2001 TOYOTA SEQUOIA tire type

DIDJW±01
F19887
Tire Pressure Monitor Valve Sub±assy
Tire Pressure
Warning Reset
Switch
Tire Pressure
Monitor ECU
Meter
DLC3
Tire Pressure Monitor Valve Sub±assyTire Pressure Monitor Receiver Assy
DI±800
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
994 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. DESCRIPTION OF SYSTEM
(a) A tire pressure monitor valve sub±assy equipped with a tire pressure sensor and a transmitter and is
installed in a tire wheel assy. The sensor measures the tire pressure and the measured value and
transmitter ID are transmitted to the tire pressure monitor receiver assy on the body as radio waves
and then sent to the tire pressure monitor ECU from the tire pressure monitor receiver. If the transmitter
ID has already been registered, the ECU compares the measured air pressure value with the standard
value. When the value is less than the standard value registered in the tire pressure monitor ECU, the
warning lamp on the combination meter comes on.

To address the differences in the air pressure settings by the type of tires, or the differences in
pressure between the front and rear tires, a tire pressure warning reset switch has been newly
adopted.

Along with the adoption of the tire pressure warning reset switch, the warning operation has been
changed.

TPWS transmitters with different bending angles as the tire pressure monitor valve sub±assy
have been provided for steel wheels with center ornaments. (They are not interchangeable with
aluminum wheels or steel wheels with full wheel caps.)
2. WHEN TIRE PRESSURE WARNING LAMP IS LIT
(a) When the warning lamp does not go off, or when it comes on during driving, check tire pressure. If the
warning lamp is lit even though the tire pressure is correctly adjusted, the tire could be punctured.
(b) Under the following conditions, the system may not function properly.

The areas, facilities or devices that use similar radio frequencies are located in the vicinity of the
vehicle.

A radio device of similar frequency is used in the vehicle.

A lot of snow or ice is stuck to the vehicle, especially onto the wheels and around the wheel
houses.

The battery of the sensor has been depleted.

The tires without tire pressure monitor valve sub±assy are used.

Tire chains are used.

± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±801
995 Author: Date:
2005 SEQUOIA (RM1146U)

When the spare tire is not within the receivable range of the electric wave, a signal may not be
received because spare tires are fixed. Accordingly, the system may not function properly. If
there is a possibility that the TPWS system does not receive a signal from the spare tire, rotate
the tire 90°.
HINT:

If any other wheels than the specified ones are used, the system may not function properly because
the radio waves are differently transmitted from the tire pressure sensor.

Depending on the tire type, the system may not function properly even though the specified wheels
are used.
(c) The average use life of the grommet of the tire pressure monitor valve sub±assy is approximately 5
years, at which time it must be replaced.
(d) After removing and installing the ECU or a sensor, output a diagnosis code and check that it is a normal
code.
3. FUNCTION OF COMPONENTS
ComponentsFunction
Tire pressure monitor valve sub±assy
Combined as a single unit with a disc wheel air valve, it measures tire pressure and
temperature and transmits an ID number for measurement value and identification.
Built±in the battery.
Tire pressure monitor receiver assyReceives and transmits a necessary signal from the transmitter to the tire pressure
monitor ECU.
Tire pressure monitor ECU
Receives the signal from the receiver and identifies it as vehicle's own signal. If the
measurement value is equal to or lower than the specified value, it transmits a sig-
nal so that the air pressure warning lamp on the combination meter comes on.
Tire pressure warning lampLocated in the combination meter, it informs the driver of lowered tire air pressure
and system failure.
Tire pressure warning reset switchEnters the initialization mode for tire or wheel replacement, or tire rotation
4. TIRE PRESSURE WARNING RESET SWITCH

By operating the tire pressure warning reset switch, the tire pressure monitor ECU can be set to issue
a warning at an inflation pressure that corresponds to the type of tires. Therefore, the dealer must set
the warning threshold to the proper value in order to comply with the local regulations.

Operate the tire pressure warning reset switch only after the inflation pressures of all 5 tires (including
the spare) have been adjusted on the vehicle.

To initialize the system, press and hold the tire pressure warning reset switch for 3 seconds or longer
with the ignition switch ON. After the system has been initialized, the warning lamp blinks 3 times (1
second ON, 1 second OFF).

