System Description

Turbocharger System Operation:

^ The turbocharging system provides pressurized air to the intake air system to increase engine power output. The system uses engine exhaust gas to drive the turbocharger, a small high speed turbine and air compressor assembly.

^ The compressor pumps air through a cooling device (intercooler) to the intake plenum. A compressor bypass valve responds to high vacuum during deceleration, opening to relieve excess system pressure air and accompanying noise.

^ During heavy load or acceleration, boost pressure is controlled by an exhaust gas bypass device (wastegate). An Electronic Control Assembly (ECA) controlled solenoid valve regulates turbo boost pressure applied to the wastegate actuator.

^ If excess boost pressure occurs because of a fault in wastegate or solenoid valve, an overboost warning chime will sound. The chime is activated by the vane airflow meter through the ECA. The knock sensor and knock control unit combine to retard spark advance when engine knocking occurs due to overboost.