Re. Fault code 2224 / MC2-engine

[Robert Myers]

*This message was transferred with a trial version of CommuniGate(r) Pro*


Several possibilities come to mind.

For starters, the ECU is pretty much indestructible if kept dry.

Failing kitty causing exhaust system blockage. This could result in 
sluggish behavior.
Failing fuel pump producing enough fuel pressure for the engine to 
start and run reasonably well but insufficient to provide fuel for 
REAL performance. Blocked hose to lower WG chamber (in the AAN engine).
Leaking ignition wire insulation causing a weak spark insufficient to 
fire a high boost engine charge (in engines w/o COP ignition system).
Torn WG diaphragm.
Failing WGFV.
Significant induction system leaks.
Failing coil.
Wrong plugs.

These are just a few things to examine for starters.

True overboost normally results in acceleration like a banshee 
followed by the brick wall effect of overboost cutout.


At 11:23 PM 10/1/2010, Ben Swann wrote:
>*This message was transferred with a trial version of CommuniGate(r) Pro*
>Well this does not make sense - if there is an overboost condition, 
>normally the engine
>would be running like gangbusters and then cut the fuel.
>
>The chip you have has been modified to allow an extended range of the pressure
>transducer voltage beyond stock rating of 2 bar.  The stock cutout 
>is around 1.55 bar
>and a typical 1.8 bar chip such as the QLCC chip is programmed to 
>cutout at 1.95 bar.
>The 2+T chip basically extends the range a little farther, but 
>basically works similarly
>as many other chips.  The timing map has been adjusted to reflect 
>the higher boost and
>some other changes are in there.
>
>This chip has been well tested and does not cause the problem you 
>describe.  The ECU
>may be throwing the code because it perceives an overboost condition 
>and the question is
>why.  The Manifold Pressure is measured at the port on the 
>ECU.  There must be some
>condition where the ECU sees a relatively high pressure, but the 
>engine is not using the
>boost or constrained.   Since the chip is designed to cut the fuel 
>pump at somewhere
>over 2 bar, then why is the engine  running sluggish?
>
>Perhaps there is a restriction in the exhaust - still does not make 
>a lot of sense.
>
>Perhaps there is an electical component failing in the ECU and there 
>is not really high
>pressure at all, but the ECU is otherwise adjusting fuel and timing 
>because it thinks
>so.
>
>I have not heard this problem before and would be interested in 
>knowing what is causing
>it.
>
>You can disconnect/bypass the wastegate frequency valve (N75) and 
>just run on spring
>pressure alone.  If using the 1.8 bar spring then the pressure 
>should peak at 1.8 bar
>without assist from the WGFV.
>
>What is the boost guage reading?  What is the digital readout in the 
>instrument cluster?
>
>Does the code recur after clearing?  Any other codes?
>
>Ben
>
>
>[Date: Thu, 30 Sep 2010 22:34:42 +0200
>From: Dag B?sterud <dag.boesterud at consulgranada.net>
>Subject: Fault code 2224 / MC2-engine
>To: <quattro at audifans.com>
>Message-ID: <000901cb60de$e9bff9f0$6400a8c0 at dagc22fb907b23>
>Content-Type: text/plain;       charset="iso-8859-1"
>
>I have been troubled with an engined that won't perform; it misfires 
>and feels sluggish
>over 4-4500 rpms. I have replaced all kinds of sensors, hoses, spark 
>plugs; you name it,
>I've done it.
>Tonight I suddenly got a fault code; 2224.
>
>2224 (Blink Fault Code), VAG1551/2 Fault Code Number 00544 Over 
>boost condition(1989-91
>200TQ, 1989-91 200T) UK MB engine. Boost pressure exceeded 1.6 bar 
>for MC, 1.8 bar for
>MB Waste gate or pressure hose, Waste Gate Solenoid/hose problem
>
>My ECU is chipped from Ben Swann.
>
>Will this mean that my N75-valve is malfunctioning?
>
>/Dag
>1990 Audi 100 Turbo Quattro Sport Exklusiv]
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