2001 TOYOTA SEQUOIA tire pressure

IN01T±18
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN±23
23 Author: Date:
HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
GENERAL INFORMATION
A large number of ECU controlled systems are used in the SEQUOIA. In general, the ECU controlled system
is considered to be a very intricate system requiring a high level of technical knowledge and expert skill to
troubleshoot. However, the fact is that if you proceed to inspect the circuits one by one, troubleshooting of
these systems is not complex. If you have adequate understanding of the system and a basic knowledge
of electricity, accurate diagnosis and necessary repair can be performed to locate and fix the problem. This
manual is designed through emphasis of the above standpoint to help service technicians perform accurate
and effective troubleshooting, and is compiled for the following major ECU controlled systems:
The troubleshooting procedure and how to make use of it are described on the following pages.
SystemPage
1. EngineDI±1
2. Automatic TransmissionDI±515
3. Air Suspension Control SystemDI±695
4. Tire Pressure Warning SystemDI±796
5. ABS with EBD & BA & TRAC & VSC SystemDI±891
6. Can Communication SystemDI±1060
7. Supplemental Restraint SystemDI±1118
8. Power Seat Control System w/ Driving Position MemoryDI±1501
9. Cruise Control SystemDI±1536
10.Engine Immobilizer SystemDI±1570
11. Combination Meter SystemDI±1601
12.Sliding Roof SystemDI±1661
13.Body Control SystemDI±1678
14.Driver Door Control SystemDI±1778
15.Passenger Door Control SystemDI±1814
16.Back Door Control SystemDI±1850
17.Multiplex Communication SystemDI±1887
18.Audio SystemDI±1955
19.Rear Seat Audio SystemDI±2044
20.Rear Seat Entertainment SystemDI±2078
21.Navigation SystemDI±2159
22.Air Conditioning SystemDI±2297
FOR USING OBD II SCAN TOOL OR TOYOTA HAND±HELD TESTER

Before using the scan tool or tester, the scan tool's instruction book or tester's operator manual should
be read thoroughly.

If the scan tool or tester cannot communicate with ECU controlled systems when you have connected
the cable of the scan tool or tester to DLC3, turned the ignition switch ON and operated the scan tool,
there is a problem on the vehicle side or tool side.
(1) If communication is normal when the tool is connected to another vehicle, inspect the diagnosis
data link line (Bus
line) or ECU power circuit of the vehicle.
(2) If communication is still not possible when the tool is connected to another vehicle, the problem
is probably in the tool itself, so perform the Self Test procedures outline in the Tester Operator's
Manual.

IN±26± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
26 Author: Date:
2005 SEQUOIA (RM1146U)
2. SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE CHECK
The diagnostic system in the SEQUOIA fulfills various functions. The first function is the Diagnostic Trouble
Code Check in which a malfunction in the signal circuits to the ECU is stored in code in the ECU memory
at the time of occurrence, to be output by the technician during troubleshooting. Another function is the Input
Signal Check which checks if the signals from various switches are sent to the ECU correctly.
By using these check functions, the problem areas can be narrowed down quickly and troubleshooting can
be performed effectively. Diagnostic functions are incorporated in the following systems in the SEQUOIA.
SystemDiagnostic Trouble
Code CheckInput Signal Check
(Sensor Check)Diagnostic Test
Mode (Active Test)
1. Engine(with Check
Mode)
2. Automatic Transmission(with Check
Mode)
3. Air Suspension Control System(with Check
Mode)
4. Tire Pressure Warning System
5. ABS with EBD & BA & TRAC & VSC System
6. Can Communication System
7. Supplemental Restraint System(with Check
Mode)
8. Power Seat Control System w/ Driving Position Memory
9. Cruise Control System
10.Engine Immobilizer System
11. Combination Meter System
12.Sliding Roof System
13.Body Control System
14.Driver Door Control System
15.Passenger Door Control System
16.Back Door Control System
17.Multiplex Communication System
18.Audio System
19.Rear Seat Audio System
20.Rear Seat Entertainment System
21.Air Conditioning System
In diagnostic trouble code check, it is very important to determine whether the problem indicated by the diag-
nostic trouble code is still occurring or occurred in the past but returned to normal at present. In addition,
it must be checked in the problem symptom check whether the malfunction indicated by the diagnostic
trouble code is directly related to the problem symptom or not. For this reason, the diagnostic trouble codes
should be checked before and after the symptom confirmation to determine the current conditions, as shown
in the table on the next page. If this is not done, it may, depending on the case, result in unnecessary trouble-
shooting for normally operating systems, thus making it more difficult to locate the problem, or in repairs not
pertinent to the problem. Therefore, always follow the procedure in correct order and perform the diagnostic
trouble code check.

