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Audi A5 TFSi 2008 - fault codes 4096 & 2968, request schematics - Fixed #

Posted by lee hemmings on September 27, 2012, 4:35 pm

Year of Manufacture *: 08
Engine Size and Code *: 2000 TFSI
( Optional ) Scanner Used: VCDS

Hi all

I have the above vehicle with 2 fault codes stored,( 4096-bank 1 cmp sensor/ engine speed incorrect correlation, and 2968-intake manifold flap position sensor bank 1)

The manifold as the flaps inside which are FAMOUS for breaking, but i have tested them with a mityvac and they are in good condition, so is the diaphram which uses vacuum to open them, and the vac lines themselves. Using vcds i can hear the controller clicking which controls the vacuum.To prove the system i put my vac gauge on the inlet side applied vac and with ign on only used vcds again to operate the system and my gauge read went back to zero which shows the contoller is capeable of working, but the code still returns.
Next for the cam/crank code i know it as had both sensors at a previous garage, so i quickly put a vac gauge on the engine to check timing and see 28 hg vac, which to me is too high(18 to 20) and think it as a restriction of some sort- cant find one.Car runs and idles well, i am begining to think its an electronics fault somewhere therefore am asking for any schematics on this engine or just any input/thoughts.
Thanks lee

Re: Audi A5 with 2 fault codes, request schematics

Posted by Lee Mackintosh <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1348' width='330' height='300' border=0 style='border:none;'> on September 27, 2012, 5:51 pm, in reply to " Audi A5 with 2 fault codes, request schematics"
Lee Mackintosh

I can't remember why or how its achieved but a TFSi engine i think doesn't have the normal vacuum at idle as we're used to seeing.

Its something to do with the direct injection setup as the throttle doesn't work like a normal system.

I think they work more like a diesel rather tahn a conventional fuel injected car but i'm srue other's will be along to correct me if i'm toaking complete bolloc*s

Re: Audi A5 with 2 fault codes, request schematics

Posted by Ian Slattery <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1196' width='330' height='300' border=0 style='border:none;'> on September 27, 2012, 6:47 pm, in reply to "Re: Audi A5 with 2 fault codes, request schematics"
Ian Slattery

Hi Lee

Have a look at the latest aftermarket magazine there is a article by James Dillon that may be of interest.

Its available online. HTH.

Regards Ian.

Re: Audi A5 with 2 fault codes, request schematics

Posted by lee hemmings <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3416' width='330' height='300' border=0 style='border:none;'> on September 27, 2012, 8:36 pm, in reply to "Re: Audi A5 with 2 fault codes, request schematics"
Lee Hemmings

Hi Ian what online mag are we talking about and how do we view it, the only one i know off is the Frank Massey one which i subscribe to....

Re: Audi A5 with 2 fault codes, request schematics

Posted by Peter Mutlow on September 27, 2012, 8:51 pm, in reply to "Re: Audi A5 with 2 fault codes, request schematics"
Message modified by board administrator September 30, 2012, 1:09 pm

Hi Lee,

Try this:

http://www.flippincool.co.uk/afm1012/

Regards

Pete M

Re: Audi A5 with 2 fault codes, request schematics

Posted by Alan Lange <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3293' width='330' height='300' border=0 style='border:none;'> on September 27, 2012, 8:55 pm, in reply to "Re: Audi A5 with 2 fault codes, request schematics"
Alan Lange

I think Ian is talking about this one http://www.flippincool.co.uk/afm1012/

Re: Audi A5 with 2 fault codes, request schematics

Posted by lee hemmings <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3416' width='330' height='300' border=0 style='border:none;'> on September 27, 2012, 10:16 pm, in reply to "Re: Audi A5 with 2 fault codes, request schematics"
Lee Hemmings

Thanks lads for that, think i should post more on here as the info is great.
Next i think i have really investigated the manifold flap code and am happy that the system is capeable of working, therefore think the timing correlation code is the culprit, which i know is possible but cant understand HOW ?
Therefore i am going to scope the cam and crank to see if its a mechanical or electrical, this engine is on a chain which if it as been poorly serviced with cheap oils could have aided wear on the guides.
Any more info help is appreaicated otherwise i will post back when i discover the fault.
Thanks lee

Re: Audi A5 with 2 fault codes, request schematics

Posted by Ian Slattery <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1196' width='330' height='300' border=0 style='border:none;'> on September 27, 2012, 10:46 pm, in reply to "Re: Audi A5 with 2 fault codes, request schematics"
Ian Slattery

Hi Lee

You can subscribe to that free magazine and get a copy in the post.

I agree to start at the cam,crank investigation first.

Have you had a look on here for your engine type.[Its been posted before]

http://www.volkspage.net/technik/ssp/index_eng.php/

Re: Audi A5 with 2 fault codes, request schematics

Posted by lee hemmings <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3416' width='330' height='300' border=0 style='border:none;'> on September 28, 2012, 11:51 am, in reply to "Re: Audi A5 with 2 fault codes, request schematics"
Lee Hemmings

Hi Ian, thanks for that link, it will greatly help me that as i love bed time reading.
I have tried to do the search just now but couldet find it ?
Thanks again

Fixed #

Posted by Lee Hemmings on November 7, 2012, 8:16 am, in reply to " Audi A5 TFSi 2008 - fault codes 4096 & 2968, request schematics #"
Message modified by board administrator November 8, 2012, 3:12 pm

I totally forgot to post the outcome of this, i decided to check the mechanical cam/ crank timing, which is a mission itself. Anyway there was a huge amount of slack in the chain, therefore new balance shaft chain aswell as cam chain, tensioners etc. Job done and pleased with my diagnostic process, as sometimes when a difficult job is presented and finished, i always ask myself could and did i go about the process in a methodical way!

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