2001 TOYOTA SEQUOIA DIFF.

± INTRODUCTIONTERMS
IN±41
41 Author: Date:
2005 SEQUOIA (RM1146U) DC
Direct Current
DEFDefogger
DFLDeflector
DIFF.Differential
DIFF. LOCKDifferential Lock
D/INJDirect Injection
DLCData Link Connector
DLIDistributorless Ignition
DOHCDouble Overhead Camshaft
DPDash Pot
DSDead Soak
DSPDigital Signal Processor
DTCDiagnostic Trouble Code
DVDDigital Versatible Disc
EBDElectric Brake Force Distribution
ECElectrochoromic
ECAMEngine Control And Measurement System
ECDElectronically Controlled Diesel
ECDYEddy Current Dynamometer
ECTElectronic Control Transmission
ECUElectronic Control Unit
EDElectro±Deposited Coating
EDUElectronic Driving Unit
EDICElectric Diesel Injection Control
EFIElectronic Fuel Injection
E/GEngine
EGRExhaust Gas Recirculation
EGR±VMEGR±Vacuum Modulator
ELREmergency Locking Retractor
EMPSElectric Motor Power Steering
ENGEngine
ESAElectronic Spark Advance
ETCS±iElectronic Throttle Control System±intelligent
EVAPEvaporative Emission Control
EVPEvaporator
E±VRVElectric Vacuum Regulating Valve
EXExhaust
FEFuel Economy
FFFront±Engine Front±Wheel±Drive
F/GFuel Gauge
FIPGFormed In Place Gasket
FLFusible Link
F/PFuel Pump
FPUFuel Pressure Up
FRFront
F/WFlywheel
FW/DFlywheel Damper
FWDFront±Wheel±Drive
GASGasoline
GNDGround
GPSGlobal Positioning System
HACHigh Altitude Compensator

DIDCF±01
F19439
Crankshaft
Position SensorEngine Room R/B No. 3
Engine Room J/B
Instrument
Panel J/B

STOP Fuse

IGN1 Fuse

ECU±IG Fuse
Stop Light
Switch
Combination Meter
Height Control Switch Body ECU
ECM Engine Room R/B No. 2
Suspension Control ECU
Translate ECU
4LO Switch
2WD/4HI Switch
Height Control Mode Select SwitchIgnition Switch
Height Control Indicator
Fusible Link Block

AIR SUS Fuse

AM2 Fuse

Height Control Manual IndicatorCenter Diff. Lock Switch
DLC3
Vehicle Speed Sensor
Vehicle Speed Sensor

AIR SUS Relay

AIR SUS No. 2 Fuse DI±696
± DIAGNOSTICSAIR SUSPENSION SYSTEM
890 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION

DIDLV±01
F17996
Front Speed SensorABS & VSC Actuator
(w/ Skid Control ECU)Level Warning Switch
Rear Speed Sensor Rear Speed Sensor Rotor
Front Speed
Sensor Rotor
Parking Brake SwitchStop Light Switch
Center Diff. Lock Switch *1
TRAC OFF Switch *2
Steering Angle Sensor
DLC3Brake Inhibit RelayTranslate ECU
VSC BuzzerBrake Booster
(Including Active Brake Booster
Solenoid, Delta S Sensor and Boost-
er Pedal Switch)
Master Cylinder
Pressure Sensor
Front Speed Sensor Rotor
Front Speed Sensor
Yaw Rate Sensor
(Including Deceleration Sensor)
ABS Warning Light
VSC TRAC Warning light
VSC OFF Indicator Light *
1
TRAC OFF Indicator Light *2
BRAKE Warning Light
SLIP Indicator Light
*1: Only for 4WD
*2: Only for 2WDCenter Diff. Lock
Position Switch
DI±892
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1086 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION

DIDLY±01
F09750
DLC3
Ts
Tc
CG
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±897
1091 Author: Date:
2005 SEQUOIA (RM1146U)
CALIBRATION
1. ZERO POINT CALIBRATION OF MASTER CYLINDER
PRESSURE, YAW RATE AND DECELERATION SEN-
SORS
HINT:
When having replaced the master cylinder pressure, yaw rate
and deceleration sensors and/or the ECU, make sure to per-
form master cylinder pressure, yaw rate and deceleration sen-
sors' zero point calibration.
NOTICE:

While obtaining the zero point, do not vibrate the ve-
hicle by tilting, moving or shaking it and keep it in a
stationary condition. (Do not start the engine.)

