.
Jan 26, 2009 | 09:38 AM
#6
If you are reasonably confident in it I can unplug within the next week (man, next weekend is going to be busy with sports ! ). I'll keep an eye on the thread if no one else volunteers, but feel free to post/pm/email it to me so I can fire it up if I have a minute....
). I'll keep an eye on the thread if no one else volunteers, but feel free to post/pm/email it to me so I can fire it up if I have a minute....
Jan 26, 2009 | 09:39 AM
#7
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From: Tri-Cities, WA // Portland, OR
I'm still undecided about exactly how I'll implement the patch, so I need someone who doesn't mind having their rear O2 heater unplugged for a few days. It would be better to have someone who has already removed the rear O2 sensor because unplugging the O2 sensor without removing it will damage it pretty quickly.
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Jan 26, 2009 | 09:54 AM
#10
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From: Tri-Cities, WA // Portland, OR
ok. Who should I PM about getting a copy of Kracka's ROM?
Last edited by mrfred; Jan 26, 2009 at 09:58 AM.
Jan 26, 2009 | 10:00 AM
#12
Jan 26, 2009 | 10:02 AM
#13
Fantastic! email me as well. I can test it on roseys car (has a bad heater circuit in stock rear o2, so he's an ideal candidate! )
chris at snowsecurity.com. I have his latest rom on my laptop, I'll shoot it to ya.
)chris at snowsecurity.com. I have his latest rom on my laptop, I'll shoot it to ya.
Jan 26, 2009 | 10:21 AM
#15
Scheides i think you have my last rom....
I'm excited for this... getting sick the CEL Light! Thanks mrfred!