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Home >> Mazda >> 2007 >> 3 Mazdaspeed, 2.3 M >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting (L3 With TC) >> Engine Control System Operation Inspection >> Variable Valve Timing Control System Operation Inspection >> When idling can be continued >> If simulation function of M-MDS is used:

If simulation function of M-MDS is used:

  1. Warm up the engine to normal operating temperature.
  2. Connect the M-MDS to the DLC-2.
  3. Start the engine and run it is idling.
  4. Select the VT DUTY1 PID.
  5. Increase the oil control valve (OCV) duty value and verify that the engine idles roughly or stalls.
    • If as specified, inspect the timing belt component (valve timing deviation).
    • If not as specified, go to the next step.
  6. Remove the oil control valve (OCV) while the connector is connected.
  7. Turn the ignition switch to the ON position.
  8. Select VT DUTY1 PID.
  9. Increase the oil control valve (OCV) duty value and verify that the spool valve operates in the advance direction.
    • If as specified, inspect the following hydraulic passage for clogging and/or leakage.
      • Oil pressure switch - oil control valve (OCV)
      • Oil control valve (OCV) - camshaft
      • Camshaft internal passage
    • If not as specified, inspect the following:
      • Oil control valve (OCV) operation
      • Harness and connectors for open or short circuit (Oil control valve (OCV) - PCM terminal 2AF)
  10. If they are normal, replace the intake camshaft pulley (with a built-in variable valve timing actuator).
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