Camshaft Position Actuator System

WARNING: This page is about a different variant/trim than selected.

The camshaft position actuator system is an electro-hydraulic operated device used for a variety of engine performance and operational enhancements. These enhancements include lower emission output through exhaust gas dilution of the intake charge in the combustion chamber, a broader engine torque range, and improved fuel economy. The camshaft position actuator system accomplishes this by, changing the angle or timing of the camshaft, relative to the crankshaft position. The camshaft position actuator simply allows earlier or later intake and exhaust valve opening, during the four stroke engine cycle. The camshaft position actuator cannot vary the duration of valve opening, or the valve lift.

During engine OFF, engine idling, and engine shutdown conditions, the camshaft actuator is held in the park position. Internal to the camshaft position actuator assembly is a return spring and a locking pin. During non-phasing modes of the camshaft, the return spring rotates the camshaft back to the park position, and the locking pin retains the camshaft position actuator sprocket to the camshaft. The engine control module (ECM) can only command the camshaft position actuator to retard the valve timing from the park position, or advance the valve timing back to the park position.