Be sure to do this on a level surface (within an inclina-
tion of 1 degree).
(a) Perform master cylinder pressure, yaw rate and decelera-
tion sensors zero point calibration.
(1) Using SST, connect terminals Ts and CG of the
DLC3.
SST 09843±18040
(2) Shift the shift lever to the P position.
(3) Turn the ignition switch to the ON position.
(4) Keep the vehicle in a stationary condition on a level
surface for 4 sec. or more.
(5) Keep your foot off the brake pedal.
Do not leave 4WD vehicles in the L4 position.
(6) Press the center diff. lock (TRAC OFF) switch 3
times within 3 seconds.
(7) Check that the VSC buzzer sounds for 3 seconds.
HINT:

If the VSC buzzer does not sound, do the zero point cal-
ibration again and/or check the VSC buzzer circuit (See
page DI±1052).

If the VSC buzzer does not sound, check for yaw rate and
deceleration sensor failure (See page DI±911).
(8) Turn the ignition switch OFF.
(9) Disconnect terminals Ts and CG of the DLC3.
(b) Perform steering angle sensor zero point calibration.
This calibration is carried out automatically by following
procedures below:
(1) Make sure the system is not in sensor check mode.
(2) Calibrate the steering angle sensor by driving the
vehicle in a straight line at more than 7 MPH (12
km/h) for 5 seconds.

F16975
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±909
1103 Author: Date:
2005 SEQUOIA (RM1146U)
Translate ECU:
Symbols (Terminal No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
IG1 (1) ± GND (40)B±R ± OTranslate ECU power
supplyIG SW ON10 to 14 V
PKB2 (4) ± GND (40)LG±R ± OPKB signal lineIG SW ON, PKB SW ONBelow 2.0 V
PKB2 (4) ± GND (40)LG±R ± OPKB signal lineIG SW ON, PKB SW OFF10 to 14 V
VSC+ (7) ± VSC± (11)L ± WCAN communication lineIG switch ONPulse generation
ENG+ (14) ± ENG± (16)R ± WECM communicationIG SW ONPulse generation
SS1+ (18) ± SS1± (19)O ± YSteering angle sensor lineIG SW ONPulse generation
TRIG (20) ± GND (40)W±L ± OSteering angle sensor sig-
nalIG SW ON4.5 to 5.5 V
LVL2 (24) ± GND (40)Y±L ± OBrake fluid level signalBrake fluid level SW ONBelow 1.5 V
CSW (26)* ± GND (40)L±W ± OCenter diff. lock SW sig-
nalIG SW ON, VSC OFF SW ONBelow 1.5 V
CSW (26)* ± GND (40)L±W ± OCenter diff. lock SW sig-
nalIG SW ON, VSC OFF SW OFF8 to 14 V
TS (27) ± GND (40)R±L ± OSensor check inputIG switch ON10 to 14 V
TC (28) ± GND (40)P±B ± ODiagnosis tester commu-
nication lineIG switch ON10 to 14 V
CD (29)* ± GND (40)BR±Y ± OCenter diff. lock lamp sig-
nalIG SW ON, center diff. lock indica-
tor ONBelow 1.5 V
CD (29)* ± GND (40)BR±Y ± OCenter diff. lock lamp sig-
nalIG SW ON, center diff. lock indica-
tor OFF8 to 14 V
EXI2 (31)* ± GND (40)Y±G ± OCenter diff. lock signalIG SW ON, center diff. lock SW ONBelow 1.5 V
EXI2 (31)* ± GND (40)Y±G ± OCenter diff. lock signalIG SW ON, center diff. lock SW
OFF8 to 14 V
IND (37) ± GND (40)W±R ± OSLIP indicator signalIG SW ON, SLIP indicator ONBelow 2.0 V
IND (37) ± GND (40)W±R ± OSLIP indicator signalIG SW ON, SLIP indicator OFF10 to 14 V
WT (38) ± GND (40)R±G ± OVSC OFF or TRAC OFF
warning light circuitIG SW ON, VSC OFF or TRAC
OFF warning light ONBelow 2.0 V
WT (38) ± GND (40)R±G ± OVSC OFF or TRAC OFF
warning light circuitIG SW ON, VSC OFF or TRAC
OFF warning light OFF10 to 14 V
BRL (39) ± GND (40)R±B ± OBRAKE warning light cir-
cuitIG SW ON, BRAKE warning light
ONBelow 2.0 V
BRL (39) ± GND (40)R±B ± OBRAKE warning light cir-
cuitIG SW ON, BRAKE warning light
OFF10 to 14 V
*: Only for 4WD