During initialization, the tire pressure monitor valve sub±assy measures the inflation pressure of the
tires, and registers the signals that are transmitted into the tire pressure monitor ECU at a frequency
of one per minute. The initialization process is completed when the signals from the 5 tires have been
received.

The initialization process is canceled if the ignition switch is turned OFF during initialization. To initialize
again, the tire pressure warning reset switch must be pressed again. For this reason, once the tire pres-
sure warning reset switch has been pressed, turning OFF the ignition switch is not recommended for
a minimum of 20 minutes.

DIDJY±01
Inspector 's
Name:
Customer 's Name
Date Vehicle
Brought InProduction DateVIN
Licence Plate No.
Odometer Reading/ /
/ /
Date of First Occurrence
Frequency of Problem Occurrence/ /
Continuous Intermittent ( times a day)
In spite of abnormal low tire pressure, the warning lamp does not
come on.
The warning lamp was lit and the tire was filled up with air, but
the warning lamp does not go off.
Remains ONDoes not come on
Check ItemTire Pressure
Warning LampNormal
Malfunction Code (Code )
Symptomskm
miles
Tire Pressure Warning System Check Sheet
Tire Pressure
Warning Lamp
Abnormal
TireTire Pressure
FR ( ) FL ( ) RR ( ) RL ( )
Tire Size
Tire Type
Tire Wear Condition
History of changing tires or wheels
When ( )
History of rotating tires FR ( ) FL ( ) RR ( ) RL ( )
FR ( ) FL ( ) RR ( ) RL ( )
FR ( ) FL ( ) RR ( ) RL ( )
When ( )
DI±804
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
998 Author: Date:
2005 SEQUOIA (RM1146U)
CUSTOMER PROBLEM ANALYSIS CHECK

I28203
I28204
I28187
Radio and Display Assy
Navigation ECURadio and Navigation Assy DI±2164
± DIAGNOSTICSNAVIGATION SYSTEM
2358 Author: Date:
2005 SEQUOIA (RM1146U)
(9) When the vehicle runs on the snowy road or a
mountain path with the chains installed or using a
spare tire, the current vehicle position mark may
deviate from the correct position.
(10) When a tire is changed, the current vehicle position
mark may deviate from the correct position.
HINT:
Diameter of the tire may change, causing a speed sensor
error.
Performing the ºtire changeº in calibration mode will allow
the system to correct the current vehicle position faster.
2. Radio and navigation assy outline
Conventionally, 2 separate devices, a ºradio and display assyº and a ºnavigation ECUº are used. This model
has adopted a new type, combining these devices into a single unit.

SA28F±08
START
Preliminary Check
Tire pressure
Vehicle height
Brake dragging ROAD TEST
Does the vehicle lead/pull?
Cross switch front tire & wheel
assemblies (left & right).
Does the vehicle lead/pull in the
same direction as before?
Check front wheel alignment.
Is it within specification?
Adjust front wheel alignment.Reverse the front left side
tire and rebalance it.
Does the vehicle
lead/pull to the left?
COMPLETE
Are the tires uni±directional type?
Choose the position of front tire & wheel
assemblies where there is the least amount of pull.
Increase left front camber and decrease
right front camber until lead/pull is eliminated.Increase right front camber and decrease
left front camber until lead/pull is eliminated.
NO
YES
YES
NO
YES
YES
NO
YES
NO COMPLETE
NONOYES NOIs there steering
off center?
Adjust front tie rods.
NO
YES
Is the lead/pull stronger
than before?
YES
NOTICE : Do not exceed 1° of cross camber.
Do not exceed adjustment range.
Select a flat road where the vehicle can be driven in a straight line for 100 meters at a constant speed
of 35mph. Please confirm safety and set the steering wheel to its straight position. Drive the vehicle in
a straight line for 100 meters at a constant speed of 35mph without holding the steering wheel.
(1) The vehicle can keep straight but the steering wheel has some angle.
STEERING OFF CENTER (See page SR±10)
(2) The vehicle cannot keep straight.
STEERING PULL
YES NO
YES ROAD TEST
Does the vehicle still lead/pull?
NO ROAD TEST
Does the vehicle still lead/pull? ROAD TEST
Does the vehicle still lead/pull?
ROAD TEST
Does the vehicle still lead/pull?NO
Contact your local retail tire distributor.YES
*
*
SA±2
± SUSPENSION AND AXLETROUBLESHOOTING
2998 Author: Date:
2005 SEQUOIA (RM1146U)
REPAIR PROCEDURES
HINT:
This is a flow chart for vehicle pull.

