NefMoto

Hello,

So i've been hitting this error code for about 3 months when I slowly accelerate in 2nd gear and I hit 3800-4000 rpm the car stalls right away and goes into limp mode with MIL.
If I restart the engine the MIL goes away but the intermittent code stay until I clear it with VAG-COM.
I did not get this error code previously so I tought something might have broken in the car.

According to http://wiki.ross-tech.com/wiki/index.php/17743/P1335 there can be several things that can cause this, so I did the following:
- Intake hose(s) or intake system leaks (Unmetered Air) after MAF == NO LEAKS
- Mass Air Flow Sensor (G70) faulty (replaced it with a brand new one)
- Engine Coolant Temperature sensor faulty (replaced it with a brand new one)
- Restricted Air or Fuel Filters (cleaned out my K&N filter and replaced fuel filter)

The only thing I did not do is to check the Check Intake Air Temperature sensor because according to VAG-COM the temperature values seemed sane for me. The only thing that changed since summer when I did not get this code is that now it's kinda humid and cold outside (- 5-8 C).

THe other thing is that I do not get this error when i am doing 100% TPS, where according to my vag-com logs I get up to 499nm. The max specified torque specified by ASR is 599.9.
Why the hell does it think that I exceed that by doing 50% TPS in 2nd gear.

The car is a S4 B5 (2000.05 from Switzerland) has RS4 K04 turbos, 85mm MAF, a high flow fuel pump, stock injectors and stock FPR.
Initially it came with a D-box but I managed to get parts from a crashed S4 from the UK which was running the above setup.
Unfortunately that car had an encrypted chip on an A-box, without any pointers to it's actual tuners, so if it is a software problem, I can't really fix that, unless I flash an M-box flash to my D-box (which works fine), but I don't really want to loose the tune I have because I don't feel confident enough to start out with my own tune.
I have basically no other issues with this ECU it pulls as hard as it should, unless I do half-throttle in 2nd gear. It does not happen in any other gears.

So does anyone have any idea what can cause this issue? I would be happy to do logging as much as needed, and I would really appriciate if someone could give me some pointers.

Thank you guys!

Oh and there are no boost leaks either.

It could be a tuning problem: http://nefariousmotorsports.com/forum/index.php?topic=1371.msg14368#msg14368

Yes that would make sense, but I did not get this error before and my driving habits did not change :)

KFMIZUFIL -> FFs
KFMIZUOF -> 00s
KFMIZUNS -> FFs
KFMI_UM -> updated to reflect KFMIOP
KFMPNS_UM -> FFs
KFMDZOF_UM -> FFs
KFMPED_UM -> FFS

Try these! :) Just in case...

The problem is, that I can't modify the chip. What can cause this outside of a software limitation?

Let me say again, the car was running fine until end of 2011. I only got this starting last month, so it has to be either environment related or some faulty component.

It can be environment related, maybe colder air gave you bigger torque (for example with KFTARX). You'll have to find some way to edit maps and try it and if it doesn't work then you have a bad component

Since I have a D box I can flash an M firmware onto it, but unfortunately I haven't found one for my setup yet that i can start out with.

Have you opened your ECU to verify what's going on inside? I mean, it may have an encryption chip, or maybe not. Bench flash, boot mode? I assume you tried to read with Nefmoto software? I'm a pretty big fan of starting fresh and learning to tune, but with your situation you really can't. Maybe you could pay one of the better known tuners on here to at least get your car running and then tune from there? Sounds like a software issue to me, but I am definitely not a pro.

I've taken it to a guy who had the equipment to read the flash and now I am trying to get the actual file from him, but he told me that the maps are swapped so I guess it would be useless anyways.

Sure they're swapped, but they still "look" the same. The addresses can't be switched all that far, and to avoid the problem your having you only need a few maps changed anyway. Again, I'm still a fan of DIY tune, for all we know, you may have a shit tune, but at least your car would run while you worked on your own tune, if that's what you decided to do.  :)

Oh i got this lovely code back with berttos' and tony's stage 3 file as well after we got a 10 celsius drop in temperature during the day 27 celsius vs 17 celsius with some rain and more humidity so i guess that the weather actually makes a difference in this case. I havent tried zeroing the suggested maps yet because i would really love to actually understand this problem better. Is it possible that the long term fuel trims were adjusted to the warmer weather and the sudden drop actually f**ked things up? Thanks in advance for the input!

So berTTos' stage 3 file has KFTARX flattened to 1.0 from -20.25 till 20.25 degC and for there it is going down from 1.0 to 0.8 at 6000 rpm and 120 degC.
This is slightly different from the stock KFTARX since that has a 0.96 at around 17 degC so I guess at that point less boost would occur?

