Savana 3500 V8-4.8L (2009)
1. Pressurized oil enters the retard cavities (2) of the actuator and moves the park pin (3) from the locked position.
2. As pressure increases within the retard cavities (2), the rotor and camshaft rotate counter clockwise retarding valve timing.
3. As the duty cycle decreases, the spool is repositioned and oil is sent to the advance cavities (1), rotating the rotor and camshaft clockwise,
advancing valve timing.
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With a 0 percent duty cycle signal to the magnet, the spool is positioned in the fully extended position and there is full flow to the advance
cavities of the actuator. As duty cycle increases to near 50 percent, flow to the advance cavities is decreased.
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With a 50 percent duty cycle, the spool is positioned neutral, with no flow to either the advance and retard cavities.
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With a 51-100 percent duty cycle, the spool is positioned to provide oil flow to retard cavities. As the duty cycle increases, the flow to retard
cavities increases.
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With a 100 percent duty cycle, there is full flow to the retard cavities of the actuator.
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The above duty cycle percentage values are only a guideline, as the actual duty cycle values may vary based on engine oil temperature,
solenoid magnet coil temperature, magnet coil resistance, and other specifics.
CMP Actuator Park Position Verification
