What else cause 0.4-0.5 bar max boost

[shone190]

Output test never worked on my car, I don't know why

I have Vagcom, but my China E-bay cable doesn't work, so I'll go tomorrow to my friend, he has some cable so I can try Vagcom.

[shone190]

OK guys, problem is still here

I just connect Vagcom and do output tests, everything works fine, N75 valve works too

There were no fault codes because I disconnected ECU earlier so everything was cleared.

Is there anything else I can do now when I have Vagcom?

Thanks!

[driftin jo]

OK guys, problem is still here

I just connect Vagcom and do output tests, everything works fine, N75 valve works too

There were no fault codes because I disconnected ECU earlier so everything was cleared.

Is there anything else I can do now when I have Vagcom?

Thanks!

Have you driven it since you had vag com to see if there are any codes ?

[shone190]

Yes, but only for 2 km , I'll try it tomorrow and then connect Vagcom to see if there is some codes. How much I need to drive the car to see some codes, if there is some?

[shone190]

OK guys, here are the fault codes after 10km driving

[vcosmin]

knock sensor, problem, will limit boost , advance, etc.

[driftin jo]

G68 no signal will switch off boost control.
I could be wrong but I think air intake temp short to ground would also result in
the ECU switching off boost control, knock sensor also, although this is intermittent
so may not have limited boost after a ECU reset until it occurred again.

So you have 3 potential boost killers there.

[ADP]

ok mate i have the same problem!when i check the n75 i was conetcted the pipes on the wong side,turn them to right position and the b***h is in the game!anyhow where is located moisture trap on s6 c4 2.2t!im so curious!?

[shone190]

G68 no signal will switch off boost control.
I could be wrong but I think air intake temp short to ground would also result in
the ECU switching off boost control, knock sensor also, although this is intermittent
so may not have limited boost after a ECU reset until it occurred again.

So you have 3 potential boost killers there.

Some news after a few days, only I can say that it's a really nightmare

I solved the problem with IAT sensor, one wire was broken, but it didn't solve the problem with boost. After that I decide to took knock sensor from my other car (URS4) which is working perfect, and after change and off course ECU reset, nothing is changed. Boost is again 0.4 bar.

The only thing that I didn't fix is vehicle speed sensor G68 (My speedo works fine). I don't see where is G68 connected with ECU at all so how could G68 limit the boost?!?!

Where is G68 located at all, so I could disconnect it on my URS4 and see will it limit the boost?

Just to mention that I have done some experiment with URS4. First I disconnected front knock sensor, engine works perfekt, boost is 1bar. After that I disconnected second knock sensor too, again boost 1 bar. Then I connected both sensors, but disconnected MAF sensor, everything works great, boost 1 bar. After that I was so upset so I decided to go home and leave everything for some time.

[Rusty]

Disconnect the MFTS plug and see what happens. Diagnosed a car yesterday with that fault.

G28 code when the engine is off is totally normal.

[driftin jo]

Some news after a few days, only I can say that it's a really nightmare

I solved the problem with IAT sensor, one wire was broken, but it didn't solve the problem with boost. After that I decide to took knock sensor from my other car (URS4) which is working perfect, and after change and off course ECU reset, nothing is changed. Boost is again 0.4 bar.

The only thing that I didn't fix is vehicle speed sensor G68 (My speedo works fine). I don't see where is G68 connected with ECU at all so how could G68 limit the boost?!?!

Where is G68 located at all, so I could disconnect it on my URS4 and see will it limit the boost?

Just to mention that I have done some experiment with URS4. First I disconnected front knock sensor, engine works perfekt, boost is 1bar. After that I disconnected second knock sensor too, again boost 1 bar. Then I connected both sensors, but disconnected MAF sensor, everything works great, boost 1 bar. After that I was so upset so I decided to go home and leave everything for some time.

Sorry, I was thinking about engine speed sensor,(G5), not vehicle speed sensor(G68), ,forgive me, I was very drunk at the time .

[shone190]

G68 fault, not G28 and engine was running, but nevermind

I tried to disconnect MFTS a few months ago and everything was the same, but I'll try it again because don't have any idea what to do except to sell the car

[Rusty]

Sorry, mis read that part...

Good luck with it.

[Jonas_R]

I might be wrong but is not G28 that shows a fault code if the engine is not running?

Then you should properly get the G68 checked out.

[shone190]

Where is G68 located and where is it connected to ECU, so I can disconnect it on my URS4 and see if it's boost limited factor?