suspension TOYOTA SEQUOIA 2001 Service Repair Manual

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.

IN04Q±33
IN±40
± INTRODUCTIONTERMS
40 Author: Date:
2005 SEQUOIA (RM1146U)
TERMS
ABBREVIATIONS USED IN THIS MANUAL
AbbreviationsMeaning
ABSAnti±Lock Brake System
A/CAir Conditioner
ACAlternating Current
ACCAccessory
ACISAcoustic Control Induction System
ACMActive Control Engine Mount
ACSDAutomatic Cold Start Device
A.D.D.Automatic Disconnecting Differential
A/FAir±Fuel Ratio
AHCActive Height Control Suspension
ALRAutomatic Locking Retractor
ALTAlternator
AMPAmplifier
ANTAntenna
APPROX.Approximately
ASSYAssembly
A/T, ATMAutomatic Transmission (Transaxle)
AT FAutomatic Transmission Fluid
AUTOAutomatic
AUXAuxiliary
AV GAverage
AV SAdaptive Variable Suspension
B+Battery Voltage
BABrake Assist
BACSBoost Altitude Compensation System
BATBattery
BDCBottom Dead Center
B/LBi±Level
B/SBore±Stroke Ratio
BTDCBefore Top Dead Center
BVSVBimetallic Vacuum Switching Valve
CBCircuit Breaker
CCoCatalytic Converter For Oxidation
CCVCanister Closed Valve
CDCompact Disc
CFCornering Force
CGCenter Of Gravity
CHChannel
CKDComplete Knock Down
COMB.Combination
CPECoupe
CPSCombustion Pressure Sensor
CPUCentral Processing Unit
CRSChild Restraint System
CTRCenter
C/VCheck Valve
CVControl Valve
CWCurb Weight

IN±42
± INTRODUCTIONTERMS
42 Author: Date:
2005 SEQUOIA (RM1146U) H/B
Hatchback
H±FUSEHigh Current Fuse
HIHigh
HIDHigh Intensity Discharge (Head Lamp)
HSGHousing
HTHard Top
HWSHeated Windshield System
ICIntegrated Circuit
IDIIndirect Diesel Injection
IFSIndependent Front Suspension
IGIgnition
IIAIntegrated Ignition Assembly
INIntake (Manifold, Valve)
INTIntermittent
I/PInstrument Panel
IRSIndependent Rear Suspension
ISCIdle Speed Control
J/BJunction Block
J/CJunction Connector
KDKick±Down
LANLocal Area Network
LBLiftback
LCDLiquid Crystal Display
LEDLight Emitting Diode
LHLeft±Hand
LHDLeft±Hand Drive
L/H/WLength, Height, Width
LLCLong±Life Coolant
LNGLiquified Natural Gas
LOLow
LPGLiquified Petroleum Gas
LSDLimited Slip Differential
LSP & PVLoad Sensing Proportioning And Bypass Valve
LSPVLoad Sensing Proportioning Valve
MAPManifold Absolute Pressure
MAX.Maximum
MICMicrophone
MILMalfunction Indicator Lamp
MIN.Minimum
MG1Motor Generator No.1
MG2Motor Generator No.2
MPMultipurpose
MPIMultipoint Electronic Injection
MPXMultiplex Communication System
M/T, MTMManual Transmission (Transaxle)
MTMount
MTGMounting
NNeutral
NANatural Aspiration
NO.Number
O2SOxygen Sensor
O/DOverdrive

± INTRODUCTIONTERMS
IN±43
43 Author: Date:
2005 SEQUOIA (RM1146U) OEM
Original Equipment Manufacturing
OHCOverhead Camshaft
OHVOverhead Valve
OPTOption
ORVROn±board Refilling Vapor Recovery
O/SOversize
P & BVProportioning And Bypass Valve
PCSPower Control System
PCVPositive Crankcase Ventilation
PKBParking Brake
PPSProgressive Power Steering
PSPower Steering
PTOPower Take±Off
P/WPower Window
R & PRack And Pinion
RAMRandom Access Memory
R/BRelay Block
RBSRecirculating Ball Type Steering
R/FReinforcement
RFSRigid Front Suspension
RHRight±Hand
RHDRight±Hand Drive
RLYRelay
ROMRead Only Memory
RRRear
RRSRigid Front Suspension
RWDRear±Wheel Drive
SDNSedan
SENSensor
SICSStarting Injection Control System
SOCState Of Charge
SOHCSingle Overhead Camshaft
SPECSpecification
SPISingle Point Injection
SRSSupplemental Restraint System
SSMSpecial Service Materials
SSTSpecial Service Tools
STDStandard
STJCold±Start Fuel Injection
SWSwitch
SYSSystem
T/ATransaxle
TACHTachometer
TBIThrottle Body Electronic Fuel Injection
TCTurbocharger
TCCSTOYOTA Computer±Controlled System
TCVTiming Control Valve
TDCTop Dead Center
TEMP.Temperature
TEMSTOYOTA Electronic Modulated Suspension
TFTTOYOTA Free±Tronic
TISTotal Information System For Vehicle Development

B02100
± MAINTENANCECHASSIS
MA±11
58 Author: Date:
2005 SEQUOIA (RM1146U)

Leaf spring U±bolt mounting nuts
Torque: 133 N´m (1,350 kgf´cm, 98 ft´lbf )
(b) Under Severe Conditions:
In addition to the above maintenance items, check for
loose or missing bolts and nuts on the following.

