Toyota 2GR-FE Manual page 566

ES–410
DESCRIPTION
Location of EVAP (Evaporative Emission) System:
Fuel Tank
Air Inlet
Port
ES
Fuel Tank Cap
Recirculation Pipe
EVAP System Circuit:
Intake Manifold
Purge VSV
Restrictor (0.08 inch)
NOTICE:
In this vehicle's EVAP system, turning ON the vent valve does not seal off the EVAP system. To
check for leaks in the EVAP system, disconnect the air inlet vent hose and apply pressure from
the atmospheric side of the canister.
While the engine is running, if a predetermined condition (closed-loop, etc.) is met, the purge VSV is
opened by the ECM and fuel vapors stored in the canister are purged into the intake manifold. The ECM
changes the duty cycle ratio of the purge VSV to control purge flow volume.
The purge flow volume is also determined by the intake manifold pressure. Atmospheric pressure is
allowed into the canister through the vent valve to ensure that the purge flow is maintained when negative
pressure (vacuum) is applied to the canister.
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Refueling Valve
Pump Module
Air Filter
Throttle Valve
Canister
Cut-off Valve
Fuel Tank
Purge VSV (Vacuum
Switching Valve)
Canister
To Purge VSV EVAP
Hose (From Canister)
Air Cleaner
ECM
Air Filter
Refueling Valve
EVAP Hose (To
Throttle Body)
A134243E03
Soak Timer
Canister Pump Module
Fuel Cap
Roll-Over Valve
A122570E03