'09 Touareg 3.0 TDI sudden limp mode, man code. Help please.

   #1  

MmmBoost

Verified VCDS User
Verified
Joined
Aug 4, 2017
Messages
14
Reaction score
2
Location
Canada
VCDS Serial number
C?ID=211202
Hi everyone, I'm currently verified but for some reason unable to post in the Car Repair forum. I was hoping to get some help ASAP before I pull my hair out and end up taking this beast into the Stealership.


Some context, I was driving to work last week....my Touareg started fine, drove fine, etc until about 5 mins into my drive it just lost all power and got a flashing check engine and a flashing glow plug light and it said "Workshop Fault"

I limped it home and scanned it, but I only scanned the 01 Engine module and came up with these codes...

Code:
Tuesday,06,June,2017,21:57:49:25857
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x86
VCDS Version: 15.7.4.1
Data version: 20160216
www.Ross-Tech.com


Mileage: 198978   Repair Order: 



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


                Address 01: Engine       Labels: 059-907-401-CAT1.clb
Control Module Part Number: 7L0 907 401 K    HW: 7L0 907 401 K
  Component and/or Version: 3.0TDI EDC17G104AG  0100
           Software Coding: 0421002A590F0968
            Work Shop Code: WSC 91429 999 59371
                      VCID: 3365111B515069A6B3-5106
3 Faults Found:

001617 - Sensor Reference Voltage B 
               P0651 - 000 - Open Circuit - MIL ON
             Freeze Frame:
                    Fault Status: 11100000
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 198972 km
                    Time Indication: 0
                    Date: 2017.07.25
                    Time: 07:37:10

             Freeze Frame:
                    RPM: 2310 /min
                    Speed: 32.5 km/h
                    Voltage: 14.29 V
                    Load: 35.7 %
                    Torque: 448.5 Nm
                    Bin. Bits: 00000011
                    Bin. Bits: 00000001

008266 - Reductant Pressure Sensor Circuit 
               P204A - 000 - Electrical Malfunction - MIL ON
             Freeze Frame:
                    Fault Status: 11100000
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 198972 km
                    Time Indication: 0
                    Date: 2017.07.25
                    Time: 07:37:10

             Freeze Frame:
                    RPM: 1596 /min
                    Voltage: 14.44 V
                    Load: 78.4 %
                    Temperature: 11.7°C
                        2.6 bar
                    Temperature: 13.5°C

008487 - Accelerator Position Sensor 2 (G185) 
               P2127 - 000 - Signal too Low - MIL ON
             Freeze Frame:
                    Fault Status: 11100000
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 198972 km
                    Time Indication: 0
                    Date: 2017.07.25
                    Time: 07:38:01

             Freeze Frame:
                    RPM: 0 /min
                    Speed: 0.0 km/h
                    Voltage: 12.46 V
                    Load: 0.0 %
                    Bin. Bits: 00000000
                    Voltage: 0.720 V
                    Voltage: 0.000 V


Readiness: 1 2 0 0 0 

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

I was reasonably certain it was the pressure sensor on the AdBlue pump that died so I replaced that but it did not solve the problem. After clearing all the codes in the engine module and they came back, I decided to do an AutoScan and this is the result.

Code:
Thursday,03,August,2017,18:52:32:25857
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x86
VCDS Version: 17.1.3.0
Data version: 20170320 DS267.7
www.Ross-Tech.com


VIN: WVGFM67L29D033942   License Plate: 
Mileage: 198970km-123634mi   Repair Order: 


Chassis Type: 7L (6N0)
Scan: 01 02 03 05 08 09 15 16 17 19 22 2E 36 37 46 47 55 56 68 69
          6C 6D 6E 76 77

VIN: WVGFM67L29D033942   Mileage: 198970km-123634miles

01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: Malfunction 0010
19-CAN Gateway -- Status: Malfunction 0010
22-AWD -- Status: OK 0000
2E-Media Player 3 -- Status: OK 0000
36-Seat Mem. Drvr -- Status: OK 0000
37-Navigation -- Status: Malfunction 0010
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: Malfunction 0010
47-Sound System -- Status: Malfunction 0010
52-Door Elect, Pass. -- Status: Malfunction 0010
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: Malfunction 0010
62-Door, Rear Left -- Status: OK 0000
68-Wiper Electr. -- Status: OK 0000
69-Trailer -- Status: OK 0000
6C-Back-up Cam. -- Status: Malfunction 0010
6D-Trunk Elect. -- Status: OK 0000
6E-Ctrl Head Roof -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
76-Park Assist -- Status: OK 0000
77-Telephone -- Status: Malfunction 0010
 