MA001±42
± MAINTENANCEOUTSIDE VEHICLE
MA±1
48 Author: Date:
2005 SEQUOIA (RM1146U)
OUTSIDE VEHICLE
GENERAL MAINTENANCE
The owners are responsible for these maintenance and inspection items.
They can be done by the owner or they can have them done at a service shop.
These items include those which should be checked on a daily basis, those which, in most cases, do not
require (special) tools and those which are considered to be reasonable for the owner to do.
Items and procedures for general maintenance are as follows.
1. GENERAL NOTES

Maintenance items may vary from country to country. Check the owner's manual supplement in which
the maintenance schedule is shown.

Every service item in the periodic maintenance schedule must be performed.

Periodic maintenance service must be performed according to whichever interval in the periodic main-
tenance schedule occurs first, the odometer reading (miles) or the time interval (months).

Maintenance service after the last period should be performed at the same interval as before unless
otherwise noted.

Failure to do even one item can cause the engine to run poorly and increase exhaust emissions.
2. TIRES
(a) Check the pressure with a gauge.
If necessary, adjust.
(b) Check for cuts, damage or excessive wear.
3. WHEEL NUTS
When checking the tires, check the nuts for looseness or for missing.
If necessary, tighten them.
4. TIRE ROTATION (See page SA±3)
Check the owner's manual supplement in which the maintenance schedule is shown.
5. WINDSHIELD WIPER BLADES
Check for wear or cracks whenever they do not wipe clean.
If necessary, replace.
6. FLUID LEAKS
(a) Check underneath for leaking fuel, oil, water or other fluid.
(b) If you smell gasoline fumes or notice any leak, find the cause and correct.
7. DOORS AND ENGINE HOOD
(a) Check that all doors and the tailgate operate smoothly, and that all latches lock securely.
(b) Check that the engine hood secondary latch secures the hood from opening when the primary latch
is released.

± PREPARATIONSUSPENSION AND AXLE
PP±49
107 Author: Date:
2005 SEQUOIA (RM1146U)
(09710±03051)Bushing ReplacerFront axle
Front suspension
09730±00010Tube RemoverElectronic modulated air suspension
Height control valve
09843±18040Diagnosis Check Wire No.2Tire pressure monitor valve
09922±10010Variable Open WrenchFront suspension
09950±00020Bearing RemoverFront drive shaft
Front differential
Front suspension
Rear differential
09950±30012Puller A Set
(09951±03010)Upper PlateFront differential
Rear differential
(09953±03010)Center BoltFront differential
Rear differential
(09954±03010)ArmFront differential
Rear differential
(09955±03030)Lower Plate 130Front differential
Rear differential
(09956±03020)Adapter 18Front differential
(09956±03050)Adapter 24Rear differential
09950±40011Puller B Set

