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Complete Rear O2 Delete Patch (88590015)

 
Old Aug 7, 2011, 08:41 PM
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Thumbs up Complete Rear O2 Delete Patch (88590015)

This guide will show you how to "delete" your Rear O2 Sensor without any hardware mods. I did not create these patches; I am simply putting them all in one place to make it easier for people who want to do this.

What does this patch do?
This patch combines the "O2 heater patch" with the "Rear O2 Sim" patch which effectively deletes the rear O2 sim from your car, without throwing any CEL lights.

Full credit for these patches goes to mrfred.

These patches are for ROM ID: 88590015

Step 1

Copy and paste the following table definitions into the appropriate XML definition file for ECU Flash. The default file location is:

C:\Program Files\OpenECU\EcuFlash\rommetadata\mitsubishi\evo\ 88590015.xml

Code:
<table name="Rear O2 Heater Patch" category="Rear O2 Sensor" address="2db04" type="1D" scaling="Hex16" />

<table name="Rear O2 Sim Hook" category="Rear O2 Sensor" address="c250" type="3D" level="1" scaling="Hex16">
<table name="Code" type="Static X Axis" elements="1" scaling="Hex16">
<data>Hex16</data>
</table>
<table name="Address" type="Static Y Axis" elements="10">
<data>C250</data>
<data>C252</data>
<data>C254</data>
<data>C256</data>
<data>C258</data>
<data>C25A</data>
<data>C25C</data>
<data>C25E</data>
<data>C260</data>
<data>C262</data>
</table>
</table>

<table name="Rear O2 Sim Subroutine" category="Rear O2 Sensor" address="4a000" type="3D" level="1" scaling="Hex16">
<table name="Code" type="Static X Axis" elements="1" scaling="Hex16">
<data>Hex16</data>
</table>
<table name="Address" type="Static Y Axis" elements="20">
<data>4A000</data>
<data>4A002</data>
<data>4A004</data>
<data>4A006</data>
<data>4A008</data>
<data>4A00A</data>
<data>4A00C</data>
<data>4A00E</data>
<data>4A010</data>
<data>4A012</data>
<data>4A014</data>
<data>4A016</data>
<data>4A018</data>
<data>4A01A</data>
<data>4A01C</data>
<data>4A01E</data>
<data>4A020</data>
<data>4A022</data>
<data>4A024</data>
<data>4A026</data>
</table>
</table>
Step 2

Once you add the patch, open your rom in ECU flash and verify that the data matches the listing below BEFORE you make any changes:

Rear O2 Sim Hook
E408
D525
6613
D002
400B
0009
A002
0009
0000
D6A2


Rear O2 Sim Subroutine
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF

Rear O2 Heater Patch
4A0B


If everything matches up, you then need to make the following changes. Just go line-by-line:

NOTE: All values are HEX, you must type 0x before each when entering them in ECU Flash. Example: 0x0009


Rear O2 Sim Hook
0009
0009
0009
D002
400B
0009
A002
0009
0004
A000


Rear O2 Sim Subroutine
DA06
6AA1
6AAD
4A09
DB05
6BB1
6BBD
4B09
4B01
3ABC
DB03
2BA1
000B
0009
FFFF
6A64
FFFF
6B36
FFFF
6A68

Rear O2 Heater Patch
0009

Step 3

You are finished. Save the file and flash it to your car. If you did everything correctly you will no longer get a CEL light while running a test pipe or high-flow cat. You can also remove the Rear O2 sensor completely if you want to without any worries. You do not need to make any hardware modifications.


If your car has 885900xx and you would like to change to 88590015

My car had the 88590013 ROM which I changed to 88590015. If your car is stock and has no tuning, then you can simply download the 88590015 ROM image from the link below and flash it after adding the O2 patches. If you have any custom tuning, you would need to copy them from the existing ROM into the newer one.

In all cases the immobilizer code will also need to be copied from the existing ROM to the new one or your car will not start!

Download Stock Evo IX ROM BINs
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Old Aug 7, 2011, 10:22 PM
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I understand this "deletes" the code, but does it disable the readyness monitor as well? In the Dodge software, you can delete the rear o2 as well, but if you go to emissions it fails due to a "not ready" status. Just wondering if you've actually tried going to pass?
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Old Aug 7, 2011, 10:55 PM
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Originally Posted by Straightline View Post
I understand this "deletes" the code, but does it disable the readyness monitor as well? In the Dodge software, you can delete the rear o2 as well, but if you go to emissions it fails due to a "not ready" status. Just wondering if you've actually tried going to pass?
That I cannot answer, but I am going to have my inspection soon so I will update the thread if there are any problems.

There is another patch out there that you can apply which sets all your OBD-II tests to "pass". I added this patch to my rom, but I did not bother to set them all to pass yet.

https://www.evolutionm.net/forums/ec...us-mrfred.html

If I have a problem with the inspection I'll just set it so the O2 sensor "passes" and that's that.
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Old Aug 8, 2011, 06:46 AM
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ive passed obd2 scan inspection with both those patches set up, no problem.

be careful setting all circuits to pass, you really need to set it to the factory settings since the car doesnt actually have obd2 monitoring of all the available choices.
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Old Oct 29, 2011, 12:16 PM
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new to the EVO forum and the EVO world all together. i bought my EVO from the orginal owner who never bothered to do this. can someone else me get started ?
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Old Oct 29, 2011, 02:08 PM
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Update 10/29/2011:

Passed inspection with no problems using this hack. Working great. After setting this up my car stopped throwing those annoying 0420 OBD codes.