-------------------------------------------------------------------------------
Address 01: Engine (CAT)       Labels: 059-907-401-CAT1.clb
   Part No SW: 7L0 907 401 K    HW: 7L0 907 401 K
   Component: 3.0TDI EDC17G104AG  0100  
   Revision: 33H01---    Serial number: VWX3Z0H2826096
   Coding: 0421002A590F0968
   Shop #: WSC 91429 999 59371
   VCID: 3365111B515069D924-5106

2 Faults Found:
001617 - Sensor Reference Voltage B 
               P0651 - 000 - Open Circuit - MIL ON
             Freeze Frame:
                    Fault Status: 11100000
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 198976 km
                    Time Indication: 0
                    Date: 2017.08.03
                    Time: 19:49:52

             Freeze Frame:
                    RPM: 777 /min
                    Speed: 0.0 km/h
                    Voltage: 14.29 V
                    Load: 0.0 %
                    Torque: 218.4 Nm
                    Bin. Bits: 00000011
                    Bin. Bits: 00000001

008266 - Reductant Pressure Sensor Circuit 
               P204A - 000 - Electrical Malfunction
             Freeze Frame:
                    Fault Status: 11100000
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 198976 km
                    Time Indication: 0
                    Date: 2017.08.03
                    Time: 19:49:52

Readiness: 0 0 0 0 1 

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 09D-927-750.lbl
   Part No SW: 09D 927 750 HN    HW: 09D 927 750 HN
   Component: AL 750 6A           1473  
   Revision: 00H75000    Serial number:               
   Coding: 0004202
   Shop #: WSC 31414 790 00001
   VCID: 01098BD35B6C0B49E6-5140

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 7L0-907-379-MK25E1.clb
   Part No SW: 7L0 907 379 P    HW: 7L0 614 517 C
   Component: ESP ALLRAD MK25E1   0304  
   Revision: 00H53001    
   Coding: 0004354
   Shop #: WSC 31414 790 00001
   VCID: 468358CF35C2EC7193-8012

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth.        Labels: None
   Part No SW: 7L0 909 135 C    HW: 7L0 909 135 C
   Component:    Kessy            6850  
   Revision: 00H22071    Serial number: VWX3Z0H2826096
   Coding: 0000232
   Shop #: WSC 31414 790 00001
   VCID: 31691B13AC4C5BC956-8064

   Subsystem 1 - Part No: XXXXXXXXXXX 
   Component: ELV                 XXXX

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 7L6-907-040.clb
   Part No: 7L6 907 040 AK
   Component: CLIMAtronic R/L     4337  
   Coding: 0003030
   Shop #: WSC 31414 790 00001
   VCID: 79F9E33334BC5389AE-802C

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 7Lx-937-049-V2.clb
   Part No SW: 7L6 937 049 AF    HW: 7L6 937 049 AF
   Component: J519                2002  
   Revision: -0004---    Serial number: --------------
   Coding: A00008002F00BC000000000000000000
   Shop #: WSC 31414 790 00001
   VCID: 000F8ED757660241E9-8054

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 7L0-959-655.lbl
   Part No SW: 7L0 959 655 A    HW: 7L0 959 655 A
   Component: J234__0B VW8T       0270  
   Revision: 92013027    Serial number: 003C6001K3XZ  
   Coding: 0012354
   Shop #: WSC 00000 000 00000
   VCID: 3B75393B7E00A199FC-806E

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 7L6-953-549.lbl
   Part No: 7L6 953 549 G
   Component: J527                3601  
   Coding: 0010211
   Shop #: WSC 31414 790 00001
   VCID: 438541DB06F0D959B4-8016

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 7L6-920-xxx-7L6.lbl
   Part No SW: 7L6 920 890 P    HW: 7L6 920 890 P
   Component: J285 KOMBI-INST.    9733  
   Revision: KHH06V42    
   Coding: 0005101
   Shop #: WSC 91429 999 83899
   VCID: 45815FC30CC4E7699A-8010

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels: 6N0-909-901-7L.clb
   Part No SW: 6N0 909 901     HW: 7L6 920 890 P
   Component: J533  GW-K-CAN TP20 9733  
   Coding: 77E2EFDBCB846002
   Shop #: WSC 91429 999 83899
   VCID: 70EFDE1763C612C119-8024

No fault code found.

