Supra Turbo
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 Vacuum Switching Valve (VSV) is used to control EVAP system. The Engine Control Module (ECM) operates EVAP VSV which controls the vacuum flow for EVAP operation. For EVAP system and component testing, see SYSTEM/COMPONENT TESTS article.