SS0OJ±22
± SERVICE SPECIFICATIONSSUSPENSION AND AXLE
SS±31
173 Author: Date:
2005 SEQUOIA (RM1146U)
SUSPENSION AND AXLE
SERVICE DATA
Tire size: P245/70R16 Front
Rear220 kPa (2.2 kgf/cm2, 32 psi)
240 kPa (2.4 kgf/cm2, 35 psi)
Cold tire inflation
pressureTire size: P265/70R16 Front
Rear220 kPa (2.2 kgf/cm2, 32 psi)
220 kPa (2.2 kgf/cm2, 32 psi)ressure
Tire size: P265/65R17 Front
Rear220 kPa (2.2 kgf/cm2, 32 psi)
220 kPa (2.2 kgf/cm2, 32 psi)
Vehicle height (Except air suspension models)
UCK35L±GKBSKA
Tire size: P245/70R16 Front:
A*1 ± B*2
Rear: C*3 ± D*4
Tire size: P265/70R16 and P265/65R17
Front:
A*1 ± B*2
Rear: C*3 ± D*4
69.7 mm (2.74 in.)
76.2 mm (3.00 in.)
69.5 mm (2.74 in.)
75.5 mm (2.97 in.)
UCK35L±GKBLKA Front:
A*1 ± B*2
Rear: C*3 ± D*471.6 mm (2.82 in.)
77.3 mm (3.04 in.)
UCK45L±GKBSKA Front:
A*1 ± B*2
Rear: C*3 ± D*461.6 mm (2.43 in.)
63.8 mm (2.51 in.)
Front wheel
UCK45L±GKBLKA Front:
A*1 ± B*2
Rear: C*3 ± D*462.8 mm (2.47 in.)
65.2 mm (2.57 in.)
Front wheel
Alignment
Vehicle height (Except air suspension models)g
UCK35L±GKBSKA
Tire size: P245/70R16 Front:
A*1 ± B*2
Rear: C*3 ± D*4
Tire size: P265/70R16 and P265/65R17
Front:
A*1 ± B*2
Rear: C*3 ± D*4
53.5 ± 83.5 mm (2.11 ± 3.29 in.)
74.8 ± 104.8 mm (2.94 ± 4.13 in.)
53.3 ± 83.3 mm (2.10 ± 3.28 in.)
74.1 ± 104.1 mm (2.92 ± 4.10 in.)
UCK35L±GKBLKA Front:
A*1 ± B*2
Rear: C*3 ± D*455.3 ± 85.3 mm (2.18 ± 3.36 in.)
74.6 ± 104.6 mm (2.94 ± 4.12 in.)
UCK45L±GKBSKA Front:
A*1 ± B*2
Rear: C*3 ± D*445.5 ± 75.5 mm (1.79 ± 2.97 in.)
61.0 ± 91.0 mm (2.40 ± 3.58 in.)
UCK45L±GKBLKA Front:
A*1 ± B*2
Rear: C*3 ± D*446.8 ± 76.8 mm (1.84 ± 3.02 in.)
61.3 ± 91.3 mm (2.41 ± 3.59 in.)
A*1: Ground clearance of the front drive shaft center
B*
2: Ground clearance of the front adjusting cam bolt center
C*
3: Ground clearance of the rear axle shaft center
D*
4: Ground clearance of the rear lower control arm front bolt center

SS1KF±04
± SERVICE SPECIFICATIONSSUSPENSION AND AXLE
SS±39
181 Author: Date:
2005 SEQUOIA (RM1146U)
TORQUE SPECIFICATION
Part tightenedN´mkgf´cmft´lbf
TIRE PRESSURE MONITOR RECEIVER
Tire pressure monitor receiver set bolt7.57666 in.´lbf
TIRE PRESSURE MONITOR VALVE
Tire pressure monitor valve set nut4.04135 in.´lbf
FRONT AXLE
Hub nut11 01,15083
Tie rod end lock nut5556041
Steering knuckle x Brake caliper8082059
Steering knuckle x Dust cover1231,25090
Drive shaft lock nut1818513
Upper suspension arm x Upper ball joint2352,400173
Brake line clamp x Steering knuckle1051,10077
ABS speed sensor x Steering knuckle2828521
ABS speed sensor wire harness clamp x Steering knuckle8.08271 in.´lbf
ABS speed sensor wire harness clamp x Upper suspension arm8.08271 in.´lbf
FRONT DIFFERENTIAL
Drive pinion x companion flangeSee page SA±43
Differential front mounting cushion x Chassis frame1371,400101
Differential rear mounting cushion x Chassis frame8789064
Differential front mounting cushion x Differential1571,60011 6
Differential rear mounting cushion x Differential1081,10080
Ring gear x Differential case9798571
Differential carrier x Differential tube7880058
Differential carrier x Side bearing retainer6970051
Differential x Front propeller shaft7475054
A.D.D. clutch case x Differential7880058
A.D.D. clutch case x Differential tube7880058
A.D.D. actuator x A.D.D. clutch case2121015
Tube with wire harness assembly clamp x Differential carrier131309
Drain plug6566048
Filler plug3940029
FRONT SUSPENSION
Suspension support x Chassis frame6465047
Piston rod x Suspension support2525018
Lower suspension arm x Shock absorber1351,400100
Upper suspension arm x Chassis frame981,00072
Lower suspension arm x Chassis frame1301,32596
Lower suspension arm x Lower ball joint1591,62111 7
Power steering gear Left side nut
Center bolt
Right side bolt and nut130
165
1651,350
1,700
1,70096
122
122
Tie rod end x Lower ball joint9193067
No. 1, No. 2 spring bumper31 (23)315 (235)23 (17)
Lower suspension arm x Stabilizer bar link6970051

