Variable Induction Control Actuator: Description and Operation

High Speed Inlet Air (HSIA) Control Solenoid:

The High Speed Inlet Air (HSIA) control solenoid controls the vacuum apply to the inlet air shutter valve actuator. The HSIA solenoid is governed by an output signal from the Electronic Control Assembly (ECA). The HSIA solenoid allows vacuum to apply the shutter valve at low rpm holding the shutter valve closed, and venting the shutter valve actuator vacuum to the atmosphere above 5000 rpm to allowing shutter valve operation.