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Home >> Mazda >> 2018 >> CX-9 Signature >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting - Engine Control >> Engine Control System Operation Inspection >> Hydraulic Variable Valve Timing Control System Operation Inspection >> When idling cannot be continued
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When idling cannot be continued

  1. Connect the M-MDS to the DLC-2 and verify that DTC P2090:00 or P2091:00 is displayed. (See On-Board Diagnostic Test .)
  2. Remove the OCV and verify that the spool valve is at maximum advanced position. (See Oil Control Valve (OCV) Removal/Installation .)
  3. Connect the OCV connector.
  4. Switch the ignition ON (engine off).
  5. Verify that the spool valve is at the maximum advanced position.
    • If the spool valve is stuck in the retard direction, inspect for the following:
      • Short circuit in wiring harnesses or connectors between OCV and PCM
  6. Inspect the hydraulic variable valve timing actuator. (See Hydraulic Variable Valve Timing Actuator Inspection .)
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