DIDJT±01
F19148
Combination Meter
Tire Pressure
Warning Lamp DI±796
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
990 Author: Date:
2005 SEQUOIA (RM1146U)
TIRE PRESSURE WARNING SYSTEM
PRECAUTION
NOTICE:
When disconnecting the battery terminal, initialize the following system after the terminal is recon-
nected.
System NameSee Page
Back Door Power Window Control SystemBE±77
1. TIRE PRESSURE WARNING SYSTEM PRECAUTION
(a) When the tire pressure warning lamp comes on, immedi-
ately check the tire pressure of the tire and adjust it to the
specified pressure. (The tire pressure warning lamp
comes on if there is an open in the tire pressure warning
lamp circuit.)
NOTICE:
Check the spare tire as well since this system monitors
pressure of all tires, including the spare.
Tire sizeFrontRearSpare
P245 / 70 R 16220 kPa (2.2 kgf/cm2, 32 psi)240 kPa (2.4 kgf/cm2, 35 psi)240 kPa (2.4 kgf/cm2, 35 psi)
P265 / 70 R 16220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)
P265 / 65 R 17220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)
(b) When the tire pressure warning lamp blinks, there is a
malfunction in the system. Check for DTCs.
(c) It is necessary to register the transmitter ID in the tire pres-
sure monitor ECU when replacing the tire pressure moni-
tor valve sub±assy and/or tire pressure monitor ECU (see
page DI±805).
(d) When replacing the tire pressure monitor ECU.
(1) Using the DATA LIST, read the transmitter IDs regis-
tered in the ECU and make a note of them before
removing the tire pressure monitor ECU.
(2) Register the transmitter IDs after installing a new
tire pressure monitor ECU.
(e) When replacing the tire pressure monitor valve sub±assy.
(1) Make a note of the 7 digit number (transmitter ID)
written on the tire pressure monitor valve sub±assy
when replacing the tire pressure monitor valve sub±
assy. Register the transmitter IDs in the tire pres-
sure monitor ECU after replacing the tire pressure
monitor valve sub±assy and installing the tires and
wheels on the vehicle.

F19132
Transmitter ID
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±797
991 Author: Date:
2005 SEQUOIA (RM1146U)
NOTICE:
The transmitter ID is written on the tire pressure monitor
valve sub±assy and ID can not be seen after installing the
tire pressure monitor valve sub±assy on the tire and wheel.
Therefore, make a note of the transmitter ID before instal-
ling the tire pressure monitor valve sub±assy.
2. IN CASE OF TIRE AND WHEEL REPLACEMENT
(a) When tires and wheels are replaced, register the transmitter ID without fail.
3. IN CASE OF TIRE ROTATION OR REPLACEMENT OF TIRE PRESSURE MONITOR ECU, TIRE
PRESSURE MONITOR VALVE SUB±ASSY, OR TIRES WITH DIFFERENT TIRE PRESSURE
(a) Initialize the tire pressure warning system after one of the following is performed:

Replacing the tire pressure monitor ECU or the tire pressure monitor valve sub±assy

Tire rotation

Replacing tires with different tire pressure
HINT:
The tire pressure warning system will not operate properly if it is not initialized (see page DI±808).
4. FAIL±SAFE FUNCTION
(a) When a system malfunction occurs in the tire pressure warning system, the tire pressure warning lamp
blinks and informs the driver of the system failure.
(b) The result of this diagnosis is stored in the tire pressure monitor ECU.