P0420 CEL fix rear 02 sensor
i'm an impatient little boy.... 
Evolved Member
Joined: Apr 2002
Posts: 697
Likes: 1
From: Perth, Western Australia
I might have a fix for you guys as I located the settings for that test on a different rom. I've just been testing a tool I wrote that auto-extracts all the settings from an unknown rom. If I can get a database from one of you fellow disassemblers I can run the plugin on it and see if it uses the same code as the colt turbo. The patch has been tested on that and it works.
-Michael
-Michael
Seems to be working great! I haven't gone WOT to confirm the AFRs haven't changed significantly (waiting on fuel relay), but 3/4 throttle is ok.
If HB doesn't see any adverse effects, I think you found it
I'll let you know if anything changes over the next little while, and I'll confirm WOT as soon as possible.
If HB doesn't see any adverse effects, I think you found it
I'll let you know if anything changes over the next little while, and I'll confirm WOT as soon as possible.
Seems to be working great! I haven't gone WOT to confirm the AFRs haven't changed significantly (waiting on fuel relay), but 3/4 throttle is ok.
If HB doesn't see any adverse effects, I think you found it
I'll let you know if anything changes over the next little while, and I'll confirm WOT as soon as possible.
If HB doesn't see any adverse effects, I think you found it
I'll let you know if anything changes over the next little while, and I'll confirm WOT as soon as possible.
since it seems to work ok - I posted up the xml code in post #1 of my DTC Disable Thread...
as usual take the usual precautions when doing this (ie log AFR to make sure it hasn't changed)
as usual take the usual precautions when doing this (ie log AFR to make sure it hasn't changed)
Evolved Member
Joined: Mar 2008
Posts: 730
Likes: 3
From: Lattitude 48.38°, Longitude 17.58°, Altitude 146m = Slovakia, for common dude
If I am not misaken
P0421 - catalyst efficiency monitoring can be disabled by setting 503AF to 0
P0133 - O2 slow response monitoring can be disabled by setting 503AD to 0
This patern can be followed for all formerly known DTC periphery bits.
For X they have their own setting and they are not bitcoded anymore.
(53040010 - I guess any M32R ROM)
P0421 - catalyst efficiency monitoring can be disabled by setting 503AF to 0
P0133 - O2 slow response monitoring can be disabled by setting 503AD to 0
This patern can be followed for all formerly known DTC periphery bits.
For X they have their own setting and they are not bitcoded anymore.
(53040010 - I guess any M32R ROM)
Last edited by acamus; Jan 26, 2010 at 04:12 AM.
Evolved Member
Joined: Mar 2008
Posts: 730
Likes: 3
From: Lattitude 48.38°, Longitude 17.58°, Altitude 146m = Slovakia, for common dude
I would have to have a look, but my message is there are enable monitoring bytes for various DTC and at least in CT9A world the offset is fixed, I have crosschecked only those two and sequence of their execution is the same in CT9A.
Edit:
54550003,52350016 is the same
55570005, 55590006 is shifted 8 bytes
Edit:
54550003,52350016 is the same
55570005, 55590006 is shifted 8 bytes
Last edited by acamus; Jan 26, 2010 at 05:33 AM.
Evolving Member
Joined: Sep 2007
Posts: 209
Likes: 0
From: Over there!
It's P0139 that I think people are getting. That's the Rear O2 Slow Response.
Is this confirmed as working tephra? I don't mind testing...but if you posted it I guess its confirmed by a bunch of people? I'm running MR ROM 21
verkion
Is this confirmed as working tephra? I don't mind testing...but if you posted it I guess its confirmed by a bunch of people? I'm running MR ROM 21
verkion
Thread Starter
Newbie
Joined: Aug 2009
Posts: 3
Likes: 0
From: Nottingham
Can you confirm the process of disabling the rear02 sensor (P0420)?
I’ve been in the ECU_OPTIONS section, Which 'ECU Option set' is it?
Then which 'bit.#' is it?
I'm assuming that its changed from 1 to 0
I’ll see what other CELs pop up after
Thanks
Rewind
Evolving Member
Joined: Sep 2007
Posts: 209
Likes: 0
From: Over there!
Well, now I know for sure E6-X didn't toast his ECU due to the P0139/P0420 bit toggle...I just toggled mine and my car is still fine. Hahahaha. I need to go through about 2-3 Engine on/off cycles before the P0139 is normally set. So I'll know by tomorrow whether it works on an MR!
Thanks Tephra, xPRimNT, acamus, colby, gunzo, ummm...and everyone else that makes Evo Tuning possible :-P (I feel like I'm at the Oscars...)
verkion
Thanks Tephra, xPRimNT, acamus, colby, gunzo, ummm...and everyone else that makes Evo Tuning possible :-P (I feel like I'm at the Oscars...)
verkion