Variable Induction Control Solenoid: Description and Operation

High Speed Inlet Air System:

The High Speed Inlet Air (HSIA) solenoid controls the vacuum applied to the shutter valve actuator. The HSIA solenoid applies vacuum to the shutter valve at low rpm which holds the shutter valve closed, and vents the shutter valve actuator vacuum to atmosphere above 5000 rpm to allow the shutter valve to open. The HSIA solenoid is controlled by an output signal from the Powertrain Control Module (PCM).