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EC-4                                 EMISSION CONTROL   -   POSITIVE CRANKCASE VENTILATION (PCV)
                                                            SYSTEM


                                                POSITIVE CRANKCASE
                                                VENTILATION (PCV) SYSTEM                                  EC029-05



                             PCV Valve          INSPECTION
                                                1.    REMOVE PCV VALVE
                                                (a)   Disconnect the PCV hose from the PCV valve.
                                                (b)   Remove the PCV valve.

                                       B13197



                                                2.   INSTALL CLEAN HOSE TO PCV VALVE
                                                3.   INSPECT PCV VALVE OPERATION
                                                (a)  Blow air into the cylinder head side, and check that air
                                                     passes through easily.
                                                CAUTION:
                                                Do not suck air through the valve.
                       Clean Hose               Petroleum substances inside the valve are harmful.

        Cylinder Head Side
                                       P02006



                                                (b)   Blow air into the intake manifold side, and check that air
                             Intake Manifold          passes through with difficulty.
                             Side
                                                If operation is not as specified, replace the PCV valve.
                                                4.    REMOVE CLEAN HOSE FROM PCV VALVE
                                                5.    REINSTALL PCV VALVE




                                       P02477



                                                6.  VISUALLY INSPECT HOSES, CONNECTIONS AND
                                                    GASKETS
                                                Check for cracks, leaks or damage.




                                       P12931




2001 SIENNA (RM787U)

                                                                   Author :             Date :              1064

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