•  The VBC solenoid valve is controlled by the variable boost control signal (duty signal) from the PCM. The longer the valve is ON, the higher the boost pressure becomes.

•  The PCM performs feedback control by determining the period that the VBC solenoid valve is ON based on the engine speed and the fuel injection amount so that the optimum boost pressure can be obtained.

•  Under driving conditions where more boost pressure is needed, the PCM sends the variable boost control signal to extend the ON period of the VBC solenoid valve, moving the guide blades in the turbocharger in the closing direction.

•  Under driving conditions where less boost pressure is needed, the PCM sends the variable boost control signal to shorten the ON period of the VBC solenoid valve, moving the guide blades in the turbocharger in the opening direction.