Camshaft Actuator System Description: Operation

The PCM operates the CMP actuator solenoid valve by pulse width modulation (PWM) of the solenoid coil. The higher the PWM duty cycle, the larger the change in camshaft timing. Oil pressure that is applied to the advance side of the fixed vanes will rotate the camshaft in a clockwise direction. The clockwise movement of the camshaft will advance the timing. When oil pressure is applied to the return side of the vanes, the camshaft will rotate counterclockwise until returning to 0 degrees.