Wastegate Actuator: Description and Operation

Turbo Wastegate Solenoid:

The intake pressure (boost) is controlled to a correct maximum value by an exhaust bypass valve (wastegate). The valve allows a portion of the exhaust gas to bypass the turbine wheel, thus controlling turbine speed. The wastegate is operated by a spring loaded diaphragm (actuator assembly) that responds to the wastegate solenoid to adjust boost level. The wastegate solenoid is controlled by the Electronic Control Module (ECM).