Toyota 22R-E Service Manual page 420

EG2–143
ENGINE – EMISSION CONTROL SYSTEMS
POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM
To reduce HC emission, crankcase blow–by gas (HC) is routed through the PCV valve to the intake manifold for
combustion in the cylinders.
Engine not Running or Backfiring
Normal Operation
Idling or Decelerating
Acceleration or Heavy Load