2001 TOYOTA SEQUOIA 4WD

DIDM1±01
F13444
USA: CANADA:USA: CANADA:2WD: 4WD:
DI±910
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1104 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. CHECK WARNING LIGHT
(a) Release the parking brake pedal.
(b) When the ignition switch is turned ON, check that the ABS
warning light, VSC TRAC warning light, VSC OFF (TRAC
OFF) indicator light, BRAKE warning light and SLIP indi-
cator light come on for approx. 3 seconds.
HINT:

When the parking brake is applied or the level of the brake
fluid is low, the BRAKE warning light comes on.

If the indicator check result is not normal, proceed to trou-
bleshooting for the ABS warning light circuit, VSC TRAC
warning light circuit, VSC OFF (TRAC OFF) indicator light
circuit, BRAKE warning light circuit or SLIP indicator light
circuit.
Trouble AreaSee page
ABS warning light circuitDI±1021 or
DI±1025
VSC TRAC warning light circuitDI±1027 or
DI±1031
VSC OFF (TRAC OFF) indicator light circuitDI±1048
BRAKE warning light circuitDI±1033 or
DI±1038
SLIP indicator light circuitDI±1041 or
DI±1045

The DTCs are simultaneously stored in the memory. The
DTCs can be read by connecting the SST between TC
and CG terminals of the DLC3 and observing the blinking
of the ABS and VSC warning lights, or by connecting a
hand±held tester.

This system has a sensor signal check function (TEST
MODE) (See page DI±899).
The DTC can be read by connecting the SST between ter-
minals TS and CG of the DLC3 and observing the blinking
of the ABS and VSC TRAC warning lights, or by connect-
ing a hand±held tester.

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±923
111 7 Author: Date:
2005 SEQUOIA (RM1146U)C1361/62
(DI±986)
Abnormal battery voltage of VSC sensor

Battery

Charging system

Power source circuit

Yaw rate (deceleration) sensor

Skid control ECU

Master cylinder pressure sensor
C1362/36
(DI±990)Malfunction in sensor offset value (VSC sensor system)Skid control ECU
(Perform zero point calibration)
C1363/63
(DI±991)Malfunction in booster pedal force switch
Booster pedal force switch (Active brake booster)

Booster pedal force switch (Active brake booster) circuit
U0100/65
(DI±1075)Malfunction in vehicle CAN communication system
Vehicle CAN communication system
HINT:
There is a possibility that the hand±held tester cannot be used when the VSC TRAC warning light is always
ON.
*
1: Check DTC chart C1203/53 first, then troubleshoot according to the DTC chart of translate ECU if neces-
sary.
*
2:
4WD
DTC chart of translate ECU (When DTC ºC1201/51, C1202/52, C1203/53 or U0100/65º of VSC system
is output):
DTC No.
(See Page)Detection ItemTrouble Area
Normal code*
(DI±1013)Malfunction in ECM control system or suspension control ECU

ECM circuit

ECM

Brake fluid level

Brake fluid level warning switch circuit

Steering angle sensor

Translate ECU

Skid control ECU

Vehicle CAN

VSC+, VSC± circuit (CAN1 communication system)
51
(DI±995)Malfunction in ECM control system
ECM
53
(DI±998)Malfunction in CAN1 communication

VSC+, VSC± circuit (CAN1 communication system)

Skid control ECU

Translate ECU
58
(DI±1002)Malfunction of brake fluid level switch

Brake fluid level warning switch circuit

Brake fluid level warning switch

Brake fluid reservoir level

Translate ECU
65
(DI±1005)Malfunction 1 of vehicle CAN

ENG+, ENG± circuit (CAN communication system)

ECM

Translate ECU

Suspension control ECU
94
(DI±1009)Malfunction 2 of vehicle CAN

ENG+, ENG± circuit (CAN communication system)

ECM

Translate ECU

Suspension control ECU
Non±code
(DI±1015)Malfunction in translate ECU

Brake warning light circuit

Tc terminal circuit

Translate ECU
*: Translate ECU is normal.

