Circuit Description

Under most conditions, PCM commands boost control solenoid to operate at a 100 percent duty cycle (on) to allow full intake boost pressure upon demand. However, if reverse gear is selected, PCM detects rapid deceleration or engine load is extremely high, reduced boost is desired. Under these conditions, PCM commands boost control solenoid to operate at a zero percent duty cycle (off), which opens by-pass valve to reduce boost pressure by recirculating it back through supercharger inlet.