2001 TOYOTA SEQUOIA Service Repair Manual

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Page 665 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±463
657 Author: Date:
2005 SEQUOIA (RM1146U)Components
Operations
CanisterContains activated charcoal to absorb EVAP (Evaporative Emissions) generated in fuel tank.
Cut±o

± DIAGNOSTICSENGINE
DI±463
657 Author: Date:
2005 SEQUOIA (RM1146U)Components
Operations
CanisterContains activated charcoal to absorb EVAP (Evaporative Emissions) generated in fuel tank.
Cut±off valveLocated 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 controlled by purge VSV duty cycle ratio (current±carrying time). (Open: ON, Close: OFF)
Refueling valve
Controls 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 purged, valve closes and re-
strictor prevents large amount of vacuum from affecting pressure in fuel tank. Valve opened while refueling. When valve
open, adding fuel into fuel tank possible.
Roll±over valveLocated in fuel tank. Valve closes by its own weight when vehicle overturns to prevent fuel from spilling out.
Service portUsed for connecting vacuum gauge for inspecting EVAP system.
Soak timerBuilt into ECM. To ensure accurate EVAP monitor, measures 5 hours* after ignition switch turned to OFF. This allows
fuel to cool down, stabilizing Fuel Tank Pressure (FTP). When approx. 5 hours
* elapsed, ECM activates.
Pump moduleConsists of (a) to (d) below. Pump module cannot be disassembled.
(a) Vent valve
Vents and closes EVAP system. When ECM turns valve ON, EVAP system closed. When, ECM turns valve OFF, EVAP
system vented. Negative pressure (vacuum) created in EVAP system to check for EVAP leaks by closing purge VSV,
turning on vent valve (closed) and operating vacuum pump (refer to fig. 1).
(b) 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 pumpCreates negative pressure (vacuum) in EVAP system for leak check.
(d) 0.02 inch orificeHas opening with 0.02 inch diameter. Vacuum 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 small leak of EVAP.
HINT:
*:If the engine coolant temperature is not below 35C after 5 hours after the ignition switch is turned off, the
monitor check starts 2 hours later. If it is still not below 35C 7 hours after the ignition switch is turned off,
the monitor check starts 2.5 hours later.

Page 666 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A23494
Pump Module (fig. 1):
Condition: Purge FlowCondition: Leak Check
From Refueling Valve
To Air Filter
(Atmosphere)
Vacuum Pump: OFFVent Valve: OFF
(vent)
Pressure Sensor 0.02 Inch Orifice
Caniste

Page 667 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A23565
L5
Pump Module
Pressure Sensor
Vacuum Pump
Vent Valve
Engine Room R/B
BatteryJ/C
V4
Purge
VSVVC
PPMP
E2
MPMP
VPMP
PRG
MREL
EFI Relay
F10
FL Block
54
BBEFI No.1
2D1
53EFI No.2
2A 2 4
1
8
9 3
2

Page 668 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual 0.02 inch orifice clogged
Pressure sensor voltage lowP043E
P043FP0441 P0451 P0452 P0453 P0455 P0456 P2419P2401
P2402
0.02 inch orifice high±flow
Pressure sensor stuck
Pressure sensor noising
Gross le

Page 669 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±467
661 Author: Date:
2005 SEQUOIA (RM1146U)
2 Perform EVAP system check.
NOTICE:
In the EVAP SYSTEM CHECK (AUTO OPERATION), the series of 5 EVAP SYSTEM CHECK steps
is pe

Page 670 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A23497
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Leak PressureON: Open
NegativeONON
Steps
(Reference)60 Within 15 minutes 10 60ON
First 0.02 inch
2/5 3/5 4/55/5
OFF: Closed
OFF: Vent ON:

Page 671 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A23499
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
ON: Open
NegativeONON
Steps
(Reference)
ON
OFF: Closed
OFF: Vent ON: Closed
10
sec
1/5
Time
Pressure Sensor Noising
OK
Leak Pressure Firs

Page 672 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A23500
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
ON: Open
NegativeONON
Steps
(Reference)
ON
OFF: Closed
OFF: Vent ON: Closed
10
sec
1/5
Time
Vacuum Pump Stuck ON
60
sec
2/5
Leak Pressure

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