P0234
DTC P0234: Turbocharger Wastegate System MalfunctionTECHNICAL DESCRIPTION
- The ECM checks that the engine is not over-charged by always monitoring intake air volume.
- The ECM protects the engine by shutting off fuel when an overcharged condition is detected.
DESCRIPTIONS OF MONITOR METHODS
It detects overcharging failure by monitoring intake air volume.
MONITOR EXECUTION
Continuous
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
- Turbocharger wastegate solenoid monitor
Sensor (The sensor below is determined to be normal)
- Mass airflow sensor
- Intake air temperature sensor
- Barometric pressure sensor
- Throttle position sensor
DTC SET CONDITIONS
Logic Flow Chart:
Check Condition, Judgement Criterion
- Volumetric efficiency is higher than 240 - 260 percent.
FAIL-SAFE AND BACKUP FUNCTION
- Fuel is cut in abnormal engine overboost condition.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function-OBD-II Drive Cycle-Pattern 17. OBD-II Drive Cycle
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Turbocharger wastegate actuator failed.
- Charging pressure control system failed.
- ECM failed.
DIAGNOSIS
STEP 1. Check the intake charge pressure.
Refer to Intake and Exhaust, On-vehicle Service-Intake Charge Pressure Check.
Q: Are there any abnormalities?
YES : Repair or replace it. Then go to Step 3.
NO : Go to Step 2.
STEP 2. Check the charge pressure control system.
Refer to Intake and Exhaust, On-vehicle Service-Intake Charge Pressure Control System Check.
Q: Are there any abnormalities?
YES : Repair or replace it. Then go to Step 3.
NO : Go to Step 3.
STEP 3. Test the OBD-II drive cycle.
1. Carry out test drive with the drive cycle pattern. Refer to MFI Diagnostic Function-OBD-II Drive Cycle-Pattern 17. OBD-II Drive Cycle
2. Check the diagnostic trouble code (DTC).
Q: Is the DTC P0234 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.