Turbocharger Wastegate Regulating Valve Solenoid
The turbocharger wastegate regulating valve solenoid allows the PCM to indirectly control the turbocharger wastegate. The turbocharger wastegate regulating valve solenoid controls the vacuum to a pneumatically powered wastegate actuator in order to control the boost pressure limit. When the PCM commands the turbocharger wastegate regulating valve solenoid to allow the vacuum applied to the pneumatically powered actuator to increase, the turbocharger wastegate opens and the compressor outlet pressure is limited.
The turbocharger wastegate regulating valve solenoid supplies vacuum to the pneumatically powered wastegate actuator diaphragm, which regulates the maximum boost pressure to a constant value. A vacuum greater than 32 kPa (9.45 in-Hg) on the pneumatically powered wastegate actuator opens the wastegate. The turbocharger wastegate regulating valve solenoid can partially vent (reduce) the control vacuum, resulting in increased regulated maximum boost.