Code No. P0234: Turbocharger Overboost Condition <Vehicles without variable geometly turbocharger>


FUNCTION



  • The engine-ECU checks whether the boost pressure is not higher than the specified value.

TROUBLE JUDGMENT


Check Condition
  • Engine is running
Judgement Criterion
  • The boost pressure exceeds the abnormality determination value for 3 seconds.

PROBABLE CAUSES



  • Failed the waste gate actuator
  • Failed the engine-ECU

DIAGNOSIS

STEP 1. Check waste gate actuator itself.

  • Check waste gate actuator itself (Refer to GROUP 15 - On-vehicle Service - Waste Gate Actuator Check ).

Q. Is the check result normal?
Go to Step 2.
Replace the waste gate actuator.

STEP 2. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code set?
Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ). After registering the injector identification code, carry out the forcible DPF regeneration. (Refer to GROUP 17 - Emission Control - Diesel Particulate Filter (DPF) System - Forcible DPF Regeneration ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).