P2563 A3 CBBB 170 TDi - At a loss

A

a3evotg

Registered User
Joined
Mar 6, 2015
Messages
24
Reaction score
1
Points
3
Hi all,

Bought this heap of crap only 2 weeks ago.

2009 A3 S Line with the 2 litre 170 bhp engine, 97k on clock full history

Once the car is warm and you are sat with it ticking over, the moment you touch the accelerator the glowplug light starts flashing. It will then come on and off when your driving.

Scan on vagcom is P2563 signal implausible - intermittent

All vac hoses checked - no issues
Wiring checked - no issues

I let a vag dealer look at it, who did a electrical test on the electronic actuator, which came back fine, as did vac test came back fine, checked it all on vagcom, made sure it was setup okay, handed me it back, got down the road the lights flashing again.

Ive done the test on the actuator on vagcom, before the test, it shows the readings in the 4 boxes as

-1.6% 0.8% 01000110 1.900v


When you test it, the voltage goes up and down between 0.7 volts and 3.6 volts.

Is this just a dodgy actuator, the electrical part at fault?

Also I ran a test on the throttle body and now the car is ticking over at 1100 revs? how do i fix this?

Thanks
 
http://wiki.ross-tech.com/wiki/index.php/18995/P2563/009571

18995/P2563/009571 - Turbocharger Boost Control Position Sensor Circuit: Implausible Signal
Possible Symptoms
  • Malfunction Indicator Lamp (MIL) ON
  • Power Loss
Possible Causes
  • Wiring and/or Connections from/to Vane Position Sensor (G581) faulty
  • Engine Control Module (ECM) faulty
  • Vane Position Sensor (G581) faulty
    • Binding Issues due to Adjustment/Turbocharger
    • Excessive Carbon build-up
  • Vacuum Leak from/to Turbocharger (Wastegate) Actuator and Solenoid Valve for Boost Pressure Control (N75)
Possible Solutions
  • Check/Replace Fuses
  • Check Wiring and/or Connections from/to Vane Position Sensor (G581)
  • Check Vane Position Sensor (G581)
    • Perform Ohm Test
  • Check Mechanical Turbocharger Operation
    • Rule out binging and excessive Carbon build-up
  • Check Vacuum Supply from/to Solenoid Valve for Boost Pressure Control (N75) and Turbocharger (Wastegate) Actuator
Special Notes
  • This fault code may be caused when the Actual and Specified Turbocharger requests are considered Implausible by the engine controller.

When this fault is found in the NAR Market 2.0L CR TDI:

  • Measuring Block Group 034.2 (specified) and 034.3 (actual) G581 Vane Position Sensor values can be logged to see if the fields should mirror each other or deviate to confirm a problem.

The actuator for the turbo is not what is being reported it's the feedback from the position sensor on the VNT mechanism.
Could be there is carbon in the VNT mechanism stopping it from going to the correct position.

http://forums.ross-tech.com/showthr...r-Boost-Control-Position-Sensor-Circuit-P2563
 
Thanks for your reply. I cant for the life of me access measuring blocks 34.2 and 34.3 , or find them, in fact doing .2 , .3 etc doesnt seem an option on my vagcom even though its the full version.

I didnt think this would be sooted up turbo related? Ive had no end of vag diesels and when the turbos are gummed up it usually results in limp mode, overboost fault codes? can you do the mr muscle trick on these turbos like you can with the pd140 , older pd130s etc?
 
Those cars don't have a position sensor built into the turbo that detects whether the vanes are in the correct place or not. So the ECU only knows there is a problem when the boost goes out of control so causing limp mode or overboost fault codes. Because the ECU can see the VNT isn't where it should be you get that fault code first. It's not unknown for the position sensor itself to go faulty and I am not sure if they are replaceable.
 
How do i do this on vcds?

Its been fine for 2 days no flashing light, no fault codes, now tonight it started again, it only seems to do it, when warm, idling sets it off after a few minutes, then itl constantly flash at low speeds but you put the boot down and it soon goes off.
 
audi upgrades
Vacuum system is fine.

Its an intermittent fault, im believing it to be the electrical part of the actuator, or vane position sensor, G581 etc whichever you chose to call it.

