Idle Up Control Valve: Description and Operation

Idle-Up Vacuum Switching Valve (VSV):

PURPOSE
The A/C idle-up Vacuum Switching Valve (VSV) opens a throttle valve bypass line to maintain idle quality during A/C operation.

LOCATION
The VSV is mounted to the firewall in the engine compartment.

OPERATION
The solenoid is located in-line with a throttle valve bypass hose. When energized by the Electronic Control Module (ECM), air is allowed past the throttle valve, raising the idle speed.