Kia Optima: RCV Control Solenoid Valve. Description and OperationWhen the throttle is closed, while the engine is running at cruise rpm (tip-out), the turbocharger boost pressure raises rapidly. The pressure wave strikes a compressor blades causing a knocking noise. To prevent this the ECM opens the recirculation valve which allows excessive boost pressure to vent back to the air cleaner side of the turbocharger compressor.

Adjustment
RCV Control Solenoid Valve. SpecificationsAutomatic Heating and Cooling Control System
Your vehicle is equipped with an automatic heating and cooling control system
controlled by simply setting the desired temperature. ...
Components and Components Location
Components Location
1. Overdrive clutch (OD/C)
2. One way clutch (OWC)
3. Low & Reverse brake (LR/B)
4. Underdrive brake (UD/B)
5. 26 brake(26/B)
6. 35R cl ...
Inspection (With GDS)
1.
Check BCM input/output specification
of multifunction switch using the GDS. If the specification is abnormal,
replace the lamp or wiper switch.
2.
If diagnosis is ...