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DTC P0234 [MZR-CD (RF Turbo)]

id0102f1806200

DTC P0234 | Turbocharger overboost condition
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DETECTION CONDITION | • PCM monitors intake boost pressure using the boost sensor. If the difference between target intake boost pressure and actual intake boost pressure is above 30.0 kPa {225 mmHg, 8.9 inHg}, PCM determines that the VBC system is over boost condition.
POSSIBLE CAUSE | • Air suction at intake-air system (between MAF sensor and turbo charger) • Boost sensor characteristic malfunction • Guide blade actuator stuck • VBC solenoid valve stuck open • Turbocharger malfunction • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED SERVICE INFORMATION • Check for related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to next step.
No | Go to the next step.
3 | IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P0234 on FREEZE FRAME DATA? | Yes | Go to the next step.
No | Go to troubleshooting procedures for DTC in FREEZE FRAME DATA.
4 | INSPECT AIR SUCTION AT INSTAKE-AIR SYSTEM • Inspect intake-air system for air suction between MAF sensor and turbo charger. • Is there any air suction? | Yes | Repair or replace malfunctioning part, then go to Step 9.
No | Go to the next step.
5 | INSPECT VBC SOLENOID VALVE FOR STUCK OPEN • Inspect VBC solenoid valve. • Is VBC solenoid valve stuck open? | Yes | Replace VBC solenoid valve, then go to Step 9.
No | Go to the next step.
6 | INSPECT GUIDE BLADE ACTUATOR FOR STUCK OPEN • Inspect guide blade actuator. • Is VBC actuator stuck open? | Yes | Replace turbocharger, then go to Step 9.
No | Go to the next step.
7 | INSPECT BOOST SENSOR • Inspect boost sensor. • Is boost sensor normal? | Yes | Go to the next step.
No | Replace the boost sensor, then go to Step 9.
8 | INSPECT TURBOCHARGER • Inspect turbocharger. • Is turbocharger normal? | Yes | Go to the next step.
No | Replace turbocharger, then go to next step.
9 | VERIFY TROUBLESHOOTING OF DTC P0234 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Perform the OBD Drive Mode. (See OBD DRIVE MODE [MZR-CD (RF Turbo)].) • Is PENDING CODE the same as DTC present? | Yes | Replace PCM, then go to next step. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [MZR-CD (RF Turbo)].) • Is there any DTC present? | Yes | Go to applicable DTC troubleshooting. (See DTC TABLE [MZR-CD (RF Turbo)].)
No | Troubleshooting completed.