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Home >> Mazda >> 2004 >> 6 s, 4D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting [Engine Control System (AJ) >> Engine Control System Operation Inspection >> Variable Valve Timing Control System Operation Inspection >> When Idling Can Be Continued - Left Bank
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When Idling Can Be Continued - Left Bank

  1. Disconnect OCV (LH) connector.
  2. Warm up the engine to idle.
  3. Apply the battery voltage to the OCV and verify that the engine idles roughly or stalls.
    • If the engine idles roughly or stalls, inspect the timing belt component (valve timing deviation).
    • If the engine does not idle roughly or stall, go to next step.
  4. Remove the OCV (LH) and perform spool valve operation inspection. (See OIL CONTROL VALVE (OCV) INSPECTION .)
    • If not as specified, inspect the following:
      • OCV (LH)
      • Harnesses and connectors between OCV (LH) and PCM have an open or short circuit.
    • If as specified, inspect the following left bank hydraulic passages for clogging or leakage or both.
      • Oil pressure switch - OCV
      • OCV - camshaft
      • Camshaft internal passage
  5. If they are okay, replace the left bank camshaft pulley (with built-in variable valve timing actuator).
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