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 increase engine power generation.

The electronic VGT adapted on S engine is activated by VGT actuator control unit and electronic actuator integrated with DC motor. Engine speed, APS signal, MAFS and Boost pressure sensor data are inputted to ECM. ECM controls VGT actuator control unit to control exhaust gas line as controlling VGT actuator duty to maintain optimum state of air compression. VGT actuator control unit controls DC motor with those signal so that exhaust gas can pass through the vane more or less cross sectional with operating spear gear→outter crank→ inner crank→main link→ unison ring→inner vane in order.

VGT actuator control unit judges that actuator is faulty by feed back signal of actuator position from turbo charger position sensor. If it is detected, VGT actuator control unit notifies faulty to ECM. The electronic actuator is much faster in operating response and stable in control than vacuum type.

warning

In case of replacing E-VGT, perform the "COMPONENT CHANGE ROUTINE" procedure with scan tool. If the "COMPONENT CHANGE ROUTINE" procedure has not completed until automatic learning completed, it may cause vehicle performance and exhaust gas problem.

DTC Description

The ECM set DTC P2263 if excessive difference between modeled and actual value of VGT has been detected for 25 sec. This code may result from malfunction of VGT actuator, overload, or error in teaching procedure.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

Signal Monitoring

Overload.

Error related VGT actuator learning.

Faulty VGT actuator.

Enable Conditions

Engine Running

Threshold Value

Faulty following target value

Overload.

Error related learning.

Diagnostic Time

25 sec.

Fail Safe

Fuel cut

NO

-

EGR Off

YES

Fuel Limit

NO

Check

Lamp

OFF

Diagnostic Circuit Diagram
Signal Waveform & Data

Fig.1) VGT operating signal and Feed-back signal at idle.

Fig.2) VGT operating signal and Feed-back signal at 4000RPM.

Яндекс.Метрика