-------------------------------------------------------------------------------
Address 22: AWD        Labels: None
   Part No: 0AD 927 755 BG
   Component: TRANSFERCASE        0126  
   Shop #: WSC 00000 000 00000
   VCID: 01098BD35B6C0B49E6-5140

No fault code found.

-------------------------------------------------------------------------------
Address 2E: Media Player 3 (J650)       Labels: 5N0-035-342.lbl
   Part No SW: 5N0 035 342 B    HW: 5N0 035 342 B
   Component: SG EXT.PLAYER H13 0084  
   Revision: A1001003    Serial number: 7667332230    
   Coding: 020000
   Shop #: WSC 31414 790 00001
   VCID: 2643F84F51820C71B3-8072

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr        Labels: None
   Part No: 7L0 959 760 
   Component: Sitzverstellung     0702  
   Shop #: WSC 00000 000 00000
   VCID: 77FDE50B02A845F9D8-8022

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation (J0506)       Labels: 1T0-035-680.clb
   Part No SW: 7L6 035 684 B    HW: 7L6 035 684 B
   Component: RNS-MID       H01 0322  
   Revision: AB001001    Serial number: VWZ6Z7J8025033
   Coding: 200500000100002600
   Shop #: WSC 31414 790 00001
   VCID: 35612F039C2477E90A-8060

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 7L0-959-933.lbl
   Part No: 7L6 959 933 A
   Component: 4M HSG              0601  
   Coding: 0000085
   Shop #: WSC 31414 790 00001
   VCID: 408F4ED710E6C241A9-4AE8

   Subsystem 1 - Part No: 7L0 959 701 N
   Component: Tuersteuergeraet FS 6304

   Subsystem 2 - Part No: 7L0 959 702 N
   Component: Tuersteuergeraet BF 6304

   Subsystem 3 - Part No: 7L0 959 703 C
   Component: Tuersteuergeraet HL 0201

   Subsystem 4 - Part No: 7L0 959 704 C
   Component: Tuersteuergeraet HR 0201

1 Fault Found:
01134 - Alarm Horn (H12) 
            000 -  - 

-------------------------------------------------------------------------------
Address 47: Sound System        Labels: 7Lx-035-4xx-47.lbl
   Part No SW: 7L6 035 466 C    HW: 7L6 035 466 C
   Component: DSP 10 Kanal        0020  
   Revision: 00H05001    Serial number: 75835000576504
   Shop #: WSC 00000 000 00000
   VCID: 34671207575E6EE13D-8060

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 7L6-907-357-A.lbl
   Part No SW: 7L6 907 357 C    HW: 7L6 907 357 C
   Component: AFS-Steuergeraet    0136  
   Revision: 00H04000    Serial number:               
   Coding: 1290371
   Shop #: WSC 91429 999 83899
   VCID: 3B75393B7E00A199FC-806E

   Subsystem 1 - Part No: 7L6 941 329 B  Labels: 3D0-941-329.CLB
   Component: AFS-Lst.-Modul l    0004  
   Coding: 00000019

   Subsystem 2 - Part No: 7L6 941 329 B  Labels: 3D0-941-329.CLB
   Component: AFS-Lst.-Modul r    0004  
   Coding: 00000019

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (J0506)       Labels: 1T0-035-680.clb
   Part No SW: 7L6 035 684 B    HW: 7L6 035 684 B
   Component: RNS-MID       H01 0322  
   Revision: AB001001    Serial number: VWZ6Z7J8025033
   Coding: 200500000100002600
   Shop #: WSC 31414 790 00001
   VCID: 35612F039C2477E90A-8060

No fault code found.

-------------------------------------------------------------------------------
Address 68: Wiper Electr.        Labels: 7L0-955-119-V2.clb
   Part No: 7L6 955 119 B
   Component: J400__ Front Wiper  5301  
   Coding: 0001397
   Shop #: WSC 31414 790 00001
   VCID: 39792333703C9389EE-806C

   Subsystem 2 - Part No: 1K0 955 559 AH  Labels: 1K0-955-559-AG.CLB
   Component: RLS     200109 054  0402  
   Coding: 00208941
   Shop #: WSC 31414  

No fault code found.

