Chyba P0234 Turbocharger Overboost

[suspi]

Přeji všem hezký den,

opakovaně mi motor 2.2l (114 kW) přešel do nouzového režimu a moje amatérská diagnostika hlásí chybu P0234 - Turbocharger Overboost Condition.

Pochopil jsem to tak, že z nějaké příčiny nefunguje regulace plnícího tlaku turbodmychadla a když na to "šlápnu", tak je tlak příliš velký.

Nevíte někdo v jakém rozsahu se má tlak pohybovat?

Budu vděčný i za tip na servis, který tomu rozumí, nejlépe kolem Prahy.

Díky

R.

[Bed@]

Tady je nejaky info k te tvoji chybe, akorat angl.

VGT(Variable Geometric Turbocharger) is the device which increases the efficiency of turbocharger at low rpm and lasts optimum turbo efficiency at high rpm as varying the cross sectional area through which exhaust gas passes turbocharger impeller. It relieves turbo lag at low speed and increse engine power generation.
Engine speed, APS signal, MAFS and Boost pressure sensor information is inputted to ECM.
ECM actuates vacuum diafragm which controls exhaust gas line as controlling VGT Control solenoid valve duty to maintain optimum state of air compression.

1. Connect Scantool to Data Link Connector (DLC).
2. Warm engine up to normal operating temperature.
3. Turn "OFF" electrical devices and A/C.
4. Monitor "BOOST PRESSURE SENSOR" parameter on the Scantool.
A. Specification : 1000hpa ± 100hpa(VGT actuator : approx. 76%) at idle

1630576023721.gif (23.08 KiB) Zobrazeno 1859 x

1. Check VGT actuator component resistance
(1) IG KEY "OFF", ENGINE "OFF".
(2) Disconnect VGT actuator connector.
(3) Measure the resistance between VGT actuator component terminal 1 and 2.
A. Specification : 14.7 ~ 16.1Ω (20℃)



(4) Is VGT actuator component resistance within the specification?
YES
1) Go to "2.Check VGT actuator operation" as follows.
NO
1) Replace VGT actuator and go to "Verification of Vehicle Repair".


2. Check VGT actuator operation
(1) IG KEY "ON", ENGINE "ON".
(2) Check that VGT actuator operating duty is 76% after warming engine up.
(3) Check if vacuum generates after disconnecting VGT valve vacuum hose.
(4) Check if vacuum generates when decelerating after rapid acceleration (Vacuum must not generates, correct VGT actuator operating duty is 45%).
A. Specification : VGT actuator duty 76% : vacuum generates
VGT actuator duty 45% : vacuum does not generate
YES
1) Go to "Verification of Vehicle Repair".
NO
1) Replace VGT Control solenoid valve and go to "Verification of Vehicle Repair".

※ Repeat this process 2~3 times.

[suspi]

Díky moc za info. Tak jestli jsem to pochopil správně, tak tlak z turba na volnoběh by měl být cca 1000 hPa a při akceleraci stoupne až na cca 2300 hPa, kdy by měl zasáhnout regulátor.