2001 TOYOTA SEQUOIA ECU

± 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

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).