-------------------------------------------------------------------------------
Address 69: Trailer        Labels: 7L0-907-383-1D2.lbl
   Part No SW: 7L0 907 383 N    HW: 7L0 907 383 N
   Component: J345  Anhaenger     0050  
   Revision: 4A007002    Serial number: 00000115911714
   Coding: 0016386
   Shop #: WSC 00000 000 00000
   VCID: 3F8D4D2B6A18BDB9D0-806A

No fault code found.

-------------------------------------------------------------------------------
Address 6C: Back-up Cam.        Labels: 5N0-907-441.clb
   Part No SW: 7L6 907 441 B    HW: 7L6 907 441 B
   Component: J772__Rearview      0033  
   Revision: 00H13000    Serial number:    PA8 J8Z0220
   Coding: 0010001
   Shop #: WSC 31414 790 00001
   VCID: 34671207575E6EE13D-8060

1 Fault Found:
03006 - Back-up Camera System not calibrated 
            000 -  - 
             Freeze Frame:
                    Fault Status: 01100000
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 238
                    Time Indication: 0

             Freeze Frame:
                        Invalid
                        Invalid
                        Invalid


-------------------------------------------------------------------------------
Address 6D: Trunk Elect.        Labels: 7L6-959-107.clb
   Part No SW: 7L6 959 107 B    HW: 7L6 959 107 B
   Component: J605  HECKKLAPPE    1310  
   Revision: --H05---    Serial number: --------043310
   Coding: 0122110
   Shop #: WSC 31414 790 00001
   VCID: 3A7B3C3F713A9891E7-806E

No fault code found.

-------------------------------------------------------------------------------
Address 6E: Ctrl Head Roof        Labels: None
   Part No SW: 7L6 919 044 AD    HW: 7L6 919 044 AD
   Component: J702  Dachdisplay   0401  
   Revision: 1030006S    Serial number: 00000000106554
   Shop #: WSC 00000 000 00000
   VCID: 79F9E33330BC5389AE-802C

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: Redir Fail!
   Part No: 7L0 919 283 F
   Component: 0L Einparkhilfe     1108  
   Shop #: WSC 00000 000 00000
   VCID: 39792333743C9389EE-806C

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone (J738)       Labels: 1K8-035-730.clb
   Part No SW: 1K8 051 730 B    HW: 1K8 051 730 B
   Component: Telefon       H02 5400  
   Revision: 00002000    Serial number: 20389520169533
   Coding: 412120
   Shop #: WSC 91429 999 83899
   VCID: 2643F84F51820C71B3-8072

No fault code found.

End-------------------------(Elapsed Time: 04:21)--------------------------

So I think there is something SERIOUSLY wrong here and has to do with the electrical system. Electrical gremlins are not my area of expertise so I was hoping someone on here with more knowledge and experience could help me out. I'm really hoping to get to the bottom of this myself so I don't have to take it to the dealership and have them bend me over the counter...

I've never seen this many "Malfunction" codes on modules before. Could this be an indication of a wiring issue or perhaps the ECU dying? or a problem with the CAN system?
 
Last edited:
   #2  

Uwe

Benevolent Dictator
Staff member
Joined
Jan 29, 2014
Messages
31,140
Reaction score
22,170
Location
USA
VCDS Serial number
HC100001
for some reason unable to post in the Car Repair forum.
You're a "New Member" here (as opposed to a "Verified User") because you've never registered the VCDS system you bought from a reseller with Ross-Tech for support. Please see this post.

-Uwe-
 
   #3  

MmmBoost

Verified VCDS User
Verified
Joined
Aug 4, 2017
Messages
14
Reaction score
2
Location
Canada
VCDS Serial number
C?ID=211202
I've just sent in my verification form on the VCDS site, so hopefully I'll be verified soon. Really hoping someone can help me out with this issue...
 
   #4  

Uwe

Benevolent Dictator
Staff member
Joined
Jan 29, 2014
Messages
31,140
Reaction score
22,170
Location
USA
VCDS Serial number
HC100001
Verified.

Moving to Car Repair Support.

