2000 Audi TT 225 Roadster with multiple electrical issues

   #1  

adamrj

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Location
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VCDS Serial number
C?ID=214457
I've just bought a TT with some electrical issues. I'd be grateful for any advice which could help me narrow it down to which modules/wiring are causing issues.

The car has the following problems:

  • It was sold to me running fine until a hot start, then it wouldn't start until it had cooled down (no orange lights, engine turns over fine, just doesn't fire). Now it's hard to start, only runs for a little while and the EPC light is on.
  • I ran a diagnostic this morning (first scan) and engine temperature/RPM readings looked fine. I cleared error codes. Then a while later the engine died at around 90degC. Would not re-start.
  • Re-scanning, the Engine module had disappeared (see second scan).
  • Keyfobs don't work, Lock button in car works, unlock doesn't. This morning after pressing the lock button, the EPC light started flashing and there were clicks from under the dashboard in time with the flashing. This seems to tie in with the time the car started to lose the Engine module.
  • Fuel flap and boot work fine, windows don't drop on opening doors. Roof doesn't work, air break doesn't work but clicks once in one direction.
  • Rear window fell in a few weeks ago in hot weather. I guess it's possible the CCM got wet?
  • Clicking from diff with ignition on (this ties in with the Haldex data bus issue).
  • Stability light comes on intermittently while driving.

I think that's everything!

Any pointers very gratefully received.

Scans below:

Scan 1:
Code:
Sunday,25,August,2019,10:43:45:31354
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 19.6.1.0 (x64)  HEX-NET CB: 0.4508.4
Data version: 20190529 DS308.0
www.Ross-Tech.com


VIN:    License Plate: TT SCAN 1



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: XX (8N - Audi TT (1999 > 2007))
Scan: 01 02 03 08 15 17 22 35 37 45 55 56 76 77
 
VIN: XXXXXXXXXXXXXXXXX   
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06A-906-032-APX.clb
   Part No: 8L0 906 018 M
   Component: 1.8L R4/5VT         0002  
   Coding: 05710
   Shop #: WSC 06435  
   VCID: 393AD2442123E8879E-5118

3 Faults Found:
17834 - EVAP Purge Valve (N80) 
            P1426 - 35-00 - Open Circuit
17931 - Crash Signal from Airbag Controller 
            P1523 - 35-00 - Implausible Signal
16885 - Vehicle Speed Sensor 
            P0501 - 35-10 - Implausible Signal - Intermittent
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 8N0-907-379-MK20-E.clb
   Part No: 8N0 907 379 E
   Component: ESP     20    CAN  V005   
   Coding: 18446
   Shop #: WSC 06435  
   VCID: 3E30C158380DCFBFAB-4AE0

2 Faults Found:
01324 - Control Module for All Wheel Drive (J492) 
            49-00 - No Communications
01314 - Engine Control Module 
            49-10 - No Communications - Intermittent

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8N0-820-043.lbl
   Part No: 8N0 820 043 A
   Component: TT-KLIMAVOLLAUTOMAT D03  
   Coding: 00041
   Shop #: WSC 06435  
   VCID: 281C0700CA89610FF1-2580

1 Fault Found:
00792 - A/C Pressure Switch (F129) 
            31-00 - Open or Short to Ground

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8N8-909-601.lbl
   Part No: 8N8 909 601 
   Component: Airbag Front+Seite 1005  
   Coding: 10102
   Shop #: WSC 06435  
   VCID: 77BE147C57B73EF7A8-5118

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8Nx-920-xxx-17.lbl
   Part No: 8N2 920 930 C
   Component: KOMBI+WEGFAHRS. M73 D55  
   Coding: 06444
   Shop #: WSC 00469  
   VCID: 3228E568FC551BDF5F-4AE0
   XXXXXXXXXXXXXXXXX     AUZ5Z0C6116070

No fault code found.

