Boost Pressure Control: Limit Exceeded

Thursday, February 16, 2017, 12:18:35:03167
VCDS, a Windows-based VAG/VAS emulator, runs on Windows 8 x64.
VCDS Version: RKS 16.8.3.4
Data as of: 20161130 DS267.0
http://shop.dieselschrauber.de


Mileage: Repair Order: T5Log



"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Ein leichter Wind weht durch die Bäume, und die Blätter rascheln leise. Es ist ein wunderschöner Tag, um draußen zu sein."
"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Ein leichter Wind weht durch die Bäume, und die Blätter rascheln leise. Es ist ein wunderschöner Tag, um draußen zu sein."


Address 01: Engine Control Module
Label file: DRV\070-906-016-AXD.clb
Control unit part number: 070 906 016 AJ Hardware: 028 101 156 8
Component and/or version: R5 2.5L EDC G000AG 7002.
Encoding: 0001075
Operating number: WSC 51411 123 80768
VCID: 58B845EDE81F3482D9-5164
"One error found:"

16618 - Charge pressure control.
P0234 - 000 - Limit exceeded.
Environmental conditions:
Speed: 2520 RPM
Torque: 363.6 Nm
Speed: 88.0 km/h
Last: 75.3%
Voltage: 14.21 V
Binary value: 00001000
Pressure: 2162.4 mbar.
Pressure: 2590.8 mbar.


Readiness: 0 0 X X X


Habe euch hier einmal die Log Datei mit eingefügt. Leider finde ich den Fehler nicht. Vermutung war, dass das VTG Gestänge nicht oder zumindest zum Teil fest sitzt. Kann aber weitestgehend ausgeschlossen werden. Bewegung ist da nur hatte ich heute wenig Zeit und werde danach morgen nochmal genau schauen. AGR ist in Ordnung (via VCDS geprüft). Unterdruckleitungen sind auch ohne Risse oder sonstige Schäden. N75 ebenfalls okay. LMM is new.

"If the car has an automatic transmission, it will eventually trigger an error and switch to a limp mode when driven at full throttle. Turning the ignition off and on again provides a temporary fix until the next time it's driven at full throttle."

At approximately 2,500 RPM, the actual boost pressure starts to deviate from the target value. At 4,000 RPM, the deviation is already 500 mbar.

It's important to mention that the turbo was replaced some time ago. Apparently, the previous replacement was "bad," as the colleague said, and someone from Bulgaria then installed a "new" turbo. This one ran for 3000 km in four months without any problems until the issue started recently.
Unfortunately, I'm not sure what's actually true about all of that.


Tomorrow, I'm going to spend the evening working late into the night, but I wanted to show you the log file and ask if you have any suggestions before I end up wasting hours troubleshooting again like I did today.


Best regards,
Rene.

Okay, something else I should mention is that I did a VTG gymnastics test with a VCDS, and I got readings of 989 mBar and 1122 mBar. However, the difference seems quite small to me.
Should I continue to focus primarily on the VTG shaft?

gross.rene wrote:

Oh, and perhaps it's worth mentioning that I did a VTG gymnastics test with VCDS, and I got readings of 989 mBar and 1122 mBar. However, the difference seems quite small to me. Do you think I should continue to focus my main efforts on the VTG

?

Hi,

im Leerlauf? Normal.
You have written a lot and said little. How about you write whether the boost pressure deviates upwards or downwards?
Okay, it's probably increasing, even though the error message doesn't specify which value is the setpoint and which is the actual value.

Check:
I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.

Best regards, Rainer.

I'm sorry, you're right.
As you mentioned, the exhaust deflects upwards. At 4000 RPM when stationary, we're already at 2 bar of boost pressure. Deviations start at 2500 RPM. Everything works fine when stationary. The problem only occurs during driving under full load, and then it goes into limp mode.

Hi there.

I spontaneously thought of:

"Has the variable geometry (VTG) component been changed? Was it modified in the "new" Turbo? Otherwise, the VTG adjustment mechanism in the turbine itself is also prone to problems and can sometimes get stuck."
Then the only solution is to disassemble and clean it. The behavior can vary depending on whether it's cold or warm.

Theoretically, the boost pressure sensor could also provide incorrect readings. However, if the error only occurs sporadically, this is less likely.

Hi,

Based on the background information, I'm leaning towards "rebuilt turbocharger with cheap parts." It's usually the same story: an inexperienced person buys Chinese replacement parts for the turbocharger and then thinks they're a turbocharger expert.

Best regards, Rainer.