3.0 Tdi turbo issue

[rajw5]

Hi all, my first post here so be gentle!

Just got VCDS to find issue with check engine light that came on (when I wasn't driving!)


Got VCDS today and it shows two faults:

16619 - Boost Pressure
P0235 - 001 - Regulation Range not Reached - MIL ON
Freeze Frame:
RPM: 2478 /min
Torque: 304.2 Nm
Speed: 110.9 km/h
Absolute Pres.: 2172.6 mbar
Absolute Pres.: 1122.0 mbar
Mass Air / Rev.: 552.3 mg/str
Temperature: 20.7°C
Duty Cycle: 15.8 %


19804 - Control Circuit for Controller for Turbocharger 1 (J724)
P3348 - 008 - Electrical Malfunction - Intermittent
Freeze Frame:
RPM: 0 /min
Torque: 167.7 Nm
Speed: 0.0 km/h
Duty Cycle: 1.0 %
Voltage: 11.78 V
Bin. Bits: 00101111
Absolute Pres.: 999.6 mbar
Absolute Pres.: 979.2 mbar


Readiness: 1 1 0 0 0

I know one of the solutions is to replace the controller but I'm being told this is not available separately. Would it be much cheaper to do this if possible or a false economy if turbo is on the way out?

[gupsterg]

16619 - Boost Pressure
P0235 - 001 - Regulation Range not Reached - MIL ON
Absolute Pres.: 2172.6 mbar
Absolute Pres.: 1122.0 mbar

19804 - Control Circuit for Controller for Turbocharger 1 (J724)
P3348 - 008 - Electrical Malfunction - Intermittent

I know one of the solutions is to replace the controller but I'm being told this is not available separately. Would it be much cheaper to do this if possible or a false economy if turbo is on the way out?

I would think you are getting boost pressure fault due to fault on the turbo actuator (J724) , the turbo is made by Borgwarner, the actuator can be by VDO / Siemens or other ...

This member has replaced his :-

... recently just changed a few things on my a6 c6 3.0 tdi

... new turbo actuator.. gas i was using the old throttle body circut board to run old actuator while i was waiting on new replacement worked fine just had to cut it to fit and had check light on dash but kept me driving anyways got new actuator installed it and guess what did not work i was thinking i would need a atd-1 to set geometry but tried vcds and carried output test on old actuator and switched leads to new actuator during test and seems to work happy days

Perhaps once you have more than 10 posts contact him via PM for share of info , I also have other procedure on replacement of the actuator ...

In another post you state your car is a 54 plate? if so like my 55 plate officially no replacement motor but I have info for VIN higher than WAUZZ4F(x)6(x)016 000 vehicles ...

		Turbocharger P/N
059 198 201 A	Servomotor for turbocharger (4 Pin)	059 145 715 E 059 145 715 F
059 198 201	Servomotor for turbocharger (5 Pin)	059 145 715 T 059 145 721 E 059 145 721 F

If I was in your shoes I'd first check if turbo sticking, which could lead to motor fault. Next I'd remove the arm between motor and turbo and run output test in module 1 via VCDS to check motor function. Then on result of those would decide next step ...

I'm just an owner so my advise is provided via reading info and have no experience with you specific fault ...

[gupsterg]

Few days ago viewing a site I found this, it is relating to dealer VAS machine. I checked on my BMK engine and this basic setting in module 01 is available via VCDS, I never did it though ...

033 Basic setting: Turbocharger
1) Coolant temperature at least 80 °C
2) Switch off ignition briefly, then start engine
3) Start basic setting
4) Follow driver instructions
(pedals must be pressed)
5) Wait for the engine speed rise to approx. 1000 rpm

KNote:
The turbocharger is now activated at intervals at different
duty cycles.
Specifications at "closed":
Engine speed: approx. 1000 rpm
Activation: closed
Actual charge pressure: 970 ... 1150 mbar
Charge pressure adjuster feedback: 98 ... 100 %
Specifications at "open":
Engine speed: approx. 1000 rpm
Activation: open
Actual charge pressure: 910 ... 1050 mbar
Charge pressure adjuster feedback: 0 ... 2 %
Charge pressure difference between "closed/open": 50 ... 135 mbar OK is OK


So open VCDS, access module 01, select basic settings, enter 033 then ON/OFF/NEXT button to initiate.

I did not test this yet.