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.
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.
The ECM set DTC P2563 if malfunction in VGT control owing to error in VGT operation PWM signal. This code may result from any error in VGT control circuit or VGT control module.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Signal Monitoring
? Faulty VGT actuator.
Enable Conditions
? Engine Running
Threshold Value
? PWM signal failure.
Diagnostic Time
? 25 sec.
Fail Safe
Fuel cut
NO
EGR Off
YES
Fuel Limit
Check Lamp
OFF