2001 TOYOTA SEQUOIA VSC system

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).

F16958
ABS & VSC Actuator
(Skid Control ECU ) M2
Master Cylinder Pressure
Sensor No. 1
VCM
PMC
E1 30
28
29 S1
26
25
27 S1
S1
S1
S1
S1VCM2
PMC2
E2 B
R
W 3
2
1 VCM
PMC
E1
M3
Master Cylinder Pressure
Sensor No. 2
3
2
1 VCM2
PMC2
E2B
R
W (Shielded)
(Shielded)J28
J/C A
A A
AW±B Instrument Panel J/B
W±B
J8
J/C
IE1F1K 912BR
BR
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±983
1177 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1360 / 61 Malfunction in Master Cylinder Pres-
sure Sensor
CIRCUIT DESCRIPTION
The master cylinder pressure sensors are connected to the skid control ECU.
Attached to the master cylinder: one reads front master cylinder pressure and the other reads rear master
cylinder pressure.
DTC No.DTC Detecting ConditionTrouble Area
C1360 / 61
When any of the following conditions are detected:
1. Noise to ECU terminal PMC occurs.
2. While ECU terminal STP is OFF, ECU terminal PMC
voltage is out of standard range.
3. When ECU terminal IG1 voltage is proper, ECU terminal
VCM voltage is out of range.
4. When ECU terminal VCM voltage is proper, ECU termi-
nal PMC voltage is out of range.

Master cylinder pressure sensor

Master cylinder pressure sensor circuit
WIRING DIAGRAM
DI93V±05

DI±984
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1178 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Is pedal lowered or spongy?
YES Bleed air from the system (See page BR±4).
NO
2 Check output value of the master cylinder pressure sensor No. 1 and No. 2.
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 DATA LIST mode on the hand±held tester.
CHECK:
Check that the brake fluid pressure value of the master cylinder pressure sensor displayed on the hand±held
tester changes when depressing the brake pedal.
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
MAS CYL PRS 1
Master cylinder pressure
sensor 1 reading / min.: 0
V, max.: 5 VWhen brake pedal is re-
leased : 0.3 to 0.9 VReading increases when
brake pedal is depressed
MAS CYL PRS 2
Master cylinder pressure
sensor 1 reading / min.: 0
V, max.: 5 VWhen brake pedal is re-
leased : 0.3 to 0.9 VReading increases when
brake pedal is depressed
OK:
Brake fluid pressure value changes.
OK Go to step 4.
NG
3 Check for open and short circuit in harness and connector between master cyl-
inder pressure sensor and skid control ECU (See page IN±35).
NG Repair or replace harness or connector.
OK

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±985
1179 Author: Date:
2005 SEQUOIA (RM1146U)
4 Replace master cylinder pressure sensor and check DTC once more.
PREPARATION:
(a) Replace the master cylinder pressure sensor (See page BR±16).
(b) Clear the DTC (See page DI±911).
(c) Turn the ignition switch OFF.
CHECK:
Turn the ignition switch to the ON position, and check if the same DTC is stored in the memory.
RESULT:
DTC is outputA
DTC is not outputB
B END
A
Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).

DI±986
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1180 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1361 / 62 Abnormal Battery Voltage of VSC Sen-
sor
CIRCUIT DESCRIPTION
Supplies power to the VSC sensors (yaw rate and master cylinder pressure sensors) through terminal IG1.
DTC No.DTC Detecting ConditionTrouble Area
C1361/62Voltage from VSC sensor system to ECU is abnormal.

Battery

Charging system

Power source circuit

Skid control ECU

Yaw rate (deceleration) sensor

Master cylinder pressure sensor
DIDME±01

M2
Master Cylinder
Pressure Sensor No.1
F19776
ABS & VSC Actuator
(Skid Control ECU)
IG1 13
S1 B±R 1
IL1 B±R B±R B±RA
J38 J/C
A
J37 8
3C 8
3ASub J/B No.3
B±RInstrument Panel J/B
4
1F
1
1L4
1C
6
1C ECU±IG
AM1
WB±Y
W±L
B±Y W±LI18
Ignition SW
12
AM1 IG1Y1
Yaw Rate (Deceleration)
Sensor
(Shield)G 5 3R
R12 11
S1
24
S1VYS
GYAW
E1 VYS
GYAW
BR
(Shield)
B
R
W30
S1
28
S1
29
S1VCM
PMC VCM
PMC
E1
BR
A
A
A
BRJ28
J/C Instrument Panel J/B
9
1F12
1KW±B
W±B
BR
J8
J/C
IE IG(Shield)
1 2 3
B
R
W26
S1
25
S1
27
S1VCM2
PMC2
E2 VCM2
PMC2
E2
1
S1
32
S1GND1
GND2 W±B
W±B W±B
W±B17
IL1
9
IL1 A
A J18
J/C 8
5ALTF10
Fusible
Link
Block12
B
Battery
IMA
J18
J/CM3
Master Cylinder
Pressure Sensor No.2G 11
10 IL1
IL1
IL1
1 2
3
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±987
1181 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM