| P0234 | Turbocharger over boost condition |
|---|---|
|
DETECTION CONDITION
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• Permanent Bypass Air governor deviation – Negative governor deviation below limit
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|
POSSIBLE CAUSE
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• Air suction at intake-air system (between MAF sensor and turbocharger)
• MAP sensor characteristic malfunction
• Variable boost control valve actuator struck
• Variable boost control solenoid valve stuck open
• Turbocharger malfunction
• PCM malfunction
|
Diagnostic procedure
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
|
1
|
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has the 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
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VERIFY REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
|
Yes
|
Perform repair or diagnosis according to the available repair information.
If the vehicle is not repaired, go to the 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 the troubleshooting procedures for DTC in FREEZE FRAME DATA.
|
||
|
4
|
INSPECT AIR SUCTION AT INTAKE-AIR SYSTEM
• Inspect the intake-air system for air suction between MAF sensor and turbocharger.
• Is there any air suction?
|
Yes
|
Repair or replace the malfunctioning part, then go to Step 9.
|
|
No
|
Go to the next step.
|
||
|
5
|
INSPECT VARIABLE BOOST CONTROL SOLENOID VALVE FOR STUCK OPEN
• Inspect the variable boost control (VBC) solenoid valve.
• Is the variable boost control (VBC) solenoid valve stuck open?.
|
Yes
|
Replace the variable boost control solenoid valve, then go to Step 9.
|
|
No
|
Go to the next step.
|
||
|
6
|
INSPECT VARIABLE BOOST CONTROL ACTUATOR FOR STUCK
• Inspect the variable boost control actuator.
• Is the variable boost control actuator stuck?
|
Yes
|
Replace the turbocharger, then go to Step 9.
|
|
No
|
Go to the next step.
|
||
|
7
|
INSPECT MAP SENSOR
• Inspect the MAP sensor.
• Is the MAP sensor normal?
|
Yes
|
Go to the next step.
|
|
No
|
Replace the MAP sensor, then go to Step 9.
|
||
|
8
|
INSPECT TURBOCHARGER
• Inspect the turbocharger.
• Is the turbocharger normal?
|
Yes
|
Go to the next step.
|
|
No
|
Replace the turbocharger, then go to the next step.
|
||
|
9
|
VERIFY THAT DTC P0234 TROUBLESHOOTING IS COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS.
• Start the engine and warm-up to normal operating temperature.
• Run the vehicle under the FREEZE FRAME DATA stored condition.
• Retrieve the DTC using the M-MDS.
• Is the PENDING CODE for this DTC present?
|
Yes
|
Replace the PCM, then go to the next step.
|
|
No
|
Go to the next step.
|
||
|
10
|
VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
• Are any DTCs present?
|
Yes
|
Go to the applicable DTC inspection.
|
|
No
|
DTC troubleshooting completed.
|
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