Dtc P0234[L3 With Tc] - Mazda CX-7 2007 Workshop Manual

DTC P0234[L3 WITH TC]

DTC P0234 Turbocharger over boost 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 over boost condition.
MONITORING CONDITIONS
— Engine speed is 2,000 rpm or more.
DETECTION
Diagnostic support note
CONDITION
• This is a continuous monitor (Other).
• The MIL does not illuminate.
• FREEZE FRAME DATA is not available.
• DTCs are stored in the PCM memory.
• Wastegate control solenoid valve malfunction
POSSIBLE
• Vacuum hose looseness or damage
CAUSE
• Improper installation of the vacuum hose
Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has the FREEZE FRAME DATA been
recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related Service Bulletins and/or on-line
repair information availability.
• Is any related repair information available?
3 INSPECT WASTEGATE CONTROL SOLENOID
VALVE
• Inspect the wastegate control solenoid valve.
(See01-13-14 WASTEGATE CONTROL
SOLENOID VALVE INSPECTION[L3 WITH
TC].)
• Is there any malfunction?
4 INSPECT VACUUM HOSE
• Inspect the vacuum hose condition for the
following:
— Looseness
— Damage
— Improper installation
• Is there any malfunction?
5 VERIFY TROUBLESHOOTING OF DTC P0234
COMPLETED
• Make sure to reconnect all the disconnected
connectors.
• Clear the DTC from the PCM memory using
the M-MDS.
• Start the engine.
• Is the same DTC present?
6 VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTCs present?
End Of Sie
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
Yes Go to the next step.
No Record the FREEZE FRAME DATA on the repair order,
then go to the next step.
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.
Yes Replace the wastegate control solenoid valve, then go to
Step 5.
(See01-13-5 INTAKE AIR SYSTEM REMOVAL/
INSTALLATION[L3 WITH TC].)
No Go to the next step.
Yes Repair or replace the suspected part, then go to the next
step.
No Go to the next step.
Yes Replace the PCM, then go to the next step.
(See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)
No Go to the next step.
Yes Go to the applicable DTC troubleshooting.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No DTC troubleshooting completed.
id010239806200
ACTION
01-02–111
01-02