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Closed Crankcase Ventilation System: Notes

NOTE: On Wrangler 2.5L, manufacturer indicates engine may be equipped with a Closed Crankcase Ventilation (CCV) system or a Positive Crankcase Ventilation (PCV) system. If engine is equipped with a CCV system, it will not have a PCV valve. For more information on PCV system and CCV system, see EMISSION SYSTEMS & SUB-SYSTEMS in THEORY & OPERATION article. If engine is equipped with a PCV system, go to POSITIVE CRANKCASE VENTILATION  . If engine is equipped with CCV system, continue with the following procedure.
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