Boost Pressure Sensor (BPS)
The Boost Pressure Sensor (BPS) is located in the intake air tube between the turbocharger inter cooler and the throttle body. The BPS measures the throttle inlet pressure. The ECM uses the information from the BPS to refine the estimate of the airflow rate through the throttle and to determine the desired boost pressure. The BPS for a speed density system is integrated with the turbocharger inter cooler temperature sensor.
The turbocharger waste gate regulating valve solenoid allows the ECM to control the turbocharger waste gate position. The turbocharger waste gate regulating valve solenoid controls the pressure or vacuum supplied to the pneumatically actuated waste gate diaphragm in order to control the boost pressure limit. When the compressor outlet pressure increases, a pneumatically powered actuator opens the turbocharger waste gate and limits the compressor outlet pressure. The turbocharger waste gate regulating valve solenoid supplies pressure or vacuum to the pneumatically actuated waste gate canister diaphragm, which regulates the boost pressure to the desired value.