TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±939
1133 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check brake fluid level.
CHECK:
Check the amount of fluid in the brake reservoir.
NG Check and repair brake fluid leakage and add
fluid.
OK
2 Check DTC of translate ECU (translate DTC 58).
CHECK:
Check DTC of the translate ECU (See page DI±911).
RESULT:
DTC 58 is not outputA
DTC 58 is outputB
B Go to step 4.
A
3 Check for open and short circuit in harness and connector between skid control
ECU and translate ECU (CAN1 circuit).
NG Repair or replace harness or connector
(CAN1 circuit).
OK
Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform zero point calibration (See page DI±897).

F18069
DI±940
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1134 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check brake fluid level warning switch.
PREPARATION:
Disconnect the brake fluid level warning switch connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSwitch ConditionSpecified Condition
(B2±1) ± (B2±2)Float UP10 kW or more
(No continuity)
(B2±1) ± (B2±2)Float DOWN1 W or less (Continuity)
NG Replace brake reservoir tank.
OK
5 Check for open and short circuit in harness and connector between brake fluid
level warning switch and translate ECU (See page IN±35).
NG Repair or replace harness or connector.
OK

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±941
1135 Author: Date:
2005 SEQUOIA (RM1146U)
6 Replace the translate ECU and check if 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 C1202/52 is outputA
DTC C1202/52 is not outputB
B END
A
Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform zero point calibration (See page DI±897).

F19770
Translate ECU
VSC± VSC+
ENG±ENG+ABS & VSC Actuator
(Skid Control ECU)
7
T5
11
T5
14
T5
16
T57
IL2
6
IL2 L
WL
W6
S1
2
S1CANH
CANL
R
WL
W 1
J55
2
J551
J53
2
J53 J/C
33
E5
34
E5CANH
CANLECM (*1)
(*1)
(*2)
(*2)
(*1) CAN1 Circuit(*2) Vehicle CAN Circuit (*1)
(*1)
(*2)
(*2) DI±942
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1136 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1203 / 53 Malfunction in CAN1 Communication
CIRCUIT DESCRIPTION
This circuit is used to send TRAC & VSC control information from the skid control ECU to the ECM (CAN
communication system) and engine control information from the ECM to the skid control ECU (CAN commu-
nication system).
The skid control ECU and ECM are connected to each other via the translate ECU using the CAN commu-
nication system.
DTC No.DTC Detecting ConditionTrouble Area
C1203 / 53Data cannot be transmitted and/or received to/from ECM
from translate ECU for a fixed time.

Skid control ECU

CAN1 communication system

ECM

Translate ECU
WIRING DIAGRAM
DI93J±04

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±943
1137 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check engine control system.
CHECK:
Check engine control system (See page DI±43).
RESULT:
DTC is not outputA
DTC is outputB
B Repair engine control system according to the
output code (See page DI±58).
A
2 Check DTC of translate ECU.
CHECK:
Check DTC of the translate ECU (See page DI±911).
RESULT:
DTC is output (53, 65, 94)A
DTC is not outputB
B Go to step 4.
A
3 Check for open and short circuit in harness and connector between skid control
ECU and translate ECU (CAN1 circuit).
NG Repair or replace harness or connector
(CAN1 circuit).
OK

DI±944
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1138 Author: Date:
2005 SEQUOIA (RM1146U)
4 Replace the translate ECU and check if 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
Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform zero point calibration (See page DI±897).

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±945
1139 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1223 / 43 Malfunction in ABS Control System
CIRCUIT DESCRIPTION
HINT:
This DTC is output when the VSC system detects a malfunction in the ABS system.
DTC No.DTC Detecting ConditionTrouble Area
C1223 / 43ABS control system is abnormal.ABS control system
INSPECTION PROCEDURE
1 Check DTC (See page DI±911).
PREPARATION:
(a) Clear the DTC.
(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 No problem.
A
Repair circuit indicated by output code
(See page DI±921).
DI93K±03

DI±946
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1140 Author: Date:
2005 SEQUOIA (RM1146U)
DTCC1231 / 31, C1335 / 35Steering Angle Sensor Circuit
CIRCUIT DESCRIPTION
The steering angle sensor signal is sent to the skid control ECU via the CAN communication system. When
there is a malfunction in the communication system, the DTCs will be detected by the diagnosis function.
DTC No.DTC Detecting ConditionTrouble Area
C1231 / 31Data is not transmitted to the steering angle sensor for a
fixed time invalid steering angle sensor data.

Translate ECU

Steering angle sensor

Steering angle sensor communication circuit

Skid control ECU

CAN communication system
C1335 / 35
When the +BS terminal voltage is 9.5 V or more, data trans-
mission from the steering angle sensor is impossible for 1
sec. or more.

Translate ECU

Steering angle sensor

Steering angle sensor to translate ECU circuit

Skid control ECU

CAN1 communication system
DI93L±04

F19771
F10
Fusible Link BlockInstrument Panel J/BI18
Ignition SWABS & VSC Actuator
(Skid Control ECU)
ALT
B
58W1
1L
1AM1
6
1C
2
4
1F4
1C Sub J/B No.3
8
3C8
3AW±L
12
ECU±IGAM1IG1
B±Y B±R
B±R
B±RB±R
B±R B±RA
J37A
J38
A
J37A
J371
IL113
S1 IG1
1 S7
Steering Angel Sensor
IG
TRIG
SS1±
SS1+
BAT
ESS10
11
3
9
B
BatteryW±L
Y
OL
WL
W Translate ECU
20
T5
19
T5
18
T5
40
T5
1 T5
7
T5
11
T5 TRIG
SS1±
SS1+
GNDIG1
VSC+
VSC±IL2
6
IL26
S1
2
S1
O
P±L P±L
P±L
W±B7
IL2 12
IL1 17
IL19W±B
W±B
W±B41
S1
S1
32
S1CANH
CANL
+BO
GND1
GND2 O
O
O A
A
AA
A
J43
J/CJ18
J/C
IG
IG1 J/C
2
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±947
1141 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

DI±948
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1142 Author: Date:
2005 SEQUOIA (RM1146U)
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 output value of the steering angle sensor.
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) Check that the steering wheel is centered.
(d) Select DATA LIST mode on the hand±held tester.
CHECK:
Check that the steering wheel turning angle value of the steering angle sensor displayed on the hand±held
tester changes when turning the steering wheel.
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
STEERING ANG
Steering sensor/
Min.: ±1152 deg,
Max.: 1150.875 degLeft turn: Increase
Right turn: Decrease±
OK:
Turn the steering wheel to the left: Value increases
Turn the steering wheel to the right: Value decreases
HINT:
If the steering sensor zero point calibration is not performed, its value will be fixed to 1,150 deg.
Check after driving the vehicle straight ahead at a speed of 6.5 mph (10.5 km/h) or more.
OK Go to step 7.
NG
2 Check the installation condition of the steering angle sensor.
CHECK:
Check steering angle sensor installation condition.
OK:
Steering angle sensor installed correctly.
NG Repair or replace steering angle sensor.
NOTICE:
If the steering angle sensor has been replaced, drive the
vehicle straight ahead at a speed of 6.5 mph (10.5 km/h) or
more to calibrate the steering angle sensor.
OK