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.
Engine speed, APS signal, MAFS and Boost pressure sensor information is inputted to ECM.
ECM actuates vacuum diaphragm which controls exhaust gas line as controlling VGT Control solenoid valve duty to maintain optimum state of air compression.
P0299 is set when output value is out of available range(lower than minimum value) for 15 seconds.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Signal monitoring |
•
Booster Pressure Sensor
•
Air leakage of intake system (air intake - air cleaner - intercooler - turbocharger compressor housing)
•
Intake hose disconnection.
•
Intercooler damage.
•
Intake/exhaust system clogging. | ||
Enable Conditions |
•
Engine running (Engine speed : above 2000rpm , Fuel injection quantity : 15mg/st ) | |||
Threshold Value |
•
Output value is output of available range(lower than minimum value). | |||
Diagnostic Time |
•
15000 ms | |||
Fail Safe | Fuel Cut | NO | ||
EGR Off | NO | |||
Fuel Limit | YES | |||
Check Lamp | YES | |||
VGT Control solenoid valve component resistance | VGT Control solenoid valve operating Hz | VGT Control solenoid valve operating duty |
14.7 ~ 16.1Ω (20℃) | 300Hz | 79% at idle, decreases as accelerating |
Fig.1) VGT Control solenoid valve output waveform at 79% duty. Duty decreases as boost pressure increases.
Fig.2) VGT Control solenoid valve duty decreased at acceleration.
