Grand Prix V6-3.8L SC VIN 1 (1997)
Boost Solenoid: Description and Operation
CIRCUIT DESCRIPTION
Under most conditions, the PCM commands the boost control solenoid to operate at a 100% duty cycle (ON) to allow full boost pressure upon
demand. However, if reverse gear is selected or the PCM detects rapid deceleration or engine load is extremely high, reduced boost pressure is
desired. Under these conditions, the PCM commands the boost control solenoid to operate at a 0% duty cycle (OFF), which opens the bypass
valve. With the Bypass valve open, boost pressure is reduced by recirculating intake air back through the supercharger inlet.
OPERATION
The solenoid valve attached to the bypass actuator is an electronically controlled three-way valve. This valve controlled by the Powertrain Control
Module (PCM), determines weather pressure from the manifold is routed to the bypass actuator or closed off. The valve allows pressure from the
manifold to open the bypass valve and regulate boost pressure during specific driving conditions.
