CAMSHAFT PULLEY CONSTRUCTION [MZI-3.7]

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Construction

• The variable valve timing mechanism consists of the variable valve timing actuator, oil control valve (OCV), input parts for vehicle conditions determination, and the PCM.

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Hydraulic Pressure Flow Diagram

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Component and Function

Variable valve timing actuator | • Continuously modifies the phases of the intake camshaft and crankshaft at the forward end of the intake camshaft using hydraulic pressure from the oil control valve (OCV).
OCV | • Operated by current from the PCM. Switches the hydraulic oil passages to the variable valve timing actuator.
PCM | • Controls the OCV so that optimum valve timing is obtained according to engine operation conditions.

Operation

• Engine oil which is suctioned by the oil pump flows to the variable valve timing actuator via the oil control valve (OCV). The hydraulic pressure applied to the variable valve timing actuator is controlled by the OCV and the relative phase of the camshaft sprocket and camshaft is changed to optimize the valve timing depending on the engine operation conditions.