Sunday and Monday - No fault codes, no flashing glow plug light

Tuesday was fine till i sat with it idling for 5 minutes, i touched the accelerator and it began to flash, and then flashed on and off all the way home.

Wednesday same as tuesday, only when i put the power down the light goes off.

Today ive had the light flashing all day and now the engine managment light is on aswell as the flashing glow plug light, same code P2563 signal intermittent or implausable.
 
An oscilloscope on pin 2 of the vane position sensor would be nice vs boost etc.
Ross tech should tell you the measuring blocks for VCDS or choose advanced measuring blocks.
When steaming live data in VCDS plot these on a graph:
  • vane position
  • boost pressure (actual)
  • throttle position
  • accelerator pedal position
 
Every check so far has come back fine. Not had the eml light or the flashing glowplug light now for 2 days until tonight. Sat idling whilst eating food in the car air con on, glowplug light starts flashing, turned engine off then on again, light gone, drove 2 mile down the road its on again. So plugged the handheld code reader into it, P2563 again, clear the codes, got another mile down the road and it threw a proper paddy, flashing glow plug, eml light, down on power but no limp mode. Its going back next week theyre gonna change the vane position sensor on it, if this doesnt fix it itl meet its maker with a gallon of shells finest and a pack of swan vestas. the steering is now making this awful dry squeaking sound when you turn left from somewhere down near the pedals too. god awful car, i should have walked away when the dealer said he got it from an auction. its just on the test drive it was fine.
 
a3evotg said:
Every check so far has come back fine. Not had the eml light or the flashing glowplug light now for 2 days until tonight. Sat idling whilst eating food in the car air con on, glowplug light starts flashing, turned engine off then on again, light gone, drove 2 mile down the road its on again. So plugged the handheld code reader into it, P2563 again, clear the codes, got another mile down the road and it threw a proper paddy, flashing glow plug, eml light, down on power but no limp mode. Its going back next week theyre gonna change the vane position sensor on it, if this doesnt fix it itl meet its maker with a gallon of shells finest and a pack of swan vestas. the steering is now making this awful dry squeaking sound when you turn left from somewhere down near the pedals too. god awful car, i should have walked away when the dealer said he got it from an auction. its just on the test drive it was fine.
Click to expand...
Are you not within the 30 return period? Can you not return the car if the issue cannot be repaired?
 
Still waiting for them to book me in.

Just thought id update.

Did a 100 mile round trip today, A roads, Motorway. and didnt see the glowplug light flash once, the only noticeable thing is hesitation when booting it through the gears, you feel it pull, lag a bit, pull but its only very slightly.

Then after driving there, stopping, back home again I went and got food, sat in the carpark eating, engine running, aircon on and the glowplug light starts flashing again.

So it really is only something that happens when the car is idling, if you dont give the car a chance to idle, it wont do it, but once it starts flashing, doesnt matter if you turn it off and on again, the glow plug light will continue to come on until the engine cools down again or is sat for a bit.

Someone else said about a boost leak could cause it, but im not convinced, it does pull well so dont think ive got any boost leaks, but then again it does chuff a lot of black smoke out on boost.

If only there was an easy way to check for boost leaks. Im thinking of fixing it and getting rid.
 
Thought id update this. After many checks the actuator voltage is showing issues. It should be between 0.6 and 3.6v. It goes upto 3.6v but wont go any lower than 1.2v, it seems to be sticking once the engine is warm. The VNT mechanism in the turbo is smooth and the rod moves freely on the actuator, but then it gets intermittently stuck, reads 1.2v which then throws the p2563 intermittent code. Its booked in to be changed this week. warranty wont touch it because its an intermittent fault.
 
You must log in or register to reply here.

Similar threads

S-line57
A3 2.0 tdi 170 power loss
Replies
10
Views
1K
S-line57
S-line57
C
Audi a3 2.0 tdi cr 170 CBBB 2009. balance shaft delete
Replies
3
Views
5K
Gazwould
Gazwould
A
A3 cbbb 2.0 tdi turbo failure need advice
Replies
2
Views
1K
Andy90
A
SteveTDCi
A3 170 TDi
Replies
5
Views
1K
Vertigo1
Vertigo1
K
A3 TDI 170
Replies
40
Views
2K
gizze
gizze
Top
Back