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Title: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: alizczewy on March 23, 2017, 04:11:03 AM Hi guys,
I tried to solve this issue by myself, but no success as far. The car is RS6 4.2 BCY 4D1907558 0004. I mapped the car two month ago, dyno showed 497hp / 680Nm Three weeks after remapping engine management light appeared on the dash and I car went in to limp mode. VCDS showed: 16985 Internal control module: memory check sum error P0601-35-00-- So I've changed CLAAATUN to 0 and fault p0601 disapered and Limp mode gone as well. I thought it solved the issue, but I was wrong. Yesterday I've get the limp mode again, but this time no MIL on dash and no faults in error memory. I did some logs today and it seems, for some reasons something cuts rl_max at 100%, so throttle and boost is restricted. Funny thing is when I upload same software again up to 2-3 week is ok and then LIMP MODE returns. Have you had similar issue? I attach log from ME7Logger and modified dump. Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: littco on March 23, 2017, 06:31:12 AM Hi guys, I tried to solve this issue by myself, but no success as far. The car is RS6 4.2 BCY 4D1907558 0004. I mapped the car two month ago, dyno showed 497hp / 680Nm Three weeks after remapping engine management light appeared on the dash and I car went in to limp mode. VCDS showed: 16985 Internal control module: memory check sum error P0601-35-00-- So I've changed CLAAATUN to 0 and fault p0601 disapered and Limp mode gone as well. I thought it solved the issue, but I was wrong. Yesterday I've get the limp mode again, but this time no MIL on dash and no faults in error memory. I did some logs today and it seems, for some reasons something cuts rl_max at 100%, so throttle and boost is restricted. Funny thing is when I upload same software again up to 2-3 week is ok and then LIMP MODE returns. Have you had similar issue? I attach log from ME7Logger and modified dump. Log is useless as it's only showing a peak boost of 5psi! IE limp mode. I'm guessing it's going into limp from a boost deviation Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: alizczewy on March 23, 2017, 07:49:38 AM Log is useless as it's only showing a peak boost of 5psi! IE limp mode. I'm guessing it's going into limp from a boost deviation I wrote the car is in limp mode and there aren't any faults in memory already. Before car went into limp mode everything was fine and actual boost followed the desired. Another thing, If problem was caused by boost deviation I should have some fault related to this. By the way I modified KFDLULS and EDLDRP so boost deviations shouldn't cause a problem. The only way to back engine to normal operation is uplaoding the software again. Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: KasperH on March 23, 2017, 08:01:12 AM By the way I modified KFDLULS and EDLDRP so boost deviations shouldn't cause a problem. This why you don't get a fault code, you disabled boost deviation diagnosis.... What is the reason you disabled it? And if you're hitting limp you got a serious leak or something else is very wrong. Post some logs of car in non limp mode so we can see what causes it to go into limp mode. Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: _nameless on March 23, 2017, 08:19:17 AM you have 9 errors in your file. youre lucky your eeprom didnt give you the death code
Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: _nameless on March 23, 2017, 08:20:20 AM updated checksums ^
Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: alizczewy on March 23, 2017, 09:51:13 AM Thanks mate. I uploaded file with Kess, usually it calculate checksumes, but to make sure myself I'll double check them in ME7.x Correction
Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: nubcake on March 23, 2017, 11:36:44 AM I didn't look at the 367724 binary, but there's a rumor going around that it has some kind of additional tuning protection and that's why it encounters a limp mode after some time.
There are no such issues with 366304. Depending on how savvy you are with disassembly - it might be easier to just use a different base file. Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: AARDQ on March 23, 2017, 01:15:29 PM And would love to see a log when she's running well.
FWIW, I checksum using Nyet's tool and upload with MPPS. Works great. Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: alizczewy on March 23, 2017, 03:52:52 PM I didn't look at the 367724 binary, but there's a rumor going around that it has some kind of additional tuning protection and that's why it encounters a limp mode after some time. There are no such issues with 366304. Depending on how savvy you are with disassembly - it might be easier to just use a different base file. Big thanks mate, I was waiting for such directions. There have to be some kind of tuning protection in this software. I've never seen similiar problem in any ME7 based cars. This LIMP MODE it's not usual limp mode which we can reset by ignition recycle or battery disconnecting. Once ECU went in to this mode we can't do anything and the only working solution to switch it back to normal operation it is software update (it can be even same file). Now I'm almost sure it is not boost deviations problem. So today to make a logs in normal state without limp mode I had to upload the file again. Obviously like always after flashing the power came back. Unfortunately on the way to nice logging place, some clamp on the intercooler pipe slipped off and I had to go back without logs. Tomorrow I'm gonna sort it out and prepare another file based on 366304 version. Once it'll be done I let U know. good night Guys ;) Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: vwaudiguy on March 23, 2017, 05:21:32 PM The changes should be seen in the e2p I would think.
Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: alizczewy on March 23, 2017, 07:59:03 PM I'll read eeprom and if it'll happen again compare then
Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: prj on March 24, 2017, 02:26:59 AM This file has tuning protection, it's not a checksum problem.
Only way to get rid of that code is disable the tuning protection. Removing the class it will still go in limp mode after some time ;) So either flash old version without tuning protection or disable tuning protection in file. Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: KasperH on March 24, 2017, 08:16:20 AM I'm sorry to hijack a little here, but is there a way to check if there is tuning protection enabled in a file? And how to disable/circumvent it? Is it just CLAAATUN? :)
Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: alizczewy on March 26, 2017, 04:39:38 AM No CLAAATUN just hides a fault
Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: KasperH on March 26, 2017, 07:56:23 AM Yeah, figured that much. Can't really seem to find anything in the FR and the internet about it and how to disable it?
Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: prj on March 27, 2017, 11:43:17 PM Yeah, figured that much. Can't really seem to find anything in the FR and the internet about it and how to disable it? Sometimes you just have to use your brain and IDA.Also this stuff is obfuscated in ASM. Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: KasperH on March 28, 2017, 12:59:43 AM I have IDA pro installed, waiting for when some day in the distant future get my head around it :P
Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: nyet on July 27, 2019, 12:09:19 AM necro bump
prj et al any chance this is also in 368085 (558D)? http://nefariousmotorsports.com/forum/index.php?topic=16483.msg127581#msg127581 Even more, is there a chance you could be convinced to post a fix? If you haven't done the work perhaps I can make it worth your while. Title: Re: RS6 strange limp mode without fault codes. Boost reduction and Throttle cut Post by: prj on August 07, 2019, 01:03:04 PM Yeah 558D had it.
I am not sure I want to post the fix... |