2001 TOYOTA SEQUOIA catalytic

EC08C±05
B17492
N´m (kgf´cm, ft´lbf): Specified torque

Non±reusable partRH Front Exhaust Pipe
RH TWC GasketHeated Oxygen Sensor
Ring
LH Front
Exhaust Pipe

62 (632, 46)
Gasket



Gasket

Heated Oxygen
Sensor
Gasket

LH TWC
62 (632, 46)

48 (489, 35)
44 (450, 32)
44 (450, 32)
± EMISSION CONTROLTHREE±WAY CATALYTIC CONVERTER (TWC)
SYSTEMEC±15
2723 Author: Date:
2005 SEQUOIA (RM1146U)
COMPONENTS

EC0NQ±01
A23379
A23380
A23381
EC±16± EMISSION CONTROLTHREE±WAY CATALYTIC CONVERTER (TWC)
SYSTEM
2724 Author: Date:
2005 SEQUOIA (RM1146U)
REPLACEMENT
1. DISCONNECT HEATED OXYGEN SENSORS
Remove the 2 heated oxygen sensors from the front exhaust
pipes.
2. REMOVE RH AND LH FRONT EXHAUST PIPES
(a) Remove the 6 nuts from the front side of the RH and LH
front exhaust pipes.
(b) Remove the 4 bolts from the rear side of the RH and LH
front exhaust pipes.
(c) Remove the RH and LH front exhaust pipes and 4 gas-
kets.
3. INSTALL RH AND LH FRONT EXHAUST PIPES
(a) Install 4 new gaskets to the RH and LH front exhaust
pipes.
(b) Install the 4 bolts.
Torque: 48 N´m (489 kgf´cm, 35 ft´lbf)
(c) Install 6 new nuts to the front side of the RH and LH front
exhaust pipes.
Torque: 62 N´m (632 kgf´cm, 46 ft´lbf)
4. INSTALL HEATED OXYGEN SENSOR
Install the 2 heated oxygen sensors to the RH and LH front ex-
haust pipes.
Torque: 44 N´m (450 kgf´cm, 32 ft´lbf)

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2005 SEQUOIA from Aug. '04 Prod. (OM34424U)
INFORMATION BEFORE DRIVING YOUR
TOYOTA
Information before driving your Toyota
Off±road vehicle precautions334 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Break±in period335 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel335 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel pump shut off system337 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation in foreign countries337 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Three±way catalytic converters338 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine exhaust cautions339 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Facts about engine oil consumption339 . . . . . . . . . . . . . . . . . . . . . . . . . .
Iridium±tipped spark plugs341 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake system341 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake pad wear limit indicators345 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Your Toyota's identification345 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theft prevention labels346 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suspension and chassis346 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tire information347 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vehicle load limits355 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cargo and luggage356 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Types of tires358 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 2

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2005 SEQUOIA from Aug. '04 Prod. (OM34424U)

Always slow down in gusty cross-
winds. Because of its profile and
higher center of gravity, your ve-
hicle is more sensitive to side
winds than an ordinary passenger
car. Slowing down will allow you to
have better control.

When driving off±road or in rugged
terrain, do not drive at excessive
speeds, jump, make sharp turns,
strike objects, etc. This may cause
loss of control or vehicle rollover
causing death or serious injury. You
are also risking expensive damage
to your vehicle's suspension and
chassis.

Do not drive horizontally across
steep slopes. Driving straight up or
straight down is preferred. Your ve-
hicle (or any similar off±road ve-
hicle) can tip over sideways much
more easily than forward or back-
ward.
Drive gently and avoid high speeds.
Your vehicle does not need an elaborate
break±in. But following a few simple tips
for the first 1600 km (1000 miles) can add
to the future economy and long life of
your vehicle:

Avoid full throttle acceleration when
starting and driving.

Avoid racing the engine.

Try to avoid hard stops during the first
300 km (200 miles).

Do not drive for a long time at any
single speed, either fast or slow.