-------------------------------------------------------------------------------
Address 22: AWD        Labels: 02D-900-554.lbl
   Part No: 02D 900 554 B
   Component: HALDEX LSC  ECC     0006  
   VCID: 1F0E1CDC9FC7A6B780-4AE0

3 Faults Found:
01312 - Powertrain Data Bus 
            37-00 - Faulty
01316 - ABS Control Module 
            49-10 - No Communications - Intermittent
01314 - Engine Control Module 
            49-10 - No Communications - Intermittent

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels:. 8Nx-962-267.lbl
   Part No: 8N7 962 267 B
   Component: Central Lock        D04  
   Coding: 04816
   Shop #: WSC 06314  
   VCID: 3FCEBC5C3F07C6B7A0-4EEA

4 Faults Found:
01366 - Opened Due to Crash Signal 
            35-00 - -
00955 - Key 1 
            09-10 - Adaptation Limit Surpassed - Intermittent
01559 - Drivers Door 
            61-00 - Won't De-Safe
01134 - Alarm Horn (H12) 
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 45: Inter. Monitor        Labels: 8E0-951-177.lbl
   Part No: 8N7 951 177 
   Component: Innenraumueberw.    D13  
   Coding: 00001
   Shop #: WSC 00000  
   VCID: 7BB6084C6B9F1A97CC-5160

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4B0-907-357-AUT.lbl
   Part No: 4B0 907 357 
   Component: LEUCHTWEITEREGLER  D003  
   Coding: 00010
   Shop #: WSC 06435  
   VCID: 65824E34FD1BBC670A-51CE

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8D0-035-1xx-56.lbl
   Part No: 4B0 035 186 
   Component:  Radio             0001  
   Coding: 00207
   Shop #: WSC 02324  
   VCID: 5DF266D4D54BF4A7D2-4AE0

1 Fault Found:
00852 - Loudspeaker(s); Front 
            36-00 - Open Circuit

End----------(Elapsed Time: 02:33, VBatt start/end: 13.7V/13.6V)-----------

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: XX (8N - Audi TT (1999 > 2007))
Scan: 01 02 03 08 15 17 22 35 37 45 55 56 76 77
 
VIN: XXXXXXXXXXXXXXXXX   
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06A-906-032-APX.clb
   Part No: 8L0 906 018 M
   Component: 1.8L R4/5VT         0002  
   Coding: 05710
   Shop #: WSC 06435  
   VCID: 393AD2442123E8879E-5118

3 Faults Found:
17834 - EVAP Purge Valve (N80) 
            P1426 - 35-00 - Open Circuit
17931 - Crash Signal from Airbag Controller 
            P1523 - 35-00 - Implausible Signal
16885 - Vehicle Speed Sensor 
            P0501 - 35-10 - Implausible Signal - Intermittent
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 8N0-907-379-MK20-E.clb
   Part No: 8N0 907 379 E
   Component: ESP     20    CAN  V005   
   Coding: 18446
   Shop #: WSC 06435  
   VCID: 3E30C158380DCFBFAB-4AE0

2 Faults Found:
01324 - Control Module for All Wheel Drive (J492) 
            49-00 - No Communications
01314 - Engine Control Module 
            49-10 - No Communications - Intermittent

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8N0-820-043.lbl
   Part No: 8N0 820 043 A
   Component: TT-KLIMAVOLLAUTOMAT D03  
   Coding: 00041
   Shop #: WSC 06435  
   VCID: 281C0700CA89610FF1-2580

1 Fault Found:
00792 - A/C Pressure Switch (F129) 
            31-00 - Open or Short to Ground

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8N8-909-601.lbl
   Part No: 8N8 909 601 
   Component: Airbag Front+Seite 1005  
   Coding: 10102
   Shop #: WSC 06435  
   VCID: 77BE147C57B73EF7A8-5118

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8Nx-920-xxx-17.lbl
   Part No: 8N2 920 930 C
   Component: KOMBI+WEGFAHRS. M73 D55  
   Coding: 06444
   Shop #: WSC 00469  
   VCID: 3228E568FC551BDF5F-4AE0
   XXXXXXXXXXXXXXXXX     AUZ5Z0C6116070

No fault code found.

