IN-9 INTRODUCTION - GLOSSARY OF SAE AND TOYOTA TERMS TVV Thermal Vacuum Valve Bimetallic Vacuum Switching Valve (BVSV) Thermostatic Vacuum Switching Valve (TVSV) TWC Three-Way Catalytic Converter Three-Way Catalyst (TWC) CCRO TWC+OC Three-Way + Oxidation Catalytic Converter CCR + CCo VAF Volume Air Flow Air Flow Meter VR Voltage Regulator Voltage Regulator VSS Vehicle Speed Sensor Vehicle Speed Sensor (Read Switch Type) WOT Wide Open Throttle Full Throttle WU-OC Warm Up Oxidation Catalytic Converter - WU-TWC Warm Up Three-Way Catalytic Converter Manifold Converter 3GR Third Gear - 4GR Fourth Gear -