P0234 is set when real boost pressure is much higher than target boost pressure for more than 15 sec. at over 2000RPM and 15mg/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.
Item | Detecting Condition | Possible Cause | |
DTC Strategy |
•
VGT control solenoid valve circuit monitoring | 1. VGT actuator vacuum hose connection 2. Vacuum ling leak or stuck 3. Faulty VGT 4. Stuck exhaust system | |
Enable Conditions |
•
Engine "ON" (over 2000rpm, fuel qauntity over 15mg/hub) | ||
Threshold Value |
•
Real boost pressure is greater than target boost pressure | ||
Fail Safe | Fuel Cut |
•
NO | |
EGR Off |
•
YES | ||
Fuel Limit |
•
NO | ||
Check Lamp |
•
YES | ||
