Is_me

Hi all, hope someone can help me on this...
I have a Audi A6 3.0 TDI Quattro Tiptronic MY 2007 with engine coded ASB (171 KW). The car has 88300 KM.
The other day went for a spin... car took a long time to start....
Checked with VAG-COM (original) and VCDS... found this:

013112 - Control Circuit for Glow Plug Controller 1
P3338 - 001 - Electrical Malfunction
Freeze Frame:
Fault Status: 01100001
Fault Priority: 0
Fault Frequency: 1
Mileage: 88328 km
Time Indication: 0
Date: 2014.12.14
Time: 17:06:45

Freeze Frame:
RPM: 777 /min
Torque: 62.4 Nm
Speed: 0.0 km/h
Duty Cycle: 1.0 %
Voltage: 13.83 V
Duty Cycle: 0.4 %
Temperature: 81.0°C


... as well as open circuit fault for all glow plugs (also checked with multimeter and infact they were bad). Checked the harness... all good.
Fuses... all good. No corrosion, no water damage... nothing.
Checked supply voltages for the glow plug relay... all good and stable.
Checked for voltage at the glow plug connectors and found this:
- With engine stopped, ignition off - 0 Volts (as expected)
- With engine stopped, ignition on - 0 Volts (o.O wtf???)
- With engine running.... see this video:

voltage is not constant... what the f*** is going on there???

PLEASE HELP

Is_me

Sorry, forgot to say that new plugs were installed and the relay also changed to a new one (all original parts). The new GP's are the correct ones (metal), I'm 100% sure they are the correct ones... any advice?

Prospeeder

Not real familiar with the Audi diesel, but Mercedes diesels throw this fault commonly and the glow plug controller itself is defective.

Is_me

Many thanks for your reply...
I already changed the glow plug controller module but I still have the same problem....
Made also an "overlay" wiring to the glow plugs... still the same problem...
I'm driving the car "as is" without glow plugs at the moment, as it starts every time even when cold...