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Home >> Mazda >> 2008 >> CX-7 Touring, 2.3 L, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting [Engine & Fuel) >> Engine Control System Operation Inspection [L3 With TC] >> Wastegate Control System Operation Inspection

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.

    (See DTC P0245[L3 WITH TC] ).

    (See 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.

      (See 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.

    (See DTC P0245[L3 WITH TC] ).

    (See 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))
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