3.0 TDI sticky/failing turbo

[wolek76]

Hello everyone. I have a bit of a problem with my 56reg 3.0TDI q7. Basically, the motor revs up but there is no power whatsoever. I have a car-wizard handy in my family and he had quickly diagnosed that my turbocharger is way 'too stiff' to operate, and sometimes doesn't move at all (which was confirmed by a vag scan). Now, he can do the 'cleaning out' of the turbocharger himself (he's done it in the past in the garage he used to work) so hopefully no probs on this side. The problem we have is sourcing the right seals and gaskets that will be required after removal from the motor. Could anyone confirm that I need at least two seals/gaskets (one on the exhaust side and one on the air-intake side) and if that's the case, what exactly to buy and where, please? We are planning 'the surgery' for the next weekend so I have a week to get them. Any help is highly appreciated.

[Guest 2]

Ideally you need a scan with diagnostic equipment such as vcds

Engine number would be handy to have.

Welcome to VWAF

[wolek76]

Wow! That's a quick reply . Thank you for the welcome. I was a long time lurker/reader but couldn't contribute more than there is already here. Here is the part of VCDS scan: Address 01: Engine Labels: Redir Fail!
Part No SW: 4L0 910 401 M HW: 4L0 907 401
Component: 3.0L V6TDI G000AG 0030
Revision: --H03--- Serial number:
Coding: 0011775
Shop #: WSC 31414 790 00001
VCID: 2C5C06EEB051217C

1 Fault Found
013128 - Control Circuit for Controller for Turbocharger 1 (J724): Electrical Malfunction
P3348 - 005 - No or Incorrect Basic Setting / Adaptation - Intermittent
Freeze Frame:
Fault Status: 00100101
Fault Priority: 0
Fault Frequency: 5
Mileage: 132366 km
Time Indication: 0
Date: 2013.05.01
Time: 16:57:47

Freeze Frame:
RPM: 966 /min
Torque: 140.4 Nm
Speed: 0.0 km/h
Temperature: 32.4°C
Duty Cycle: 80.9 %
Voltage: 13.30 V
Duty Cycle: 88.8 %

Readiness: 0 0 0 0 0
hope that's enough info.

[Igloo]

That indicates a controller failure rather than turbo failure.


19804/P3348/013128 - Control Circuit for Controller for Turbocharger 1 (J724): Electrical Malfunction

Possible Symptoms
Malfunction Indicator Light (MIL) ON

Possible Causes
Fuse(s) faulty
Wiring and/or Connector(s) from/to Controller for Turbocharger 1 (J724) faulty
Controller for Turbocharger 1 (J724) faulty

Possible Solutions
Check Fuse(s)
Check Wiring and/or Connector(s) from/to Controller for Turbocharger 1 (J724)
Check/Replace Controller for Turbocharger 1 (J724)
Perform (Selective) Output Test, the Vane Positions should change visibly and audibly
Perform System Test using VAS 6395
Special Notes





When stored in the 3.0l TDI (ASB/BKS/BMK/BNG) with throttle body faults P106B/004203 and/or 17988/P1580/005504 check the throttle unit and wiring for issues that may be falsely causing the turbocharger fault. This note is in reference to customer feedback, not official TSB or TPI documentation.
Category: Fault Codes

[wolek76]

Yes. We've checked these already (as much as possible). But then my guy took of the shaft that drives the 'flaps' in the charger and tried moving it 'manually'. According to him it should move effortlessly. Unfortunately that's not the case. Frankly, he had already managed to repair the steering rack and pretty much everything else that my Q7 threw at him so I see no reason not to trust him (he's my cousin too :-) ).
But nevertheless thank you for your input :-)

[Igloo]

Fair enough.

Just thinking of checking easy things before stripping the turbo.

Are these 3.0TDi's not bi turbo?

[Guest 2]

single turbo

[wolek76]

Now, thats a good question. I suppose I'd better give him a ring and as the same question. Although I do believe he would have known that alrewdy. Perhaps somebody else here might know better...
BTW, I am not a car mechanic but as far as I can tell there is only one air filter and there's only one fat tube going from it to the turbocharger. So I guess its just one?

[wolek76]

Im too slow typing ... but Right :-D

[Igloo]

How boring.

(Sorry o/t)

Garrett Model GTB1749VK Repair List - 767378-0005 reference - Turbos - TurboMaster

This link is for the turbo on the q7 3.0 tdi.

I would recommend ensuring this is your turbo first.