Steering system

Drive train

Suspension system

Fuel tank mounts

Engine mounts, etc.
14. FINAL INSPECTION
(a) Check operation of body parts:

Hood:

Auxiliary catch operates properly

Hood locks securely when closed

Doors:

Door locks operate properly

Doors close properly

Seats:

Seat adjusts easily and locks securely in any
positions

Seat backs lock securely at any angle

Fold±down seat backs lock securely
(b) Road test:

Engine and chassis parts do not have abnormal
noises.

Vehicle does not wander or pull to one side.

Brakes work properly and do not drag.
(c) Be sure to deliver a clean vehicle and especially check:

Steering wheel

Shift lever knob

All switch knobs

Door handles

Seats

PP1BL±10
PP±6
± PREPARATIONENGINE MECHANICAL
64 Author: Date:
2005 SEQUOIA (RM1146U)
RECOMMENDED TOOLS
09040±00011Hexagon Wrench Set .
09090±04020Engine Sling DeviceFor suspension engine
09200±00010Engine Adjust Kit .
09258±00030Hose Plug Set .Plug for vacuum hose, fuel hose etc.
09904±00010Expander Set .

PP434±01
± PREPARATIONSUSPENSION AND AXLE
PP±45
103 Author: Date:
2005 SEQUOIA (RM1146U)
SUSPENSION AND AXLE
SST (Special Service Tools)
09023±00101Union Nut Wrench 10mmRear axle
09213±58013Crankshaft Pully Holding ToolRear differential
09223±15020Oil Seal & Bearing ReplacerFront differential
09223±15030Oil Seal & Bearing ReplacerFront axle
09226±10010Crankshaft Front & Rear Bearing
ReplacerFront differential
09240±00020Wire Gauge SetFront drive shaft
09308±00010Oil Seal PullerFront differential
Rear axle
09308±10010Oil Seal PullerFront differential
Rear differential
09309±37010Transmission Bearing ReplacerFront differential
Front suspension
09316±12010Transfer Bearing ReplacerRear differential
09318±12010Transfer Bearing Adjusting Nut
WrenchFront axle (2WD)
09330±00021Companion Flange Holding ToolFront differential
Rear differential

PP±46
± PREPARATIONSUSPENSION AND AXLE
104 Author: Date:
2005 SEQUOIA (RM1146U)
09350±20015TOYOTA Automatic Transmission
Tool SetFront differential
(09369±20040)Piston Spring Compressor Set
09502±12010Differential Bearing ReplacerFront differential
Front suspension
09504±22012Differential Side Bearing
ReplacerRear differential
09506±30012Differential Drive Pinion Rear
Bearing Cone ReplacerFront differential
09506±35010Differential Drive Pinion Rear
Bearing ReplacerRear differential
09520±01010Drive Shaft Remover AttachmentFront drive shaft
09520±24010Differential Side Gear Shaft
PullerFront drive shaft
(09520±32040)Shocker Set
09521±24010Drive Shaft Boot Clamping ToolFront drive shaft
09521±25011Rear Axle Shaft PullerRear axle
09521±25021Rear Axle Shaft Puller
AttachmentRear axle
09523±36010Rear Axle Hub Guide ToolRear differential

± PREPARATIONSUSPENSION AND AXLE
PP±47
105 Author: Date:
2005 SEQUOIA (RM1146U)
09527±17011Rear Axle Shaft Bearing RemoverFront axle
09554±22010Differential Oil Seal ReplacerFront differential
09556±22010Drive Pinion Front Bearing
RemoverFront differential
Rear differential
09564±32011Differential Preload AdaptorFront differential
09570±22011Differential Mounting Cushion
Remover & ReplacerFront differential
09608±32010Steering Knuckle Oil Seal
ReplacerFront differential
09610±20012Pitman Arm PullerFront suspension
09612±65014Steering Worm Bearing PullerFront differential
(09612±01020)Claw ºBº
(09612±01050)Hanger Pin with Nut
09613±26010Steering Worm Bearing Cone
RemoverFront suspension
09631±20060Bearing Guide Nut Wrench
09628±62011Ball Joint PullerFront drive shaft
Front suspension