Circuit/System Description

The Engine Control Module (ECM) performs the turbocharger learn procedure automatically when the enabling criteria have been met. After each ignition cycle, and before the enable criteria have been met, the ECM will use the previously learned value. If the ECM does not have a previously learned value, it will default to a stored calibrated value.

The ECM commands the turbocharger vane control solenoid to position the turbocharger vanes, and a turbocharger vane position sensor monitors the actual position of the vanes. The ECM varies the boost dependant upon the load requirements of the engine.