Do not tow a trailer during the first
3200km (2000 miles).FUEL TYPE
Your new vehicle must use only un-
leaded gasoline.
To help prevent gas station mix±ups, your
Toyota has a smaller fuel tank opening.
The special nozzle on pumps with un-
leaded fuel will fit it, but the larger stan-
dard nozzle on pumps with leaded gas will
not.
At a minimum, the gasoline you use
should meet the specifications of ASTM
D4814 in the U.S.A. and CGSB 3.5±M93
in Canada.NOTICE
Do not use leaded gasoline. Use of
leaded gasoline will cause the three±
way catalytic converter to lose its ef-
fectiveness and the emission control
system to function improperly. Also,
this can increase maintenance costs.
Break±in period Fuel

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2005 SEQUOIA from Aug. '04 Prod. (OM34424U)
The three±way catalytic converter is an
emission control device installed in the
exhaust system.
The purpose is to reduce pollutants in the
exhaust gas.
CAUTION

Keep people and combustible mate-
rials away from the exhaust pipe
while the engine is running. The
exhaust gas is very hot.

Do not idle or park your vehicle
over anything that might burn easi-
ly such as grass, leaves, paper or
rags.
NOTICE
A large amount of unburned gases
flowing into the three±way catalytic
converter may cause it to overheat
and create a fire hazard. To prevent
this and other damage, observe the
following precautions:

Use only unleaded gasoline.

Do not drive with an extremely low
fuel level; running out of fuel could
cause the engine to misfire, creat-
ing an excessive load on the three±
way catalytic converter.

Do not allow the engine to run at
idle speed for more than 20 min-
utes.

Avoid racing the engine.

Do not push±start or pull±start your
vehicle.

Do not turn off the ignition while
the vehicle is moving.

Keep your engine in good running
order. Malfunctions in the engine
electrical system, electronic ignition
system/distributor ignition system
or fuel systems could cause an ex-
tremely high three±way catalytic
converter temperature.

If the engine becomes difficult to
start or stalls frequently, take your
vehicle in for a check±up as soon
as possible. Remember, your Toyota
dealer knows your vehicle and its
three±way catalytic converter sys-
tem best.

To ensure that the three±way cata-
lytic converter and the entire emis-
sion control system operate proper-
ly, your vehicle must receive the
periodic inspections required by the
Toyota Maintenance Schedule. For
scheduled maintenance information,
refer to the ªScheduled Maintenance
Guideº or ªOwner 's Manual Supple-
mentº.
Three±way catalytic converters

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Before making these checks, make sure
you have followed the correct starting pro-
cedure given in ªHow to start the engineº
on page 362 in Section 3 and that you
have sufficient fuel. Also, check whether
the other keys will start the engine. If
they work, your key may be broken. Have
the key checked at your Toyota dealer. If
none of your keys work, there may be a
malfunction in the immobilizer system. Call
your Toyota dealer. (See ªKeysº on page
14 in Section 1±2.)
If the engine is not turning over or is
turning over too slowlyÐ
1. Check that the battery terminals are
tight and clean.
2. If the battery terminals are O.K., switch
on the interior light.
3. If the light is out, dim or goes out
when the starter is cranked, the battery
is discharged. You may try jump start-
ing. See ª(c) Jump startingº for further
instructions.
If the light is O.K., but the engine still will
not start, it needs adjustment or repair.
Call a Toyota dealer or qualified repair
shop.NOTICE
Do not pull± or push±start the ve-
hicle. It may damage the vehicle or
cause a collision when the engine
starts. Also the three±way catalytic
converter may overheat and become a
fire hazard.
If the engine turns over at its normal
speed but will not startÐ
1. Turn the ignition key to ªACCº or
ªLOCKº and try starting the engine
again.
2. If the engine will not start, the engine
may be flooded because of repeated
cranking. See ª(b) Starting a flooded
engineº for further instructions.
3. If the engine still will not start, it needs
adjustment or repair. Call a Toyota
dealer or qualified repair shop.If the engine will not start, your engine
may be flooded because of repeated
cranking.
If this happens, turn the ignition key to
ªSTARTº with the accelerator pedal fully
depressed, and hold the key at this posi-
tion for about 30 seconds. Then the
cranking hold function stops cranking au-
tomatically, and you can try starting the
engine with your foot off the accelerator
pedal.
If the engine does not start, wait a few
minutes and try again.
If the engine still will not start, it needs
adjustment or repair. Call a Toyota dealer
or qualified repair shop for assistance.
If your vehicle will not startÐ
(a) Simple checks(b) Starting a flooded engine