Component Location
General Description

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 data are inputted to ECM. ECM actuates vacuum diafragm which controls exhaust gas line as controlling VGT actuator duty to maintain optimum state of air compression.

DTC Description

P0234 is set when real boost pressure is much lower than target boost pressure for more than 15 sec. at above 1750RPM and 10~22mg/hub of fuel injection quantity. This code is due to poor connection of VGT solenoid valve vacuum hose, vacuum leakage, clogging, VGT turbo charger component failure.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● Signal monitoring

● VGT solenoid component

● VGT vacuum line

● VGT turbo charger component

Enable Conditions

● Engine running (at above 1750RPM and 10~22mg/hub of fuel injection quantity)

Threshold Value

● Real boost press. is much higher than target boost press.

Diagnostic Time

● 15 sec.

Fail Safe

Fuel Cut

NO

EGR Off

YES

Fuel Limit

YES

Check Lamp

ON

Specification

VGT Actuator Component Resistance

VGT Actuator Operating Hz

VGT Actuator Operating Duty

14.7 ~ 16.1Ω (20℃)

300Hz

76% at idle, decreases as accelerating

Schematic Diagram
note
To view Flash content, you need to install the appropriate browser extension
Signal Waveform
Яндекс.Метрика