![]() ![]() In this state the engine control module monitors the system and waits for the engine speed and load conditions to be right for VVT activation. Pressurized engine oil is still being supplied to the oil control valves but it is bypassed and directed back into the oil pan. In the default position the VVT solenoids are not energized, and the actuators are commonly locked into their home position by a locking pin or spring. When the VVT system is not activated the engine runs in its default or base timing position. Most VVT systems are not activated at idle and start adjusting valve timing at higher engine speeds. Engine control module: The module responsible for monitoring and controlling the VVT system as well as the engine.It is common for multiple camshaft position sensors to be used on VVT systems that phase multiple camshafts. Camshaft and Crankshaft position sensors: Used by the engine control module to monitor and control valve timing location.Engine oil passages: Passages throughout the engine block, cylinder heads and camshaft that allows engine oil to flow to VVT system components.It is used on some vehicles to confirm VVT operation. VVT oil pressure switch: A normally open switch that closes from oil pressure when the VVT system is activated. ![]() This device is normally part of the VVT solenoid on overhead cam engines
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