Kia 2004.5 Spectra Service Technical Training page 73

2004.5 Spectra Technology
Powertrain
Oil enters the OCV filter from the cylinder block into
the cylinder head passage. The oil then enters the
OCV in the middle spool. Depending upon where the
PCM has commanded the OCV spool valve position, by
duty cycle, motor oil will flow to the exhaust camshaft
and into the CVVT assembly. The oil pushed the
vanes to advance or retard cam angle timing.
Retard When the PCM signals the OCV to retard the Intake
valve timing, the solenoid is de-energized the spool
valve back. This opens the oil feed line to the retard
chamber. It also opens the advance chamber oil line
from the CVVT to drain into the oil pan as oil pressure
from the retard vane rotates and pushes it out.
Hold With the OCV in a hold CVVT position, the spool valve
blocks the oil from entering, draining out of the CVVT.
Advance When the PCM cycles the OCV to advance the Intake
valve timing the valve solenoid is energized pushing
the spool valve forward. This opens the oil feed line to
the advance chamber. It also opens the line to the
retard chamber so oil can drain back into the oil pan
as oil in the advance chamber pushes it out.
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