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 genetation.
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.
P0048 is set when excessive current is detected in VGT Control solenoid valve control circuit for more than 1 sec.. This code is due to short to battery in control circuit or internal short of VGT Control solenoid valve component.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy | ● Signal monitoring | ● VGT Control solenoid valve circuit ● VGT Control solenoid valve component | ||
Enable Conditions | ● Engine run(monitoring only performed at actuator operating condition) | |||
Threshold Value | ● Short to battery | |||
Diagnostic Time | ● 1000ms | |||
Fail Safe | Fuel Cut | NO | ||
EGR Off | YES | |||
Fuel Limit | YES | |||
Check Lamp | NO | |||
VGT Control solenoid valve component resistance | VGT Control solenoid valve operating Hz | VGT Control solenoid valve operating duty |
14.7 ~ 16.1Ω (20℃) | 300Hz | 75% at idle, decreases as accelerating |
