Wastegate Control System Operation Inspection; Variable Valve Timing Control System Operation Inspection - Mazda CX-7 2007 Workshop Manual

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

Wastegate Control System Operation Inspection

If simulation function of M-MDS is used:
1. Start the engine and run it is idling.
2. Disconnect the hose between the wastegate control solenoid valve and the intake pipe.
3. Put a finger to the wastegate control solenoid valve and verify that there is no pressure applied.
• If there is pressure, inspect the following:
— Wiring harness and connectors (Wastegate control solenoid valve— PCM terminal 2AA)
— Wastegate control solenoid valve (Stuck open)
4. Warm up the engine to normal operating temperature.
5. Connect the M-MDS to the DLC-2 and verify that DTC P0245 or P0246 are shown. Perform the DTC
inspection.
(See01-02-112 DTC P0245[L3 WITH TC].)
(See01-02-114 DTC P0246[L3 WITH TC].)
6. Select the VGT PID.
7. Increase the duty value of the wastegate control solenoid valve and inspect if the operation sound of the
solenoid valve is heard.
• If the operation sound is heard, inspect for loose or damaged vacuum hoses. (Wastegate actuator—
wastegate control solenoid valve—intake hose)
• If the operation sound is not heard, perform the wastegate control solenoid valve inspection.
(See01-13-14 WASTEGATE CONTROL SOLENOID VALVE INSPECTION[L3 WITH TC].)
8. Warm up the engine to normal operating temperature.
9. Monitor the VGT and APP PIDs using the M-MDS.
10. Run the engine with the APP PID above 30% and verify that the VGT PID value increases from 0%.
• If the VGT PID is 0%, inspect the APP PID.
If simulation function of M-MDS is not used:
1. Start the engine and run it is idling.
2. Disconnect the hose between the wastegate control solenoid valve and the intake pipe.
3. Put a finger to the wastegate control solenoid valve and verify that there is no pressure applied.
• If there is pressure, inspect the following:
— Wiring harness and connectors (Wastegate control solenoid valve—PCM terminal 2AA)
— Wastegate control solenoid valve (Stuck open)
4. Warm up the engine to normal operating temperature.
5. Connect the M-MDS to the DLC-2 and verify that the DTC P0245 or P0246 are shown. Perform the DTC
inspection.
(See01-02-112 DTC P0245[L3 WITH TC].)
(See01-02-114 DTC P0246[L3 WITH TC].)
6. Warm up the engine to normal operating temperature.
7. Monitor the VGT and APP PIDs using the M-MDS.
8. The hose between the wastegate control solenoid valve and intake pipe is disconnected.
9. Run the engine with the APP PID above 30% and verify that the VGT PID value increases from 0% and there
is pressure applied.
• If the VGT PID is 0%, inspect the TP_REL PID.
• If there is no pressure applied, inspect for the following:
— Wastegate control solenoid valve (Stuck closed)
— Hose connection (Intake hose (turbocharger compressor downstream side) —wastegate actuator—
intake hose (turbocharger compressor upstream side))

Variable Valve Timing Control System Operation Inspection

When idling cannot be continued
1. Remove the oil control valve (OCV) and verify that the spool valve is at maximum retard position.
2. Connect the oil control valve (OCV).
3. Turn the ignition switch to the ON position.
4. Verify that the spool valve is at the maximum retard position.
• If the spool valve is stuck in the advance direction, inspect for the following:
— Short circuit in wiring harnesses or connectors between the oil control valve (OCV) and the PCM.
5. Inspect the variable timing actuator.
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