Thanks

I've done some logging today with VAG-COM because I could not get ME7Logger working yet.

The CSV is available at https://docs.google.com/spreadsheet/ccc?key=0AhrG40GHpr-hdG9DdzJTMVNZTm0wTWgwQTlRR1dBX0E

You can see that at row 322 I switched to 3rd gear and tried to pull away with about 25% of TPS and at row 327 I got dumped into LIMP mode with the usual control limit exceeded DTC.

I already told what to do earlier. You have to disable monitor2.

That's what I am doing right now, but I would like to understand the root cause of the problem, I know that there is a workaround for this but I find it strange that 90% of the tuned cars out there don't produce this DTC while the others do, some even mention that it is more common on cars manufactured in 2000, which sounds bullsh** but still :)
I also would like to know what can actually go wrong if the ECU is not going into limp mode because monitoring is disabled.

Thanks

Ok well that partly-bricked my ECU. Car starts up, but shuts down about 5 seconds later while the idle is dropping up and down. The NefMoto flasher can't connect anymore nor VAG-COM and the EPC light is blinking.
I've doubled checked the file I flashed the ME7Checker says it's OK! I guess I will have to bench flash it ..

masterj, can you please look at the file which flashed fine but prevents re-flashing and causes EPC blinking?
it is available at http://blade2k.humppa.hu/failed_torque_disable.bin
I would love to know what broke it.

Ok the ECU is live again after bench-flashing, now i gotta figure out what's the problem with the file :(

Are you 100% sure that your map definitions are correct?

I am using nyet's XDF so I assume they are correct.

Give me original file bin I'll try to help you... P.S> write addresses of kfmiop/kfmirl and all the others that I wrote to edit... (I'm using winols so I can't open xdf)

Okay so here are the addresses:

KFMIZUFIL @ 0x11599
KFMIZUOF @ 0x11619
KFMIZUNS @ 0x115D9
KFMI_UM @ 0x14098
KFMPNS_UM @ 0x141A9
KFMDZOF_UM @ 0x14129
KFMPED_UM @ 0x14169

The original bin is available here: http://blade2k.humppa.hu/8D0907551M_dekaIV.bin

The failed bin file is: http://blade2k.humppa.hu/failed_torque_disable.bin

This way you can probably compare it.

Thank you!

Oh btw on the original file which is based on berttos' tune KFMIZUFIL is FF all the way already.

Exactly. I'm not a fan of doing all the 00 0xff crap people are just blindly telling you to do.. but it is all you can do unless you are willing to do a bit of legwork with ME7L and the FR....

For example, like I did here...

http://nefariousmotorsports.com/forum/index.php?topic=1905.0

Sure, once I get ME7L working because I can't get it to connect to my ECU with none of the connection methods it supports.

The problem is you are modifying maps outside of what your tool will checksum, it is likely one of the *****_UM maps. This checksum failure causes the ECU to run and cycle the throttle body, with out the ability to be reflashed.

try it

Oh that makes sense, so I guess the MTX tuner-pro checksum plugin cannot handle it. I guess I should contact them so that they can look into the issue.
I will try your file as soon my galetto cable arrives so I can revive the ECU if needed. Is it going to be possible to modify your file (other maps than the *_UM ones) safely without freaking out the ECU again with a wrong checksum?

Thanks

Well, I'm using WinOls so I've fixed my chechksums, but if you modify maps again then you might experience same thing

Well i guess i will have to try and error ;) On the other hand i will look into the me 7 doc to see what isbactually causing this dtc.

I've managed to do some logging today (https://docs.google.com/spreadsheet/ccc?key=0AhrG40GHpr-hdDhzdEkyWllmRGkwLUR6czBaRGo5dnc#gid=0)
and it seems that i get into limp mode with torque monitor 2 when my IgnReatrdKnockControl (wkr_1-6) gets below zero.

Every tuned car is experiencing small knock unless you have very retarted timing... And that shouldn't put you into limp... Look for different factors

Ok so a negative value is okay there, i though it should only be positive.

Retarding spark means negative numbers ;) It only occurs when knock sensor pick up knock

ok now it makes sense  ;D

You're nowhere NEAR logging anything that causes torque intervention.

Well I did some logging again with way more info and it seems that my EngineLoad is higher than EngineLoadRequested for a long enough time to cause the intervention. It happens right at the end of the logfile before I shut the engine down. Any ideas?
Thanks

Did you check s4wiki? There are lots of references to the various torque monitoring threads/messages here.