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Airflow Inspection

1.Remove the charge air cooler cover. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L3 Turbo].)

2.Disconnect the section (A) of the ventilation hose shown in the figure.

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3.Start the engine and verify that vacuum is applied to the end of the disconnected ventilation hose while the engine is idling.

• If vacuum does not occur in the ventilation hose, perform the procedure from Step 4.

Note

• If the PCV valve is operating normally, vacuum occurs in the ventilation hose, however, if there is a malfunction in the PCV valve, positive pressure occurs in the ventilation hose because the blow-by gas is circulated to the air hose from the ventilation hose.

• Verify the ventilation hose vacuum using the following methods:

― When the tip of your finger touches the end of the ventilation hose, it is suctioned by the hose.

― When a thin scrap of paper contacts the end of the ventilation hose, it is suctioned by the hose.

4.Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [L3 Turbo].)

5.Remove the intake manifold. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L3 Turbo].)

6.Remove the PCV valve and the oil separator as a single unit. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L3 Turbo].)

7.Verify that there is no airflow when pressure is applied to port B.

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• If there is airflow, replace the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L3 Turbo].)

8.Verify that there is airflow when vacuum is applied to port B.

• If there is no airflow, replace the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L3 Turbo].)