F16839
Do not extend
the rear pneumatic
cylinder
Hole
Seating Pin SA±132
± SUSPENSION AND AXLEREAR PNEUMATIC CYLINDER
3128 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:
Perform the following before installation.
When using safety stands and jack:
(1) Jack up the rear axle until the bottom of the rear
pneumatic cylinder touches the rear axle and fit the
seating pin on the lower side of the rear pneumatic
cylinder into the rear axle.
NOTICE:

Do not extend the rear pneumatic cylinder in order to
fit the seating pin into the hole.

Make sure that the seating pin on the lower side of the
rear pneumatic cylinder fits in the hole in the rear
axle.
(2) Remove the safety stands with care not to extend
the rear pneumatic cylinder when jacking down the
vehicle till it sits on the ground.
NOTICE:
Make sure that the diaphragm (rubber part) of the pneumat-
ic cylinder is not deformed.
(3) Start the engine and replenish the rear pneumatic
cylinder with air.
(e) When using a swing arm type lift:
(1) Lower the vehicle till the tires hit the ground, and
continue lowering slowly until the bottom of the rear
pneumatic cylinder touches the rear axle.
(2) Align the seating pin on the cylinder with the hole in
the rear axle and install the rear pneumatic cylinder
on the rear axle.
NOTICE:

Do not extend the rear pneumatic cylinder by lifting
up the rear axle housing after fitting the seating pin.

Make sure that the diaphragm (rubber part) of the
pneumatic cylinder is not deformed.
(3) Lower the lift carefully so as not to extend the rear
pneumatic cylinder.
NOTICE:
Make sure that the diaphragm (rubber part) of the pneumat-
ic cylinder is not deformed.
(4) Start the engine and replenish the rear pneumatic
cylinder with air.

R07653
SR01Y±11
R09732
± STEERINGSTEERING WHEEL
SR±9
3236 Author: Date:
2005 SEQUOIA (RM1146U)
STEERING WHEEL
INSPECTION
1. CHECK STEERING WHEEL FREE PLAY
(a) Stop the vehicle and face the tires straight ahead.
(b) Gently rock the steering wheel up and down with a finger,
and check the steering wheel free play.
Maximum free play: 30 mm (1.18 in.)
2. CHECK STEERING EFFORT
(a) Center the steering wheel.
(b) Remove the steering wheel pad (See page SR±12).
(c) Start the engine and run at idle.
(d) Measure the steering effort in both directions.
Steering effort (Reference):
4.9 N´m (50 kgf´cm, 43 in.´lbf)
HINT:
Check tire type, pressure and contact surface before making
your diagnosis.
(e) Tighten the steering wheel set nut.
Torque: 50 N´m (510 kgf´cm, 37 ft´lbf)
(f) Install the steering wheel pad (See page SR±23).

H23934
AB0163
Wire Harness
Diameter
Stripped Wire Harness Section
H17493
± SUPPLEMENTAL RESTRAINT SYSTEMSIDE AIRBAG ASSEMBLY (Power Adjuster Type)
RS±53
3336 Author: Date:
2005 SEQUOIA (RM1146U)
(d) Remove the 2 nuts and side airbag assembly from the
seatback assembly.
CAUTION:

When removing the front seat airbag assembly, work
must be started 90 seconds after the ignition switch
is turned to the ºLOCKº position and the negative (±)
terminal cable is disconnected from the battery.

When storing the front passenger airbag assembly,
keep the airbag deployment side facing upward.
(e) Using a service±purpose wire harness for the vehicle, tie
down the front passenger airbag assembly to the tire.
Wire harness: Stripped wire harness section
1.25 mm
2
or more (0.0019 in2. or more)
HINT:
To calculate the area of the stripped wire harness section:
Area = 3.14 x (Diameter)
2 divided by 4
CAUTION:
If the wire harness is too thin or an alternative object is
used to tie down the front passenger airbag assembly, it
may be snapped by the shock when the airbag is deployed.
Always use a wire harness for vehicle use with an area of
at least 1.25 mm
2
(0.0019 in.2).
(1) Install the 2 nuts to the side airbag assembly.