Booster Pressure Control Valve Unit (Turbo Charger Actuator); Booster Pressure Control Valve Unit And Vacuum Modulator - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

Booster Pressure Control Valve Unit (Turbo Charger Actuator)

In order to reduce discharging of hazardous exhaust gas and to avoid the engine's overrun the turbo charger must be
appropriately controlled. The maximum turbo charging pressure must be controlled as excessive increase in the pres-
sure and power output can cause critical damages to the engine. In order to control these, the booster pressure control
valve is installed on the turbo charger.
The difference of the booster pressure control between the existing IDI engine and DI engine is that in IDI engine, booster
pressure of the intake manifold operates the booster pressure control valve connected directly to the turbo charger
whereas in DI engine, the control is achieved by utilizing vacuum modulator (vacuum from a vacuum pump) designed to
control the booster pressure control valve. It operates booster pressure control valve by supplying electrical power to the
vacuum modulator having the amount of air being flown into the HFM sensor from the engine's ECU as the base signal.
Refer to the EGR section in following pages for the function of turbo charger and HFM sensor in exhaust system.

Booster pressure control valve unit and vacuum modulator

Turbo charger booster
EXHAUST SYSTEM
DI ENG SM - 2004.4
Turbo charger booster
vacuum modulator
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
DI04-9
Y220_04012