2007 TOYOTA SIENNA Service Repair Manual

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Page 705 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–419
ES
Cut-off valve Located in fuel tank. Valve floats and closes when fuel tank is 100% full.
Purge VSV (Vacuum Switching Valve)Opens or closes line

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–419
ES
Cut-off valve Located in fuel tank. Valve floats and closes when fuel tank is 100% full.
Purge VSV (Vacuum Switching Valve)Opens or closes line between canister and intake manifold. ECM uses purge VSV to control EVAP
purge flow. In order to discharge EVAP absorbed by canister to intake manifold, ECM opens purge
VSV. EVAP discharge volume to intake manifold is controlled by purge VSV duty cycle ratio
(current-carrying time). (Open: ON, Close: OFF)
Refueling valveControls EVAP pressure from fuel tank to canister. Valve consists of diaphragm, spring and
restrictor (diameter: 0.08 inch). When fuel vapor and pressure inside fuel tank increase, valve
opens. While EVAP is purged, valve closes and restrictor prevents a large amount of vacuum from
affecting pressure in fuel tank. Valve is opened while refueling. When valve is open, adding fuel into
fuel tank is possible.
Roll-over valveLocated in fuel tank. Valve closes by its own weight when vehicle overturns to prevent fuel from
spilling out.
Service port Used for connecting vacuum gauge for inspecting EVAP system.
Soak timerBuilt into ECM. To ensure accurate EVAP monitor, measures 5 hours (+/- 15 min.) after ignition
switch is turned off. This allows fuel to cool down, stabilizing Fuel Tank Pressure (FTP). When
approx. 5 hours elapsed, ECM activates.
Canister pump module Consists of (a) to (d) below. Pump module cannot be disassembled.
(a) Vent valveVents and closes EVAP system. When ECM turns valve ON, EVAP system is closed. When ECM
turns valve OFF, EVAP system is vented. Negative pressure (vacuum) is created in EVAP system
to check for EVAP leaks by closing purge VSV and vent valve (closed), and operating vacuum
pump are turned on (refer to fig. 1).
(b) Canister pressure sensorIndicates pressure as voltages. ECM supplies regulated 5 V to pressure sensor, and uses feedback
from sensor to monitor EVAP system pressure (refer to fig 2).
(c) Vacuum pump Creates negative pressure (vacuum) in EVAP system for leak check.
(d) 0.02 inch orificeHas an opening with 0.02 inch diameter. Vacuum is produced through orifice by closing purge VSV,
turning off vent valve and operating vacuum pump, to monitor 0.02 inch leak pressure. 0.02 inch
leak pressure indicates a small leak of EVAP. Component Operation

Page 706 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–4202GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
WIRING DIAGRAM
Refer to DTC P0450 (See page ES-272).
INSPECTION PROCEDURE
NOTICE:
An intelligent tester is required to conduct the following di

Page 707 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–421
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(c) Turn the ignition switch off and wait for 10 seconds.
(d) Connect the intelligent tester to the DLC3.
(e) Turn the ignition switch to the O

Page 708 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–4222GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
NOTICE:
• In the EVAP SYSTEM CHECK (AUTO OPERATION), the
series of 5 EVAP SYSTEM CHECK steps is performed
automatically by the intelligent

Page 709 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–423
ES
NOTICE:
• In the EVAP SYSTEM CHECK (MANUAL OPERATION),
the series of 5 EVAP SYSTEM CHECK steps is
performed manually by the intelligent tes

Page 710 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–4242GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Check the EVAP pressure in step 1/5.
Result
*: The DTCs relating to the EVAP system displayed on
the intelligent tester when checking.
B
A

Page 711 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–425
ES
(a) Check the EVAP pressure in steps 1/5 and 2/5.
Result
*: The DTCs related to the EVAP system are displayed
on the intelligent tester when c

Page 712 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–4262GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
HINT:
Make a note of the pressures checked in steps (a) and (b)
below.
(a) Check the EVAP pressure 4 seconds after the vacuum
pump is activat

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