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

DI±980
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1174 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check center differential lock operation (See page TR±39).
OK:
Center differential lock operation is norm.
NG Repair or replace one±touch 2±4 selector sys-
tem.
OK
2 Check operation of the center differential lock indicator light.
PREPARATION:
(a) Turn the ignition switch to the ON position.
(b) Set the transfer to the L4 position.
CHECK:
Check that pressing the center differential lock switch locks the differential and turns the lock indicator on.
OK:
Indicator light: ON/OFF or OFF/ON
HINT:
When the center differential cannot be shifted to LOCK smoothly, the center differential lock indicator light
will blink.
NG Repair or replace center differential lock indica-
tor light circuit.
OK
3 Check that the 4WD ECU connectors are securely connected to the 4WD ECU.
NO Connect the connector to the 4WD ECU.
YES

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±981
1175 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check for open and short circuit in harnesses and connectors between termi-
nals CD of the translate ECU and IND of the 4WD control ECU, EXI2 of the trans-
late ECU and detection SW (See page IN±35).
NG Repair or replace harness or connector.
OK
5 Replace the translate ECU and check if the trouble occurs again.
PREPARATION:
(a) Clear the DTC (See page DI±911).
(b) Turn the ignition switch OFF.
CHECK:
Turn the ignition switch to the ON position, and check if the same DTC still remains in the memory.
RESULT:
DTC is outputA
DTC is not outputB
B END
A

DI±982
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1176 Author: Date:
2005 SEQUOIA (RM1146U)
6 Replace skid control ECU and check if the trouble occurs again
(See page BR±52 and DI±911).
PREPARATION:
(a) Clear the DTC (See page DI±911).
(b) Turn the ignition switch OFF.
CHECK:
Turn the ignition switch to the ON position, and check if the same DTC still remains in the memory.
RESULT:
DTC is outputA
DTC is not outputB
B END
A
Check and replace 4WD control ECU.
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).

DI±1048
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1242 Author: Date:
2005 SEQUOIA (RM1146U)
VSC OFF *1 (TRAC OFF)*2 Indicator Light, Center Diff. Lock *1
(TRAC OFF)*2 Switch Circuit
*1: Only for 4WD
*
2: Only for 2WD
CIRCUIT DESCRIPTION
This is the VSC (TRAC) control main switch. When the center diff. lock (TRAC OFF) switch is pushed on,
VSC (TRAC) indicator goes off and the VSC OFF (TRAC OFF) indicator comes on. Turn the ignition switch
OFF, and check that the VSC (TRAC) indicator comes on when turning the ignition switch to the ON position
again.
Pressing the center diff. lock switch in 2WD mode does not deactivate VSC control. *
1
DI948±04

F19780
ABS & VSC Actuator
(Skid Control ECU)
Translate ECU
CANH
CANL
IG1 VSC± VSC+
IG17
T5
11
T5
1
T56
S1
2
S1
13
S1 7
IL2
6
IL2
1
IL2 A
J38
A
J37 A
J37
8
3C8
3A L
W
B±RL
W
B±R
B±R
B±R B±R
B±R Instrument Panel J/B
4
1C
2
1C
3
1C
6
1C4
11
1H
7
1J
1
1L 1F ECU±IG
IGN1
AM1
21 AM1
AM2IG1
IG2 I18
Ignition SW
B±Y
B±R W±L
W±R
W±LB±O
W±R
W 12
56C6
Combination
Meter
VSC OFF
(4WD)
TRAC OFF
(2WD)
24
2
R±G W±R W
Engine Room J/B
1
2D1
2C AM2 F10 Fusible
Link Block
B 8
54 ALT
R±G 38
T5
26
T5
31
T5
40
T5 WT
CSW
EXI2
GND
(4WD)
Y±G
(4WD)
L±W
Y±B L±WSub J/B No.4
8
4B
7
4B7
4A8
4A16
F23
4
F23DL
PI
B
BatteryA
AJ43
J/C
IGJ18
J/C
IG A
A W±B W±B
O
OW±B
W±B 17
IL1
9
IL132
S11
S1GND1
GND2 Sub J/B No.3
4WD Control ECU J/C (*) CAN1 Circuit
(*)
(*)(*) (*)
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1049
1243 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM