9-3 (9440) L4-2.0L Turbo (2007)
Function
When the throttle closes an underpressure is quickly created in the intake manifold by means of combustion, while the overpressure before the throttle
remains. In order to avoid pressure shocks in the intake manifold with subsequent jerking, when the throttle is re-opened the overpressure before the
throttle must be released. The bypass valve signal line, which under normal driving is in connection with the outlet before the throttle, is then instead
connected with the outlet after the throttle by means of a solenoid valve controlled by Trionic.