Turbochargers and superchargers are pumps that force the engine air to increase power. In the case of turbochargers they are driven by exhaust and superchargers are expelled from the crankshaft of the engine through a belt.
Many vehicles use variable geometry turbochargers. This turbo model has blades that are adjustable. They are located outside the turbine, which can be opened or closed to vary the amount of boost pressure. In this way, the turbo can be controlled by the engine speed in an independent manner. The position of the pallets is controlled by the Powertrain Control Module (PCM) through an electronic control solenoid. The position of the pallets is determined by a position sensor.
On the other hand, vehicles that use a fixed displacement turbocharger, the impulse is controlled by a discharge valve. This valve proceeds to open to relieve the reinforcing pressure. The PCM monitors this system by means of a booster pressure sensor.
Regardless of the type of turbocharger used by the vehicle, DTC code P0045 OBDII is configured when the PCM encounters an opening in the booster control solenoid circuit.