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Thread: 2003 Audi RS6 ECU checksum error / inability to activate ABS bleed procedure

  1. #1
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    2003 Audi RS6 ECU checksum error / inability to activate ABS bleed procedure

    When i use the VCDS to scan the car engine module i inevitably get the following error which returns immediately upon clearing:

    16985 - Internal Control Module
    P0601 - 001 - Memory Check Sum Error - MIL ON

    first of all - my MIL won't ever illuminate. i suspect this is due to the MTM chip installed as i do recall seeing it when the stock chip is returned and key in ignition. However, the error remains even when stock chip is re-installed.

    my question is twofold - is there a way to fix this error short of a new/refurb. ECU (i.e. can it be repaired by myself?), and also, would this error prevent me from cycling the ABS bleed procedure?

    when i try to start the ABS procedure with the 'start' button in output tests, it just does nothing and forces me to hit 'done'. the ABS system has no errors, it's 5.7 and the system operates fine. i've tried the generic login and also the soft codes version. Neither avenue helps in activating the ABS pump. Nor did trying to activate it w/ brake pedal depressed or car running.

    I can run the test just fine on my audi a6 2000 with the same cable and laptop, so i don't think they're the problem.

    Any/all insight greatly appreciated. i think i have a pretty good grasp of the car as i've removed the engine (twice...), replaced fuel tank, rebuilt the turbos, alternator, replaced an intake valve and master cylinder amongst other frustrating procedures. So don't hesitate to suggest solutions that seems too deep in the weeds, although simple solutions are obviously preferred. ;-)

  2. #2
    Benevolent Dictator Uwe's Avatar
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    I would imagine there are people who could probably fix that, but I don't visualize it as a DIY project.

    Where are you seeing a bleed procedure for this ABS that calls for the use of a scan-tool?

    We generally appreciate users posting a complete Auto-Scan, which often contains valuable context.

    -Uwe-
    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

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  4. #3
    Professional User Jetta ,97's Avatar
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    Quote Originally Posted by cullenvb View Post
    When i use the VCDS to scan the car engine module i inevitably get the following error which returns immediately upon clearing:

    16985 - Internal Control Module
    P0601 - 001 - Memory Check Sum Error - MIL ON

    first of all - my MIL won't ever illuminate. i suspect this is due to the MTM chip installed as i do recall seeing it when the stock chip is returned and key in ignition. However, the error remains even when stock chip is re-installed.

    my question is twofold - is there a way to fix this error short of a new/refurb. ECU (i.e. can it be repaired by myself?), and also, would this error prevent me from cycling the ABS bleed procedure?

    when i try to start the ABS procedure with the 'start' button in output tests, it just does nothing and forces me to hit 'done'. the ABS system has no errors, it's 5.7 and the system operates fine. i've tried the generic login and also the soft codes version. Neither avenue helps in activating the ABS pump. Nor did trying to activate it w/ brake pedal depressed or car running.

    I can run the test just fine on my audi a6 2000 with the same cable and laptop, so i don't think they're the problem.

    Any/all insight greatly appreciated. i think i have a pretty good grasp of the car as i've removed the engine (twice...), replaced fuel tank, rebuilt the turbos, alternator, replaced an intake valve and master cylinder amongst other frustrating procedures. So don't hesitate to suggest solutions that seems too deep in the weeds, although simple solutions are obviously preferred. ;-)
    Most likely your problem with ECU internal fault is you MTM chip.Second hand ECU can be install , but If you put used ECU , it has to be programed , it is not plug and play.
    Is the chip mounted in ECU our like plug to ECU harness?

    For ABS like UWE said post autoscan .

