VARIABLE VALVE TIMING MECHANISM CONSTRUCTION [L3]
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• The variable valve timing mechanism consists of a variable valve timing actuator, oil control valve (OCV), CKP sensor, CMP sensor, and the PCM.
Hydraulic Pressure Flow Diagram
Component and function
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Variable valve timing actuator
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• Continuously modifies the phases of the intake camshaft and crankshaft using hydraulic pressure from the oil control valve (OCV).
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Oil control valve (OCV)
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• Operated by current (duty signal) from the PCM. Switches the hydraulic oil passages to the variable valve timing actuator.
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CKP sensor
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• Inputs engine revolution signal to the PCM.
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CMP sensor
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• Inputs cylinder identification signal to the PCM.
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PCM
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• Controls the oil control valve (OCV) so that optimum valve timing is obtained according to engine operation conditions.
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