-Uwe-
 
   #5  

iichel

Verified VCDS User
Verified
Joined
Aug 10, 2016
Messages
2,055
Reaction score
2,456
Location
Eindhoven, NB, NL
VCDS Serial number
C?ID=284912
So iet's have a look what the G686 Pressure sender for reducing agent metering system and the reference voltage have in common. Absolutely nothing :(

First DTC
G686 itself could be broken. I have no idea where to find it, probably on the AdBlue system, somewhere.
The wiring could be broken (check the wires from ECU to the sensor, T94/11 T94/17 and T60/38 to the sensor). Verify all wires end to end with a multimeter.

Second DTC
Reference voltage B is something thats calculated inside the ECU itself. From what I can read, it's not dependent on any wiring.
A fault inside the ECU would be the first suspect, but fuses are easier to check:
S9
S15

Also verify the earth points and wiring (on bulkhead, Earth Point 1). Maybe they are corroded or dirty.

Same issues, less DTCs: http://forums.tdiclub.com/showthread.php?t=345887
Error codes (Dutch): http://www.gerritspeek.nl/vag-com_dtc-17035.html
 
   #6  

Jack@European_Parts

NostraJackAss
Joined
Jan 29, 2014
Messages
21,196
Reaction score
8,962
Location
Montgomery, NY, USA
VCDS Serial number
C?ID=57337
Hello OP and welcome to the VCDS forum.

I have bad news ...........been here a few times.

You will need to immediately test the reductant circuit & MAP sensor using WD. Please verify the harness is not damaged first or contaminated with urea or oil causing a bridge that damages the control module or from a shared track.

When this happens it can cause the limp mode by damaging the EPC circuit within the controller as a result.

It is possible the sensors are faulty and shorted causing this damage too or the FOD part #!

Fuse installed inline added to the reductant & MAP sensor for each track will stop this from a future catastrophe.

NostraJackAss Has Spoken!
 
   #7  

MmmBoost

Verified VCDS User
Verified
Joined
Aug 4, 2017
Messages
14
Reaction score
2
Location
Canada
VCDS Serial number
C?ID=211202
First off, THANK YOU so much for chiming in here so quickly. I really appreciate it.

So iet's have a look what the G686 Pressure sender for reducing agent metering system and the reference voltage have in common. Absolutely nothing :(

First DTC
G686 itself could be broken. I have no idea where to find it, probably on the AdBlue system, somewhere.
The wiring could be broken (check the wires from ECU to the sensor, T94/11 T94/17 and T60/38 to the sensor). Verify all wires end to end with a multimeter.

Second DTC
Reference voltage B is something thats calculated inside the ECU itself. From what I can read, it's not dependent on any wiring.
A fault inside the ECU would be the first suspect, but fuses are easier to check:
S9
S15

Also verify the earth points and wiring (on bulkhead, Earth Point 1). Maybe they are corroded or dirty.

Same issues, less DTCs: http://forums.tdiclub.com/showthread.php?t=345887
Error codes (Dutch): http://www.gerritspeek.nl/vag-com_dtc-17035.html
The G686 is located right on the AdBlue pump. I bought a new pump and swapped it, but the issue was not solved.......so I'm learning toward a wiring or controller fault. There was no warning or intermittent issues, this happened out of nowhere which seemed very strange to me.

Unfortunately I don't have access to any wiring diagrams, so it's difficult for me to actually track this down myself. There is VERY little information on Touaregs floating around out there, do you by chance have a wiring diagram I could follow?

I'll have a look at the fuses you mentioned when I get home from work this evening. Also going to try and check the grounds and battery cables.


The first night I found these faults I went through an output test on the engine module and everything seemed to be functioning properly. After I went through all of this and cleared the codes on 01-Engine, none of them came back while the vehicle was starting and running for 5 minutes and then all of the sudden the check engine lights started flashing again and I got the same 2 codes for p204a and p0651. Since then I haven't been able to make the codes go away again following my same steps.



Hello OP and welcome to the VCDS forum.

I have bad news ...........been here a few times.

You will need to immediately test the reductant circuit & MAP sensor using WD. Please verify the harness is not damaged first or contaminated with urea or oil causing a bridge that damages the control module or from a shared track.

When this happens it can cause the limp mode by damaging the EPC circuit within the controller as a result.

It is possible the sensors are faulty and shorted causing this damage too or the FOD part #!

Fuse installed inline added to the reductant & MAP sensor for each track will stop this from a future catastrophe.

NostraJackAss Has Spoken!

