Circuit/System Description
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The position of the turbocharger vanes is controlled by the engine control module (ECM). The ECM commands the TC vane position solenoid to change the position of vanes in order to vary boost depending upon the load requirements of the engine. The TC vane position sensor provides the ECM with a signal voltage relative to position of the turbocharger vanes.