Originally Posted by gomcar25 View Post
new to the EVO forum and the EVO world all together. i bought my EVO from the orginal owner who never bothered to do this. can someone else me get started ?
It's not that hard to do. Download ECUFlash and buy the USB cable they sell for your particular car. That's all you need.
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Old Oct 29, 2011, 05:44 PM
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Could I use a serial cable ?
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Old Oct 29, 2011, 11:13 PM
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No, if you want to use ECUFlash you'll need to get the cable they sell. It's only $60 or so and it's worth it if you plan to do any ecu tuning.
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Old Oct 30, 2011, 08:59 AM
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K
Originally Posted by SsZERO View Post
No, if you want to use ECUFlash you'll need to get the cable they sell. It's only $60 or so and it's worth it if you plan to do any ecu tuning.
So I noticed your in philly you interested in helping a guy out ? 5706905591
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Old Nov 20, 2011, 05:04 PM
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New here...I just found that I have ROM ID: 94170008; the most common ID seems to be 88590015. Is there a way to change my ROM ID to another? I'd really like to use this O2 patch. I just bought the car and from what I'm told it has been tuned. Looks that way from the fuel maps too...any help would be great.
thanks


'03 VIII
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Old Nov 20, 2011, 08:57 PM
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Originally Posted by nickferguson08 View Post
New here...I just found that I have ROM ID: 94170008; the most common ID seems to be 88590015. Is there a way to change my ROM ID to another? I'd really like to use this O2 patch. I just bought the car and from what I'm told it has been tuned. Looks that way from the fuel maps too...any help would be great.
thanks


'03 VIII
The rom ID is like the version/revision number. If it was part of the same series then the first 6-7 digits would be the same. Yours is a completely different version from the "8-series" and you probably cannot flash from 9-series to 8-series or vice versa without some kind of problems. There may be actual hardware differences between the two ECUs, and almost certainly differences in the addressing spaces (the sections of software where the O2 removal codes have effect).

I do believe there is a similar process for O2 sensor deletion that can be done with 9-series rom images, but you'll have to search these forums to find it.
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Old Nov 21, 2011, 09:01 AM
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you are in philly?? i dont think ive never met u before

i found this for my 96530706
Im a little confused as to which procedure i need to go with....
First of all, are you running Tephra?

Originally Posted by scheides View Post
So you run 96530706 and literally just did:

Code:
<table name="Rear O2 Heater Patch" category="Mods" address="2c62a" type="1D" scaling="Hex16" />
and changed "4A0B" to "0009" and that's it? I shall give this a try.


**edit** I tried it, it seems to work great! I have the rear o2 completely unplugged. I'll make sure nothing silly becomes of it over the next week but all seems fine for now.




Originally Posted by donner View Post
All you need to do is:

1) Activate Rear O2 simulator from Tephra options

2) Add following patch to your 96530006.xml to disable rear O2 heater cell (set Rear O2 Heater Cell Enable to value 0 to disable cel):

Code:
<table name="Heater CEL" category="Rear O2" address="2c625" type="2D" level="2" scaling="blobbits">
        <table name="Bit values" type="Static Y Axis" flipy="true" elements="8">
            <data>N/A</data>
            <data>N/A</data>
            <data>N/A</data>
            <data>N/A</data>
            <data>Rear O2 Heater CEL Enable</data>
            <data>N/A</data>
            <data>N/A</data>
            <data>N/A</data>
        </table>
</table>
After these two steps you are able to completely remove your rear O2 sensor and wire your AEM analog output to rear O2 input. You can then datalog AEM voltage from MUT 3C and with correct equation from voltage to AFR you are directly able to datalog AFR with ie Evoscan.





I hear this is all i need to do in a different thread. which procedure do i follow? this or yours?

Last edited by bnr34rb26dett; Nov 21, 2011 at 09:04 AM.
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Old Nov 21, 2011, 01:44 PM
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Originally Posted by bnr34rb26dett View Post
you are in philly?? i dont think ive never met u before

i found this for my 96530706
Im a little confused as to which procedure i need to go with....
First of all, are you running Tephra?

I hear this is all i need to do in a different thread. which procedure do i follow? this or yours?
Yeah I think you're good. It is easier to perform this mod on the newer roms so you don't need to do the process that I listed for people who have older roms. I'm not using tephra's settings; I'd rather make changes to the ECU only if I need to.
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Old Nov 21, 2011, 05:24 PM
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ok great thanks for the clarification!
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Old Nov 23, 2011, 10:33 AM
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I want to thank you for writing this, although I don't think I will need to use it.
My gratitude comes from someone taking the time and making specific threads for solutions which so many need instead of reading 100+ page threads and trying to find all the information that you need.

I honestly believe majority of these threads need to be rewritten and broken down based on ROM's and such, although that takes a lot of time, I'd be willing to do it if I understood everything 100%... but I don't unfortunately
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