I don't have any wiring diagrams to go from unfortunately, so it's difficult for me to test the harness :(

Have you seen this exact issue? Or a similar one?

I have ever seen so many "Malfunction 0010" codes in a scan before and I've owned VWs and Audis for 12 years now.
 
   #8  

iichel

Verified VCDS User
Verified
Joined
Aug 10, 2016
Messages
2,055
Reaction score
2,456
Location
Eindhoven, NB, NL
VCDS Serial number
C?ID=284912
   #9  

Jack@European_Parts

NostraJackAss
Joined
Jan 29, 2014
Messages
21,196
Reaction score
8,962
Location
Montgomery, NY, USA
VCDS Serial number
C?ID=57337
Have you seen this exact issue? Or a similar one?
YUP!


Well my notes indicate you can also have an issue with the shared turbo charger module tracks on J724

My money was on the Z102 which is the heater in that POS causing a back feed to the J623 from the sensor doing an internal short.
 
Last edited:
   #10  

MmmBoost

Verified VCDS User
Verified
Joined
Aug 4, 2017
Messages
14
Reaction score
2
Location
Canada
VCDS Serial number
C?ID=211202
Yeah when it comes to WD, I do have acces to them via the official VW ElsaWIN program. Sharing them publicly is a bit of a grey area. They are probably copyrighted but there is such a thing as fair use as well.

For consumers and workshops, there is the ERWIN for WD: http://wiki.ross-tech.com/wiki/index.php/Official_Factory_Repair_Information
Reading wiring diagrams: http://forums.ross-tech.com/showthr...ad-wiring-diagrams-the-videos-(final-version)
I can understand it's a bit of a grey area, I wasn't sure what the policy was so I thought I'd ask. There is so little information available on forums and google for the Touareg I was hoping I would be able to get something to help.

Well my notes indicate you can also have an issue with the shared turbo charger module tracks on J724
This MIGHT actually be the case Jack. So when I run through the output tests on the 01-Engine module, the only output that doesn't seem to respond is the turbocharger control actuator (can't recall the actual name for it in VCDS). So how would one go about checking this? I know when I pulled the engine cover off the engine last week I had some oil residue on the turbocharger and I noticed some soot on the turbocharger from a small exhaust leak I've been delaying fixing. Do you think this could be what's shorting things out and causing the issues??

Also I felt I should mention that the very first time that I ran the output test after my limp-mode issues, the actuator worked. Now when I run it, nothing happens and it seems stuck in the wrong orientation because when I start the vehicle and it idles, it sounds different than it always has.
 
Last edited:
   #11  

MmmBoost

Verified VCDS User
Verified
Joined
Aug 4, 2017
Messages
14
Reaction score
2
Location
Canada
VCDS Serial number
C?ID=211202
So I've just purchased a 1-day subscription to ERWIN and got ahold of the wiring diagrams. Trying to track down the information I need to test these circuits.

Could you tell me what page/diagram I should be looking at to see how the Turbocharger control module ties in with the Adblue System?
 
   #12  

Jack@European_Parts

NostraJackAss
Joined
Jan 29, 2014
Messages
21,196
Reaction score
8,962
Location
Montgomery, NY, USA
VCDS Serial number
C?ID=57337
Please print all documents to PDF first and then hit control F to search for wild cards.
 
  • Like
Reactions: Uwe
   #13  

DV52

Verified VCDS User
Verified
Joined
May 16, 2014
Messages
3,878
Reaction score
4,316
Location
Melbourne, Australia
VCDS Serial number
C?ID=194404
So I've just purchased a 1-day subscription to ERWIN and got ahold of the wiring diagrams. Trying to track down the information I need to test these circuits.

Could you tell me what page/diagram I should be looking at to see how the Turbocharger control module ties in with the Adblue System?
MmmBoost: If I can add to Jack's excellent suggestion - here's a couple of other ways of finding stuff assuming that you use Adobe reader:



In the first screen, select the "magnifying glass" shown in the circle and the find dialogue box opens. Enter the search criteria (i.e. "turbo" in the pic.) and then repeatedly press "next" to go to each hit

The facility in the first screen finds individual hits, whereas the second screen is a more detailed search facility that yields a table of all hits in the document

Both ways are very good, but I use the first method if the search criteria has only a few hits -otherwise, it gets very tiresome going to the next hit. But the choice is yours!!

