Idle Speed Vacuum Solenoid Valve: Description and Operation

Idle-Up Vacuum Switching Valve (VSV):

Whenever the ECU senses activation of the air conditioning compressor, the Idle-up VSV is activated to increase base idle speed. The Idle-up VSV is a calibrated air bleed around the throttle valve and feeds air to the engine through vacuum hoses. The Idle-up VSV inputs the ECU through terminal V-ISC.