Variable Valve Timing Solenoid: Description and Operation

Variable Valve Timing (VVT) Solenoid/Shuttle Valve





The VVT solenoid/shuttle valve assembly is bolted to the bush carrier and protrudes through the camshaft cover. Electrical connection to the solenoid is from the engine harness.





The valve timing solenoid controls the position of the shuttle valve relative to the two ports in the bush carrier.
The shuttle valve, depending on its position set by the solenoid at any instant, directs engine oil pressure to either the retard side or the advance side of the piston assembly,
The position of the solenoid/shuttle valve is controlled by a return spring and a 300 Hz pulse-width-modulated signal provided by the ECM.