Don
 
   #14  

iichel

Verified VCDS User
Verified
Joined
Aug 10, 2016
Messages
2,055
Reaction score
2,456
Location
Eindhoven, NB, NL
VCDS Serial number
C?ID=284912
In addition, if you want to know what's connected to your ECU, search for i.e. J623 (codename for the ECU) or T96 and T60 (the plugs that go into the ECU).
I'm usually making lists and illustrated images of what goes where on a connector, this way short circuits or FOD are easier to visualize.
 
   #15  

MmmBoost

Verified VCDS User
Verified
Joined
Aug 4, 2017
Messages
14
Reaction score
2
Location
Canada
VCDS Serial number
C?ID=211202
Well I've made a little progress so far. I've been following the diagnostic procedures for the G686 Reductant Pressure Sensor as well as the J724 Turbocharger Control Module. So far both tests failed the initial voltage tests looking for 5V with the key on. For G686 it was pin 1 to 3 looking for 5V and for J724 it was pins 3 to 5 looking for 5 volts. Both gave me readouts of about 0.64V .... the next step in both procedures is to check the wiring harness to the ECM.......however the friggin connector on the ECM is bolted on with anti-tamper bolts. I haven't got around to tackling this just yet, but it's kind of looking like my ECM has crapped the bed.

Jack, you mentioned that the heater circuit might be backfeeding into the pressure sensor circuit. Do you think if I unplugged the heater control module I would see any different results?


If my ECM is infact dead, what is the procedure for replacing it? I'm concerned about the immobilizer coding..
 
   #16  

Jack@European_Parts

NostraJackAss
Joined
Jan 29, 2014
Messages
21,196
Reaction score
8,962
Location
Montgomery, NY, USA
VCDS Serial number
C?ID=57337
Well I've made a little progress so far. I've been following the diagnostic procedures for the G686 Reductant Pressure Sensor as well as the J724 Turbocharger Control Module. So far both tests failed the initial voltage tests looking for 5V with the key on. For G686 it was pin 1 to 3 looking for 5V and for J724 it was pins 3 to 5 looking for 5 volts. Both gave me readouts of about 0.64V .... the next step in both procedures is to check the wiring harness to the ECM.......however the friggin connector on the ECM is bolted on with anti-tamper bolts. I haven't got around to tackling this just yet, but it's kind of looking like my ECM has crapped the bed.

Jack, you mentioned that the heater circuit might be backfeeding into the pressure sensor circuit. Do you think if I unplugged the heater control module I would see any different results?


If my ECM is infact dead, what is the procedure for replacing it? I'm concerned about the immobilizer coding..

Yeah, you could unplug the heater to isolate it for testing......... plus simulate with variable resistor while observing VCDS advance block values.

If the ECU is indeed screwed........ let me know........ I can help with a data transfer to another used unit you supply or sell you one with a data transfer from yours.

If so please us the contract form and ref the thread so the office knows because RT forum referrals get a discount.

We have the units .........

That ecu is over 2K at the dealer + programming but I am sure I can hook you up if need be.

It is important to test all the tracks and sensors, so get to it on the tamper proofs.

We want to know what has ran interference with the ECU before plugging in a new or replacement unit.

Do you still have the old sensor for testing to compare with a DVOM or lite off the heater manually while measuring values?

Do not be afraid to run fuses to protect stuff if you are unsure of your abilities going forward.

NostraJackAss Has Spoken!



 
Last edited:
   #17  

MmmBoost

Verified VCDS User
Verified
Joined
Aug 4, 2017
Messages
14
Reaction score
2
Location
Canada
VCDS Serial number
C?ID=211202
Thanks again Jack for the quick response. I really appreciate you helping me try to track this down.


Yeah, you could unplug the heater to isolate it for testing......... plus simulate with variable resistor while observing VCDS advance block values.

If the ECU is indeed screwed........ let me know........ I can help with a data transfer to another used unit you supply or sell you one with a data transfer from yours.

If so please us the contract form and ref the thread so the office knows because RT forum referrals get a discount.

We have the units .........

That ecu is over 2K at the dealer + programming but I am sure I can hook you up if need be.

It is important to test all the tracks and sensors, so get to it on the tamper proofs.

We want to know what has ran interference with the ECU before plugging in a new or replacement unit.

Do you still have the old sensor for testing to compare with a DVOM or lite off the heater manually while measuring values?