    Out of curiosity , why you want to bled your brakes if your working good like you mention?
    Master Technician for German cars
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  6. #4
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    Code:
    Friday,04,May,2018,12:25:37:35104
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 18.2.0.3 (x64)  HEX-V2 CB: 0.4411.4
    Data version: 20180212 DS287.0
    www.Ross-Tech.com
    
    
    VIN: WUAPV64B63N904881   License Plate: 
    
    
    Chassis Type: 4B (4B - Audi A6/S6/RS6/allroad C5 (1998 > 2005))
    Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
              75 76 77
     
    VIN: WUAPV64B63N904881   
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 077-907-558-BCY.lbl
       Part No: 4D1 907 558 D
       Component: 4.2l V8/5VT     G   0003  
       Coding: 0006752
       Shop #: WSC 00000 785 00200
       VCID: 2F381A73AB05DE7FDB2-5160
    
    1 Fault Found:
    16985 - Internal Control Module 
                P0601 - 001 - Memory Check Sum Error - MIL ON
    Readiness: 0000 0000
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans        Labels: 01L-927-156.lbl
       Part No: 4B0 927 156 FL
       Component: AG5 01L 4.2l5VT USA 0305  
       Coding: 0000002
       Shop #: WSC 00000 785 00200
       VCID: 76B6EF1714DFAFB7584-5160
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 4B0-614-517.lbl
       Part No: 4B0 614 517 AD
       Component: ESP 5.7 RS 6        2310  
       Coding: 06697
       Shop #: WSC 12345  
       VCID: 6390A643B24D2A1F0FA-51F2
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 06: Seat Mem. Pass        Labels: None
       Part No: 4B0 959 760 C
       Component: Sitzmemory R1 BF    0205  
       Coding: 00003
       Shop #: WSC 00000  
       VCID: 2D04007BA439AC6FE9E-4AE0
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 4B0-820-043-MY2.lbl
       Part No: 4B0 820 043 AR
       Component: A6-Klimavollautomat 0208  
       Coding: 00010
       Shop #: WSC 00000  
       VCID: 6A8ECB6755577B57CCC-2580
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 4B0-959-655-AI84.lbl
       Part No: 4B0 959 655 Q
       Component: Airbag 8.4EP        3001  
       Coding: 0000607
       Shop #: WSC 00000 785 00200
       VCID: 3E2637377C6F27F7404-5184
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 4B0-920-xxx-17.lbl
       Part No: 4B0 920 983 D
       Component: KOMBI+WEGFAHRS. VDO D13  
       Coding: 03284
       Shop #: WSC 02301  
       VCID: 290CF46B90E1B04F056-5160
       WUAPV64B63N904881     AUZ7Z0C2409246
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 35: Centr. Locks        Labels:. 4B0-962-258.lbl
       Part No: 4B0 962 258 M
       Component: Central Lock/Alarm  D38  
       Coding: 15885
       Shop #: WSC 00000  
       VCID: 33301603421DFA9FBFA-4EEA
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 36: Seat Mem. Drvr        Labels: None
       Part No: 4B0 959 760 B
       Component: Sitzmemory R1 F     0204  
       Coding: 00001
       Shop #: WSC 00000  
       VCID: 2C020D7F9F23A567FE0-4AE0
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 55: Headlight Range        Labels: 4Z7-907-357.lbl
       Part No: 4Z7 907 357 
       Component: dynamische LWR       D09  
       Coding: 00050
       Shop #: WSC 00000  
       VCID: 045285DF57338D27560-4B00
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 56: Radio        Labels: 8E0-035-1xx-56.lbl
       Part No: 4B0 035 195 N
       Component: symphony II NP2    0260   
       Coding: 00221
       Shop #: WSC 67840  
       VCID: 2B000E639A2DA25FF7A-4FFC
    
    2 Faults Found:
    01303 - Telephone Transceiver (R36) 
                49-00 - No Communications
    00858 - Connection; Radio Intermediate Frequency (IF) Output to Antenna Amplifier 
                36-00 - Open Circuit
    
    -------------------------------------------------------------------------------
    Address 76: Park Assist        Labels: 8Z0-919-283.lbl
       Part No: 8Z0 919 283 
       Component: Parkingsyst. A6 RDW D08  
       Coding: 01116
       Shop #: WSC 00000  
       VCID: 025E83C74D27831764C-513C
    
    No fault code found.
    
    End----------(Elapsed Time: 04:33, VBatt start/end: 12.3V/12.2V)-----------
    Last edited by Uwe; 05-04-2018 at 01:07 PM. Reason: CODE tags

  7. #5
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    I had a brake pedal that would fall to the floor if pushed with enough effort. I solved the problem - which i'll discuss in another post as it may help others in my situation - but until then I had assumed there was air in the ABS pump/module.

    so, for the bleeding procedure that calls for a scan tool I went to ABS brakes (3), output tests (3), and start/next. as soon as I hit that button I get output test sequence complete. there is no activation of the ABS pump whatsoever. thanks!

  8. #6
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    You may be right w/ the internal fault source, but i did ship the ECU to the original installer who bench-tested it. he found the chip slightly dislodged, but otherwise it passed his tests - for whatever that's worth. he then returned the ECU to me along w/ the OE chip. that's why i said when i swapped chips and continued to see the check sum error i felt it was the ECU at fault. the chip is mounted onto the ECU board's pins, not plugged into the harness, if that helps.

    brakes are working well now solely b/c of the recent bleedings. over the course of 2-3 years the brakes got new pads/rotors, new brake lines and i put in a new master cylinder. so obviously i introduced air into the system. long story short, the solution i found was to retract the pistons fully then power bleed. i had bubbles hanging out within the calipers' piston bores. This was hugely magnified due to fact the front calipers have 8 pistons each. So now with the vacuum assist purged post-shut off, the pedal play is limited to the movement within the brake booster itself and not much more.

    until i discovered this trick myself, i had been resigned to thinking air must be within the ABS pump and because i couldn't activate it i was going to have to live with it. thanks.

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  10. #7
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    Hello , if I am right this car has ME 7.1.1. ecu. This dtc I saw several times on remapped me 7.1.1 cars. But mostly a tuner can fix it. But it's really strange that the problem remains when ecu is put back to stock.

    As far as I know the mil lamp on does not affect driveability of the car, but when light is always on, you won't notice other issues.

    Best regards

    John

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  12. #8
    NostraJackAss Jack@European_Parts's Avatar
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    I can tell you what........... I have brand new RS6 ECU's...in the factory box & reman ..........

    https://www.ebay.com/itm/AUDI-03-04-...MAAOSw0JpV5J5f

    I highly recommend getting one of these though if playing real RS6.....

    http://www.bosch-motorsport.de/media...2775343627.pdf
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    Specializing in Custom Services IE: "welding-fabrication" / EPA-SMOG Update or Pass-Thru-Programming / Data Transfer / Immobilizers & OEM Quality Parts
    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
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  14. #9
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    thank you John. i believe you are correct ME 7.1.1. i mailed the tuner my ecu with the MTM chip (after i noticed the Check sum error) and he was unable to see the error, which confounds me.

    As for the MIL lamp, it's not so much drivability, it's the fact it NEVER comes on - even when a scan shows a code indicating "MIL on". Nor does it appear when i initially inset the key before start-up. Yet i know the MIL lamp itself works as it does briefly show up on start-up w/ the stock chip reinstalled. So is this a known manifestation of the MTM chip mod? In hindsight i'm led to believe MTM was not the best choice for chipping the RS6, but i'm not about to cry about spilt milk.

    Is there a definitive answer in terms of the repairability of the ecu (via flashing?)? And if the answer is that i'll need another ECU, is that a simple plug and play or is there a dealer intervention necessary?

  15. #10
    Professional User Jetta ,97's Avatar
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    Quote Originally Posted by cullenvb View Post
    Is there a definitive answer in terms of the repairability of the ecu (via flashing?)? And if the answer is that i'll need another ECU, is that a simple plug and play or is there a dealer intervention necessary?
    I gave you answer in Post #3,
    no it is not plug and play. But do not need to go to dealer . I can do programing if you need it.
    Also it does not have to be new ECU, you can get used ECU as well and it can be programed.
    Master Technician for German cars
    Immobilizer/ECU
    /Cluster Programing (Used or NEW) and Key Programing
    Mk6 COLOR cluster in Mk5 -CLIK

    email : marinmm2001@gmail.com

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