-------------------------------------------------------------------------------
Address 22: AWD        Labels: 02D-900-554.lbl
   Part No: 02D 900 554 B
   Component: HALDEX LSC  ECC     0006  
   VCID: 1F0E1CDC9FC7A6B780-4AE0

1 Fault Found:
01312 - Powertrain Data Bus 
            37-00 - Faulty

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels:. 8Nx-962-267.lbl
   Part No: 8N7 962 267 B
   Component: Central Lock        D04  
   Coding: 04816
   Shop #: WSC 06314  
   VCID: 3FCEBC5C3F07C6B7A0-4EEA

5 Faults Found:
01366 - Opened Due to Crash Signal 
            35-00 - -
00955 - Key 1 
            09-10 - Adaptation Limit Surpassed - Intermittent
01559 - Drivers Door 
            59-00 - Can't Unlock
01559 - Drivers Door 
            61-00 - Won't De-Safe
01134 - Alarm Horn (H12) 
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 45: Inter. Monitor        Labels: 8E0-951-177.lbl
   Part No: 8N7 951 177 
   Component: Innenraumueberw.    D13  
   Coding: 00001
   Shop #: WSC 00000  
   VCID: 7BB6084C6B9F1A97CC-5160

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4B0-907-357-AUT.lbl
   Part No: 4B0 907 357 
   Component: LEUCHTWEITEREGLER  D003  
   Coding: 00010
   Shop #: WSC 06435  
   VCID: 65824E34FD1BBC670A-51A8

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8D0-035-1xx-56.lbl
   Part No: 4B0 035 186 
   Component:  Radio             0001  
   Coding: 00207
   Shop #: WSC 02324  
   VCID: 5DF266D4D54BF4A7D2-4AE0

1 Fault Found:
00852 - Loudspeaker(s); Front 
            36-00 - Open Circuit

End----------(Elapsed Time: 02:33, VBatt start/end: 12.3V/12.3V)-----------
Scan 2:
Code:
Sunday,25,August,2019,12:34:16:31354
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 19.6.1.0 (x64)  HEX-NET CB: 0.4508.4
Data version: 20190529 DS308.0
www.Ross-Tech.com


VIN:    License Plate: TT SCAN 2



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: XX (8N - Audi TT (1999 > 2007))
Scan: 01 02 03 08 15 17 22 35 37 45 55 56 76 77
 
VIN: XXXXXXXXXXXXXXXXX   
-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 8N0-907-379-MK20-E.clb
   Part No: 8N0 907 379 E
   Component: ESP     20    CAN  V005   
   Coding: 18446
   Shop #: WSC 06435  
   VCID: 3E30C158380DCFBFAB-4AE0

2 Faults Found:
01314 - Engine Control Module 
            49-00 - No Communications
01324 - Control Module for All Wheel Drive (J492) 
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8N0-820-043.lbl
   Part No: 8N0 820 043 A
   Component: TT-KLIMAVOLLAUTOMAT D03  
   Coding: 00041
   Shop #: WSC 06435  
   VCID: 281C0700CA89610FF1-2580

1 Fault Found:
00792 - A/C Pressure Switch (F129) 
            31-00 - Open or Short to Ground

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8N8-909-601.lbl
   Part No: 8N8 909 601 
   Component: Airbag Front+Seite 1005  
   Coding: 10102
   Shop #: WSC 06435  
   VCID: 77BE147C57B73EF7A8-5118

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8Nx-920-xxx-17.lbl
   Part No: 8N2 920 930 C
   Component: KOMBI+WEGFAHRS. M73 D55  
   Coding: 06444
   Shop #: WSC 00469  
   VCID: 3228E568FC551BDF5F-4B00
   XXXXXXXXXXXXXXXXX     AUZ5Z0C6116070

No fault code found.

