VARIABLE VALVE TIMING MECHANISM CONSTRUCTION [MZR 1.6]

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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.

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Hydraulic Pressure Flow Diagram

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Component and function

Variable valve timing actuator	• The phase difference between the variable timing actuator and camshaft on the intake side changes continually based on the hydraulic pressure controlled by the OCV.
OCV	• Operated by current (duty signal) from the PCM. Controls the hydraulic oil passages to the variable valve timing actuator.
CKP sensor	• Inputs engine revolution signal to the PCM.
CMP sensor	• Inputs cylinder identification signal to the PCM.
PCM	• Controls the OCV so that optimum valve timing is obtained according to engine operation conditions.