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Home >> Dodge and Ram >> 2002 >> Durango Base, 5.9 Z, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Emission Systems & Sub-Systems >> Closed Crankcase Ventilation System
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Closed Crankcase Ventilation System

A Closed Crankcase Ventilation (CCV) system is used on vehicles equipped with 2.5L. If engine is equipped with a CCV system, it will not have a Positive Crankcase Ventilation (PCV) Valve. For more information on CCV system and PCV system, see EMISSION SYSTEMS & SUB-SYSTEMS in appropriate THEORY & OPERATION article. If engine is equipped with a PCV system, go to POSITIVE CRANKCASE VENTILATION  .

NOTE: For component location, see COMPONENT LOCATIONS  . For connector identification, see CONNECTOR IDENTIFICATION  . For circuit identification and wiring diagram, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components.
  1. CCV system performs the same function as a conventional PCV system, but does not use a vacuum controlled PCV Valve. CCV system uses a fixed orifice fitting. Ensure locations of fixed orifice fitting and air inlet fitting have not been exchanged. The fixed orifice fitting is located on left front side of the Valve Cover and the air inlet fitting is located on top, at rear of Valve Cover.
  2. Remove fixed orifice fitting from the Valve Cover and leave tube attached. Start engine and allow it to idle. A hissing noise should be heard from fixed orifice fitting. Also, a strong vacuum should be felt with a finger placed at fitting inlet. If vacuum is not present, remove fitting. If vacuum is now present at tube, replace fitting. Do not attempt to clean fitting. If vacuum is not present at tube, go to next step.
  3. Check tube for kinks or obstruction. Clean tube fitting at Intake Manifold, if necessary. A 1/4" drill may be used (by hand) to dislodge any solid particles, and then blown out with shop air. Reinstall fixed orifice fitting and tube. Disconnect air inlet fitting and hose from front of Valve Cover.
  4. Hold a piece of stiff paper loosely over opening in Valve Cover. Allow engine to idle for one minute. Paper should be drawn against rubber grommet in Valve Cover by vacuum in crankcase. If vacuum is not present, check tubes for restrictions or obstructions.
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