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DTC P0234 [L3 Turbo]

id0102b7806200

DTC P0234 | Turbo/supercharger overboost condition
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DETECTION CONDITION | • If the manifold absolute pressure or charging efficiency are more than the specification for the specified period of time, the PCM determines that the turbocharger is in an overboost condition. MONITORING CONDITIONS - Engine speed is 2,000 rpm or more. Diagnostic support note • This is a continuous monitor (Other). • The MIL does not illuminate. • FREEZE FRAME DATA is not available. • DTCs are stored in the PCM memory.
POSSIBLE CAUSE | • Wastegate control solenoid valve malfunction • Vacuum hose looseness or damage • Improper installation of the vacuum hose

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS 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 REPAIR INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service information. If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | INSPECT WASTEGATE CONTROL SOLENOID VALVE • Inspect the wastegate control solenoid valve. (See WASTEGATE CONTROL SOLENOID VALVE INSPECTION [L3 Turbo].) • Is there any malfunction? | Yes | Replace the wastegate control solenoid valve, then go to Step 5. (See INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L3 Turbo].)
No | Go to the next step.
4 | INSPECT VACUUM HOSE • Inspect the vacuum hose condition for the following: - Looseness - Damage - Improper installation • Is there any malfunction? | Yes | Repair or replace the suspected part, then go to the next step.
No | Go to the next step.
5 | VERIFY TROUBLESHOOTING OF DTC P0234 COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L3 Turbo].)
No | Go to the next step.
6 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [L3 Turbo].) • Are any DTCs present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [L3 Turbo].)
No | DTC troubleshooting completed.