A93865Purge VSV
EVAP Hose
(To Throttle Body)
EVAP Hose
(From Canister)
Vent ValveCanister
Air Filter
Pump ModulePressure Sensor
Vacuum Pump
Purge Line
Refueling Valve
Fuel Tank
Fuel Cap
Location of EVAP (Evaporative Emission) system:
A93866
EVAP System Circuit
Intake Manifold
Purge VSV
Cut-of f Valve Roll-over Valve
CanisterAir FilterFuel Cap
Service Port
Air Cleaner
Restrictor (0.08 inch)
Refueling Valve Throttle Valve
ECM
Soak Timer
Pump Module (refer to fig. 1)
Fuel Tank 05-318
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
508 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
CIRCUIT DESCRIPTION
While the engine is running, if a predetermined condition (closed-loop, etc.) is met, the purge VSV is opened
by the ECM and stored fuel vapors in the canister are purged to 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 the negative pres-
sure (vacuum) is applied to the canister.
The following two monitors run to confirm appropriate EVAP system operation.
