P0234

DTC P0234: Turbocharger Wastegate System Malfunction

TECHNICAL DESCRIPTION
- The ECM checks that the engine is not overcharged 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)
- Volume airflow sensor
- Intake air temperature sensor
- Barometric pressure sensor
- Throttle position sensor

DTC SET CONDITIONS

Logic Flow Chart:

Logic Flow Chart

Check Condition, Judgment Criterion
- Volumetric efficiency is higher than 210 - 230 percent.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 16. OBD-II Drive Cycle Pattern Lists

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

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991911: Main Harness B

STEP 1. Check the intake charge pressure.

Refer to, On-vehicle Service Intake Charge Pressure Check in Intake and Exhaust/Testing and Inspection/Non-Trouble Code Procedures.

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, On-vehicle Service Intake Charge Pressure Check in Intake and Exhaust/Testing and Inspection/Non-Trouble Code Procedures.

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 Diagnostic Function - OBD-II Drive Cycle - Pattern 16. OBD-II Drive Cycle Pattern Lists
2. Check the diagnostic trouble code (DTC).

Q: Is the DTC P0234 set?

YES: Retry the troubleshooting.

NO: The inspection is complete.