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 Conditions, Judgement Criteria
- Volumetric efficiency is higher than 210 - 230 percent.

OBD-II DRIVE CYCLE PATTERN
None.

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 (MUT-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 - Turbocharger Supercharging 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 On-vehicle 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. Using scan tool MB991958, read the diagnostic trouble code DTC).

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector.

CAUTION: Do a test drive with two passengers in the vehicle and where full throttle acceleration can be made safely.

2. Drive at wide-open-throttle in the 2nd gear at a minimum engine speed of 3,500 rpm.
3. After completing the test drive, read the DTC. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC P1103 set?

YES: Repeat the troubleshooting.

NO: The procedure is complete.