Prevents release of blow-by gas (unburnt gas) into the atmosphere.
The intake manifold vacuum introduces blow-by gas to the intake manifold via the PCV valve and the ventilation hose.
The positive crankcase ventilation system consists of the following parts:
| Part name | Reference |
| PCV valve | (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE [SKYACTIV-G 2.5].) |
| Ventilation hose | ― |