Toyota Sequoia (2005). Manual — part 313
–
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI–1047
1241
5
Check SLIP indicator light.
See combination meter troubleshooting on page
NG
Repair combination meter assembly
(See page
OK
Check and replace skid control ECU
(See page
).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page
).
DI–1048
–
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
1242
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+
IG1
7
T5
11
T5
1
T5
6
S1
2
S1
13
S1
7
IL2
6
IL2
1
IL2
A
J38
A
J37
A
J37
8
3C
8
3A
L
W
B–R
L
W
B–R
B–R
B–R
B–R
B–R
Instrument Panel J/B
4
1C
2
1C
3
1C
6
1C
4
11
1H
7
1J
1
1L
1F
ECU–IG
IGN1
AM1
2
1
AM1
AM2
IG1
IG2
I18
Ignition SW
B–Y
B–R
W–L
W–R
W–L
B–O
W–R
W
1
2
5
6
C6
Combination
Meter
VSC OFF
(4WD)
TRAC OFF
(2WD)
24
2
R–G
W–R
W
Engine Room J/B
1
2D
1
2C
AM2
F10 Fusible
Link Block
B
8
5
4
ALT
R–G
38
T5
26
T5
31
T5
40
T5
WT
CSW
EXI2
GND
(4WD)
Y–G
(4WD)
L–W
Y–B
L–W
Sub J/B No.4
8
4B
7
4B
7
4A
8
4A
16
F23
4
F23
DL
PI
B
Battery
A
A
J43
J/C
IG
J18
J/C
IG
A
A
W–B
W–B
O
O
W–B
W–B
17
IL1
9
IL1
32
S1
1
S1
GND1
GND2
Sub J/B No.3
4WD Control ECU
J/C
(*) CAN1 Circuit
(*)
(*)
(*)
(*)
–
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI–1049
1243
WIRING DIAGRAM
F13991
GND
CSW
*1
Center Integration Panel Assembly
CSW
*2
C3
C6
DI–1050
–
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
1244
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand–held tester and start from step 2 when not using the
hand–held tester.
1
Check operation of the VSC OFF (TRAC OFF) indicator light.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch to the ON position and push the hand–held tester main switch ON.
(c)
Select ACTIVE TEST mode on the hand–held tester.
CHECK:
Check that ”ON” and ”OFF” of the VSC OFF (TRAC OFF) indicator light can be shown on the combination
meter with the hand–held tester.
Item
Vehicle Condition / Test Details
Diagnostic Note
VSC OFF (TRAC OFF)
Turns VSC OFF (TRAC OFF) indicator ON / OFF
Observe combination me-
ter
OK:
VSC OFF (TRAC OFF) indicator light comes on.
NG
Go to step 4.
OK
2
Check center diff. lock (TRAC OFF) switch.
PREPARATION:
Remove center integration panel assembly (See page
CHECK:
Measure the resistance between terminals CSW and GND of
the center diff. lock
*1
(TRAC OFF
*2
) switch when the center diff.
lock
*1
(TRAC OFF
*2
) switch is ON and OFF.
*1
: Only for 4WD
*2
: Only for 2WD
OK:
Center diff. lock (TRAC OFF) switch
Resistance
Press continuously
Continuity
Release
1M
Ω
or higher
NG
Replace center diff. lock (TRAC OFF) switch.
OK
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