9-3 Arc/Aero (9440) L4-2.0L Turbo (2.0 T) (2004)
The engine management system supplies a solenoid valve with a PWM signal. The solenoid valve then allows pressure from the compressor to pass.
When the pressure overcomes the spring force in the diaphragm box the rod will begin to move, opening the wastegate valve a corresponding amount.
As the engine management system varies the PWM signal, the wastegate valve opening will change and the turbine speed can be regulated.
Bypass valve
Accelerator depressed
When the turbocharger is working, pressure builds up in the turbocharger delivery pipe, throttle body and intake manifold. As long as the throttle disc