DI±922
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
111 6 Author: Date:
2005 SEQUOIA (RM1146U)
*1: As long as the following operations are not performed, the ABS warning light will not go OFF only by re-
pairing the trouble area.
(1) Drive the vehicle at 12 mph (20 km/h) for 30 seconds or more and check that the ABS warning light goes
off.
(2) Clear the DTC (See page DI±911).
HINT:
There is a possibility that the hand±held tester cannot be used when the ABS warning light is always ON.
DTC chart of VSC system:
DTC No.
(See Page)Detection ItemTrouble Area
C1201/51
(DI±936)Engine control system malfunction
Engine control system
C1202/52
(DI±937)Brake fluid level warning switch circuit

Brake fluid level

Brake fluid level warning switch

Brake fluid level warning switch circuit

Skid control ECU

CAN1 communication system

Translate ECU
C1203/53 *1
(DI±942)Malfunction in CAN1 communication

Skid control ECU

CAN1 communication system

ECM

Translate ECU
C1207/37
(DI±522)Reverse gear signal failureECT
C1223/43
(DI±945)Malfunction in ABS control systemABS control system
C1231/31
(DI±946)Malfunction in steering angle sensor

Steering angle sensor

Steering angle sensor communication circuit

Skid control ECU

Translate ECU

CAN communication system
C1232/32
(DI±951)Malfunction in deceleration sensor
Yaw rate (deceleration) sensor

Yaw rate (deceleration) sensor circuit
C1234/34
(DI±954)Malfunction in yaw rate sensor
Yaw rate (deceleration) sensor

Yaw rate (deceleration) sensor circuit
C1310/11
(DI±969)Open or short circuit in active brake booster solenoid circuit
Brake booster

Active brake booster solenoid circuit
C1311/12
(DI±971)Open or short circuit in brake inhibit relay circuit
Brake inhibit relay

Brake inhibit relay circuit
1335/35
(DI±946)Malfunction in steering angle sensor communication circuit

Steering angle sensor

Steering angle sensor communication circuit

Skid control ECU

Translate ECU

CAN1 communication system
C1340/47*2
(DI±977)Center diff. lock circuit malfunction

Center diff. lock position switch

Center diff. lock position switch circuit

Center diff. lock indicator light circuit

Translate ECU
C1360/61
(DI±983)Malfunction in master cylinder pressure sensor
Master cylinder pressure sensor

Master cylinder pressure sensor circuit

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±977
1171 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1340 / 47 Center DIFF. Lock Circuit Malfunction
CIRCUIT DESCRIPTION
This circuit sends the signal to the ECU by detecting that the transfer center differential is in the ºLOCKº posi-
tion.
DTC No.DTC Detecting ConditionTrouble Area
C1340 / 47Center diff. lock position switch signal does not change

Center diff. lock position switch

Center diff. lock position switch circuit

Center diff. lock Indicator light circuit

Translate ECU
DIDMD±01

F19774
Translate Shift ActuatorABS & VSC Actuator
(Skid Control ECU)
VSC±
CD
EXI2
CSW VSC+7
T5
11
T5
29
T5
31
T5
26
T5LL
W
BR±Y (4WD)W 7
IL2
6
IL26
S1
2
S1CANH
CANL
Sub J/B No.3
Y±G (4WD)
BR±Y9
3C9
3A
9
3BA10
ADD Actuator
ADDGND
BR±Y Sub J/B No.4
8
4B
7
4A7
4B8
4AL±W
L±W
(4WD)
4WD
Control ECU
4
F23
16
F23
20
F23
11
F23
19
F23
3
F23
6
F23 DL
IND2
IG ADDP1
IND3
IND1Y±B
L±W
BR±Y
L±W
BR±YBR±Y
BR±Y
G±W
Y±B
GR
B±YC6
Combination Meter
Center Diff. Lock
4LO
4HI
24B±OGR GR
GR
GR
W±B
W±B
W±B
W±B
W±B W±B
1
3
D
BEC1
EB5
J51
J526
4EC1
EB5
A
A
A
J41
J/C
IG4 21 B±Y
Instrument Panel J/B I18
Ignition SW
B±O
W±R
W B±Y
B±R
W±R
W±L W±L
W±R4WD
IGN1
AM1 AM1IG1
AM2IG22
64
1C
2
1C
3
1C
6
1C8
1D
11
1H
7
1J
1
1L
12
3
4 J/C
1 2 1
54
5 634 DI±978
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1172 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM