Audi TT MK1 flipping fuel gauge reading code

   #1  

CentrIL

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This is probably not the best location for this, and I will repost in tweaks or code sections later when I'm verified.
My TT 225 coupe was made after 05/2002 and has the appropriate fuel sending units that read ~280 ohm as empty and ~50 ohms as full. Unfortunately a previous owner installed one of the faulty instrument clusters made for post 5/2002 cars but has a fuel gauge programmed for sending units through 05/2002 (50ohm=empty 280ohm=full). The fuel gauge and distance to empty display read exactly opposite of what they should. I did replace the faulty fuel gauge motor in that cluster and it passes the output test without issue. Is it possible to change the code on my current cluster to correct fuel gauge and distance to empty? Should I swap both sending units to the earlier sending units that should make the fuel gauge read correctly? I have purchased a used cluster and wasted a VIN registration to check its gauge output test and the fuel gauge appears to work and work appropriately with my sending units. Would it be best to go through getting the PINs for both clusters and swapping out the clusters along with reprogramming keys etc?

Code:
Monday,02,September,2019,15:47:34:34367
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64
VCDS Version: 19.6.1.0 (x64)  HEX-V2 CB: 0.4508.4
Data version: 20190529 DS308.0
www.Ross-Tech.com


VIN: TRUWT28N321036393   License Plate: 


Chassis Type: 8N (8N - Audi TT (1999 > 2007))
Scan: 01 02 03 08 15 17 22 35 37 45 55 56 76 77
 
VIN: TRUWT28N321036393   
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06A-906-032-AMU.lbl
   Part No: 8N0 906 018 AN
   Component: 1.8L R4/5VT     G   0004  
   Coding: 06710
   Shop #: WSC 79155  
   VCID: 7DA7F87D04E90D1FA1F-513C
   TRUWT28N321036393     AUZ5Z0B5255169

3 Faults Found:
17978 - Engine Start Blocked by Immobilizer 
            P1570 - 35-10 -  - Intermittent
18010 - Power Supply Terminal 30 
            P1602 - 35-10 - Voltage too Low - Intermittent
16795 - Secondary Air Injection System 
            P0411 - 35-10 - Incorrect Flow Detected - Intermittent
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 8N0-907-379-MK60-A.lbl
   Part No: 8N0 907 379 H
   Component: ESP ALLRAD MK60     0101  
   Coding: 0022544
   Shop #: WSC 01236 785 00200
   VCID: 41DF448D3D91A9FF857-513C

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8N0-820-043.lbl
   Part No: 8N0 820 043 A
   Component: TT-KLIMAVOLLAUTOMAT D03  
   Coding: 00140
   Shop #: WSC 01236  
   VCID: 2809F929BBEB78B7A29-2580

1 Fault Found:
00604 - Potentiometer Positioning Motor for Air Flow Flap (G113) 
            30-10 - Open or Short to Plus - Intermittent

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8N0-959-655.lbl
   Part No: 8N0 959 655 A
   Component: Airbag Front+Seite 5000  
   Coding: 01103
   Shop #: WSC 01236  
   VCID: 3E253F71496FD607F85-513C

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8Nx-920-xxx-17.lbl
   Part No: 8N1 920 980 E
   Component: KOMBI+WEGFAHRS. M73 D14  
   Coding: 07244
   Shop #: WSC 14236  
   VCID: 382929696B4BE837329-4B00
   TRUWT28N321036393     AUZ5Z0B5255169

No fault code found.

-------------------------------------------------------------------------------
Address 22: AWD        Labels: 02D-900-554.lbl
   Part No: 02D 900 554 C
   Component: HALDEX LSC  ECC     0010  
   VCID: 2019E109D3DB80F7EA9-4B00

1 Fault Found:
00526 - Brake Light Switch (F) 
            27-00 - Implausible Signal

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels:. 8Nx-962-267.lbl
   Part No: 8N8 962 267 A
   Component: Central Lock/Alarm  D06  
   Coding: 15980
   Shop #: WSC 42402  
   VCID: 3FDB42754E65DF0FF33-4F0C

3 Faults Found:
01616 - Signal Wire to Interior Monitor 
            36-10 - Open Circuit - Intermittent
00957 - Key 3 
            09-10 - Adaptation Limit Surpassed - Intermittent
01560 - Passenger Door 
            59-00 - Can't Unlock

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4B0-907-357-AUT.lbl
   Part No: 4B0 907 357 
   Component: LEUCHTWEITEREGLER  D004  
   Coding: 00010
   Shop #: WSC 01236  
   VCID: 6597B01D8C79A5DF59F-5160

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8E0-035-1xx-56.lbl
   Part No: 4B0 035 186 H
   Component: concert II  NP2    0007   
   Coding: 00302
   Shop #: WSC 00000  
   VCID: 2517F01DCCF965DF99F-4E20

1 Fault Found:
01336 - Company Data Bus for Comfort System 
            49-10 - No Communications - Intermittent

End----(Elapsed Time: 02:47, VBatt start/end: 11.7V/11.7V. VIgn 11.6V)-----
 
   #2  

Uwe

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Got you verified, but please don't re-post. I'm not exactly sure where this belongs either.

I don't think this can be fixed via coding or adaptation. Perhaps by tweaking the EEPROM data in the cluster directly, but that's not something you can do with VCDS, and it would require intimate knowledge of data layout in any case.

As to whether it's best to fit senders that match the cluster, or a cluster that matches the senders, I have no strong opinion, but my gut says: Use the part that's supposed to be in this car.

-Uwe-
 
   #3  

CentrIL

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Thanks Uwe, makes sense why I wasn’t finding anything more about the topic than people warning about the issue. I agree on parts that were used in the car, and that is why I bought the cluster and not sending units. Unfortunately fixing other people’s attempts to repair or modify is far more daunting than being the first guy who thinks he knows what he is doing.

I look forward to participating and perusing in this forum. Thanks for all your time and efforts.

-Dan
 
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