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

MONITOR EXECUTION

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

• Turbocharger wastegate solenoid monitor
  

• Mass airflow sensor
  
• Intake air temperature sensor
  
• Barometric pressure sensor
  
• Throttle position sensor
  

DTC SET CONDITIONS

• Volumetric efficiency is more than 190 - 230 percent for 1 second.
  

FAIL-SAFE AND BACKUP FUNCTION

• Fuel is cut in abnormal engine overboost condition.
  

OBD-II DRIVE CYCLE PATTERN

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

• Intake charge pressure failed.
  
• Turbocharger wastegate actuator failed.
  
• Intake charge pressure control system failed.
  
• ECM failed.
  

Refer to GROUP 15, On-vehicle Service - Intake Charge Pressure Check .

	Repair it. Then go to Step 4.

	Go to Step 2.

Refer to GROUP 15, On-vehicle Service - Intake Charge Pressure Control System Check .

	Repair it. Then go to Step 4.

	Go to Step 3.

Refer to GROUP 15, On-vehicle Service - Turbocharger Wastegate Actuator Check .

	Repair or replace it. Then go to Step 4.

	Go to Step 4.

(1)Carry out test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 17 .

	Retry the troubleshooting.

	The inspection is complete.