Do not be afraid to run fuses to protect stuff if you are unsure of your abilities going forward.



I see that the pins 3 and 5 going into the Turbocharger Control Module (G581/J724/V280) come from Tracks 110 and 137 respectively. 110 is shared with G450 the exhaust pressure sensor and 137 is shared with the G686 Reductant Pressure Sensor. This is the exact sensor I'm having issues with. The 137/215 tracks are both coming from "D195 Connection 5V (in engine compartment wiring harness) 1" ........so it's looking like this may be where the problem lies since I'm also getting an a P651 code "Sensor Reference Voltage B" which from what I've read on other forums is a code that pops up when there is an issue with a 5V reference wire/circuit. Sounding pretty reasonable?

What's the likelihood that this wire is shorting out or broken somewhere and it hasn't actually screwed up my ECM?


Time gap. Before hitting send I did all the diagnostics on the 2 sensor issues in the repair manual.


Ok...... here are the results of testing after finally getting the anti-tamper bolts off. What a nightmare those were. I broke 2 screwdrivers trying to get them out after dremeling a groove into them..

G686
Pin 1 to 3: .6-.8V (nowhere near the 5V it's supposed to be)
Pin 1 to T94aa/17: 0.4 Ω (within the 0.5 ± 0.3 Ω spec)
Pin 2 to T94aa/11: 0.4 Ω (within the 0.5 ± 0.3 Ω spec)
Pin 3 to T60/38: 0.3 Ω (I assume within the 0.5 ± 0.3 Ω spec)



J724
Pin 3 to 5: 0.6-1.0V (nowhere near the 5V it's supposed to be)
Pin 3 to T94aa/79: 0.4 Ω (within the 0.5 ± 0.3 Ω spec)
Pin 5 to T94aa/17: 0.4 Ω (within the 0.5 ± 0.3 Ω spec)



So..... It's kind of not looking for for the ECM at this point.
 
Last edited:
   #18  

Jack@European_Parts

NostraJackAss
Joined
Jan 29, 2014
Messages
21,196
Reaction score
8,962
Location
Montgomery, NY, USA
VCDS Serial number
C?ID=57337
I see that the pins 3 and 5 going into the Turbocharger Control Module (G581/J724/V280) come from Tracks 110 and 137 respectively. 110 is shared with G450 the exhaust pressure sensor and 137 is shared with the G686 Reductant Pressure Sensor. This is the exact sensor I'm having issues with. The 137/215 tracks are both coming from "D195 Connection 5V (in engine compartment wiring harness) 1" ........so it's looking like this may be where the problem lies since I'm also getting an a P651 code "Sensor Reference Voltage B" which from what I've read on other forums is a code that pops up when there is an issue with a 5V reference wire/circuit. Sounding pretty reasonable?



Yup..........


What's the likelihood that this wire is shorting out or broken somewhere and it hasn't actually screwed up my ECM?
Well both scenarios happen but I usually see more ecu's because anyway and than I find out their diagnosis was wrong.

Unplug the track at ecu and if it wakes up at ecu there's your answer.
 
   #19  

MmmBoost

Verified VCDS User
Verified
Joined
Aug 4, 2017
Messages
14
Reaction score
2
Location
Canada
VCDS Serial number
C?ID=211202
Yup..........

If this IS the issue, I this is inside of the ECM right, nothing I can do about it?



Well both scenarios happen but I usually see more ecu's because anyway and than I find out their diagnosis was wrong.

Unplug the track at ecu and if it wakes up at ecu there's your answer.
Well I've already thrown a bunch of money at this with the Adblue pump which I thought had failed. I never imagined that my ECM would just up and die out of nowhere........so I definitely want to be correct about my diagnosis. How would "the common man" go about ensuring the ECM is dead?

What do you mean by "unplug the track"? As in remove the pins from the harness connector? Or is this something that I can do if I open up the ECM?
 
   #20  

MmmBoost

Verified VCDS User
Verified
Joined
Aug 4, 2017
Messages
14
Reaction score
2
Location
Canada
VCDS Serial number
C?ID=211202
I tried to get the ECM opened up to have a look inside and see if there was anything obviously wrong, but it has some sort of weather-sealing adhesive on it. Not sure if there's anything I'd be able to see or do in there anyway so I didn't want to force it open and break the seal.
 
Top