VARIABLE VALVE TIMING MECHANISM CONSTRUCTION [ZJ, ZY]
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Hydraulic Pressure Flow Diagram
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Component and function
Variable valve timing actuator
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• The phase difference between the variable timing actuator and camshaft on the intake side changes continually based on the hydraulic pressure controlled by 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. Controls 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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