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COMPONENT OPERATION CHART Component Operation Canister Contains activated charcoal to absorb EVAP (Evaporative Emissions) generated in Cut-off valve Located in fuel tank. Valve floats and closes when fuel tank 100% full. Purge VSV Opens or closes line between canister and intake manifold. ECM uses purge VSV to Refueling valve Controls EVAP pressure from fuel tank to canister. Valve consists of diaphragm, Roll-over valve Located in fuel tank. Valve closed by its own weight when vehicle overturns to Soak timer Built into ECM. To ensure accurate EVAP monitor, measures 5 hours (+/-15 min.) Canister pump Consists of (a) to (d) below. Canister pump module cannot be disassembled. (a) Vent valve Vents and closes EVAP system. When ECM turns valve ON, EVAP system closed. (b) Canister Indicates pressure as voltages. ECM supplies regulated 5 V to canister pressure sensor, (c) Leak detection Creates negative pressure (vacuum) in EVAP system for leak check. (d) Reference Has opening with 0.02 inch diameter. Vacuum produced through orifice by closing
2008 Toyota Tundra 2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
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