Celica Except Calif. Emission Vehicles
The EVAP system prevents fuel tank gasoline vapors from escaping into the atmosphere. Fuel tank gasoline vapors are routed through charcoal canister into intake manifold for combustion in the cylinders. See Fig 1. An EVAP Thermal Vacuum Valve (TVV), mounted in the engine coolant passage, is used to control EVAP system in relation to engine coolant temperature. For EVAP system and component testing, see SYSTEM/COMPONENT TESTS article.