Celica Liftback L4-122 1998cc 2.0L DOHC Turbo (3S-GTE) (1992)
Idle Up Control Valve: Description and Operation
A/C Idle-Up Vacuum Switching Valve (VSV)
Whenever the ECU senses activation of the air conditioning compressor, the A/C Idle-up VSV is activated to increase base idle speed. The A/C Idle-up
VSV is a calibrated air bleed around the throttle valve and feeds air to the engine through vacuum hoses. The A/C Idle-up VSV inputs the ECU through
terminal ISCV.