VARIABLE VALVE TIMING MECHANISM CONSTRUCTION [LF, L5]

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• The variable valve timing mechanism consists of a variable valve timing actuator, oil control valve (OCV), crankshaft position (CKP) sensor, camshaft position (CMP) sensor, and the PCM.

• For the variable valve timing control, refer to CONTROL SYSTEM, VARIABLE VALVE TIMING CONTROL. (See VARIABLE VALVE TIMING CONTROL OUTLINE [LF, L5].) (See VARIABLE VALVE TIMING CONTROL BLOCK DIAGRAM [LF, L5].) (See VARIABLE VALVE TIMING CONTROL OPERATION [LF, L5].)

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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. Switches the hydraulic oil passages to the variable valve timing actuator.
CKP sensor	• Inputs crankshaft position signal to the PCM.
CMP sensor	• Inputs camshaft position signal to the PCM.
PCM	• Controls the OCV so that optimum valve timing is obtained according to engine operation conditions.