-------------------------------------------------------------------------------
Address 22: AWD        Labels: 02D-900-554.lbl
   Part No: 02D 900 554 B
   Component: HALDEX LSC  ECC     0006  
   VCID: 1F0E1CDC9FC7A6B780-4B00

1 Fault Found:
01312 - Powertrain Data Bus 
            37-00 - Faulty

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels:. 8Nx-962-267.lbl
   Part No: 8N7 962 267 B
   Component: Central Lock        D04  
   Coding: 04816
   Shop #: WSC 06314  
   VCID: 3FCEBC5C3F07C6B7A0-4EC8

5 Faults Found:
01366 - Opened Due to Crash Signal 
            35-00 - -
00955 - Key 1 
            09-10 - Adaptation Limit Surpassed - Intermittent
01559 - Drivers Door 
            59-00 - Can't Unlock
01559 - Drivers Door 
            61-00 - Won't De-Safe
01134 - Alarm Horn (H12) 
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 45: Inter. Monitor        Labels: 8E0-951-177.lbl
   Part No: 8N7 951 177 
   Component: Innenraumueberw.    D13  
   Coding: 00001
   Shop #: WSC 00000  
   VCID: 7BB6084C6B9F1A97CC-5160

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4B0-907-357-AUT.lbl
   Part No: 4B0 907 357 
   Component: LEUCHTWEITEREGLER  D003  
   Coding: 00010
   Shop #: WSC 06435  
   VCID: 65824E34FD1BBC670A-51A8

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8D0-035-1xx-56.lbl
   Part No: 4B0 035 186 
   Component:  Radio             0001  
   Coding: 00207
   Shop #: WSC 02324  
   VCID: 5DF266D4D54BF4A7D2-4AE0

1 Fault Found:
00852 - Loudspeaker(s); Front 
            36-00 - Open Circuit

End----------(Elapsed Time: 02:36, VBatt start/end: 12.4V/12.4V)-----------
 
   #2  

Jack@European_Parts

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Start with the N80 outputs performed with VCDS replacement and checking wiring using WD via RTFB, no?
 
   #3  

Uwe

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It was sold to me running fine until a hot start, then it wouldn't start until it had cooled down (no orange lights, engine turns over fine, just doesn't fire). Now it's hard to start, only runs for a little while and the EPC light is on.
Sounds like vapor lock?

But in your second scan, the ECU isn't responding....

-Uwe-
 
   #4  

Jack@European_Parts

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If the N80 is stuck open it will cause air leaks and in some cases suck raw fuel during residual vacuum causing a flooded sump or cylinder condition, no?
EPC light could be for many reasons?

Have you tried crimp tests for EVAP & LDP and verified all intake zones in addition to FP relay and output of FP + FPR function.

Have you unplugged OXS sensors and verified wiring to isolate shorts with load light?

Verify MAF
 
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   #5  

adamrj

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OK, so I finally got back onto this today. Turns out that the N80 had been disconnected for some reason. I've reconnected it and am not getting that error now. There was no earth strap on the rear diff (and no sign of one ever being there) so I've attached one. I ran the car up to temperature and everything seemed to be going well. I stopped it a couple of times and re-started it successfully. Then I tried operating the hood switch (ignition on, engine not running). There was a rapid clicking noise from under the dash in time with the EPC light flashing, and after that the car wouldn't start. I did a scan and the engine module was only intermittently visible. Also the Haldex Powertrain Data Bus error which had cleared, reappeared.

I left the car about 20 minutes, then it restarted fine. I haven't conclusively worked out a pattern yet, but at some point, generally when it's up to temperature, something is failing and causing the car not to start.
 
   #6  

Jack@European_Parts

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Joined
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8,811
Location
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VCDS Serial number
C?ID=57337
OK, so I finally got back onto this today. Turns out that the N80 had been disconnected for some reason. I've reconnected it and am not getting that error now. There was no earth strap on the rear diff (and no sign of one ever being there) so I've attached one. I ran the car up to temperature and everything seemed to be going well. I stopped it a couple of times and re-started it successfully. Then I tried operating the hood switch (ignition on, engine not running). There was a rapid clicking noise from under the dash in time with the EPC light flashing, and after that the car wouldn't start. I did a scan and the engine module was only intermittently visible. Also the Haldex Powertrain Data Bus error which had cleared, reappeared.

I left the car about 20 minutes, then it restarted fine. I haven't conclusively worked out a pattern yet, but at some point, generally when it's up to temperature, something is failing and causing the car not to start.
17834 - EVAP Purge Valve (N80)
P1426 - 35-00 - Open Circuit
Yay.............
 
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