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Positive Crankcase Ventilation System

  1. Stuck PCV Valve Check

    Turn ignition off. Verify PCV valve maintenance schedule has been followed. Verify proper PCV valve part number. Verify clean PCV valve. Shake PCV valve. If PCV valve rattles when shaken, reinstall PCV valve and go to next step. If PCV valve does not rattle when shaken, replace PCV valve.

  2. PCV System Check

    Start engine and bring to normal operating temperature. Disconnect closure (fresh air) hose from remote air cleaner or air inlet tube (tube connecting Mass Airflow/Intake Air Temperature (MAF/IAT) sensor and throttle body). Place a stiff piece of paper over the hose end. Wait one minute. If vacuum holds paper in place, PCV system is okay. Reconnect hose. Refer to SYMPTOM DIAGNOSIS in TROUBLE SHOOTING - NO CODES article. If vacuum does not hold paper in place, PCV system is leaking/plugged or EVAP system is leaking. If EVAP emission hose is not connected to PCV hose, check for vacuum leaks/obstructions in PCV system (oil cap, PCV valve, hoses, cut grommets or valve cover bolt torque/gasket leaks). Repair as necessary. If EVAP emission hose is connected to PCV hose, go to next step.

  3. Evaporative Emission System Check

    Disconnect EVAP emission hose at connection to PCV hose (if equipped). Cap the connector. Start engine. Again, place a piece of stiff paper over closure (fresh air) hose end. Wait one minute. If vacuum holds paper in place, PCV system is okay. Go to step  4 under Diagnostic Procedures under DTC P0455 or P1443. If vacuum does not hold paper in place, check for vacuum leaks/obstructions in PCV system (oil cap, PCV valve, hoses, cut grommets or valve cover bolt torque/gasket leaks). Repair as necessary.
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