2001 TOYOTA SEQUOIA ABS

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

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±949
1143 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check for open and short circuit in harness and connector between steering
angle sensor and translate ECU (See page IN±35).
NG Repair or replace harness or connector.
OK
4 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
5 Is DTC still output?
Check DTC on page DI±911.
NO No problem.
YES

DI±950
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1144 Author: Date:
2005 SEQUOIA (RM1146U)
6 Replace the skid control ECU and check if trouble occurs again.
PREPARATION:
(a) Clear the DTC.
(b) Turn the ignition switch OFF.
CHECK:
Check if the same DTC still remains in the memory.
RESULT:
DTC is outputA
DTC is not outputB
B END.
A
Replace steering angle sensor.
NOTICE:

When replacing the skid control ECU, perform the zero point calibration (See page DI±897).

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.
7 Check DTC once more (See page DI±911).
PREPARATION:
(a) Clear the DTC.
(b) Turn the ignition switch OFF.
CHECK:
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 with actuator
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).

F16952
VYS
SS1
GYAW S1
23 R
B
W
IM BRIL112
1911
3
12 Y1
Yaw Rate (Deceleration)
SensorABS & VSC Actuator
(Skid Control ECU)
(Shielded)S1
S1
(Shielded) VYS
YAW 1
GYAWR
B
W
SS2
S1 24 IL1
IL1
IL1
IL143
11
10 G
G YAW 2
5(*)
(*)
(*) CAN2 Circuit(*)
(*)
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±951
1145 Author: Date:
2005 SEQUOIA (RM1146U)
DTCC1232 / 32, C1244 / 44Deceleration Sensor Circuit
CIRCUIT DESCRIPTION
The skid control ECU receives signals from the yaw rate sensor (deceleration sensor) via the CAN2 commu-
nication system.
The yaw rate sensor has a built±in deceleration sensor.
This sensor detects deceleration on the vehicle. The sensor signal is used in ABS & BA & TRAC & VSC
control.
DTC No.DTC Detecting ConditionTrouble Area
C1232 / 32When the lateral deceleration output becomes 4.8 V or
more or 0.2 V or less per 0.5 second.
Yaw rate (Deceleration) sensor

Yaw rate (Deceleration) sensor circuit
C1244 / 44
When any of the following conditions are detected:
1. When the supplied voltage to the yaw rate & decelera-
tion sensor becomes 18 V or more or 6.5 V or less.
2. When the longitudinal deceleration output becomes 4.8
V or more or 0.2 V or less per 0.5 second.

Yaw rate (Deceleration) sensor

Yaw rate (Deceleration) sensor circuit
WIRING DIAGRAM
DIDM8±01

F19784
Torque: 5 N´m (10 kgf´cm, 3.7ft´lbf)
F19199
DI±952
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1146 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check the yaw rate (deceleration) sensor installation.
CHECK:
Check the yaw rate (deceleration) sensor installation.
OK:
The sensor should be tightened to the specified
torque.
The sensor should not be tilted.
NG Install yaw
rate (deceleration) sensor correctly.
OK
2 Check output value of the yaw rate sensor.
PREPARATION:
(a) Remove the 2 bolts and the yaw rate (deceleration) sen-
sor assembly with the connector still connected.
(b) Connect the hand±held tester to the DLC3.
(c) Turn the ignition switch to the ON position and push the
hand±held tester main switch ON.
(d) Select DATA LIST mode on the hand±held tester.
CHECK:
Check that the decelerate value of the deceleration sensor dis-
played on the hand±held tester changes: Place the decelera-
tion sensor vertically to the ground and turn the sensor to the
frontward and rearward.
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
DECELERAT SENS
Deceleration sensor 1
reading / min.: ±1.869 G,
max.: 1.869 GApproximately 0 ± 0.13 G
while stationaryReading changes when ve-
hicle is bounced
DECELERAT SENS2
Deceleration sensor 2
reading / min.: ±1.869 G,
max.: 1.869 GApproximately 0 ± 0.13 G
while stationaryReading changes when ve-
hicle is bounced
OK:
Decelerate value changes.

NG Replace yaw rate (deceleration) sensor.
NOTICE:
When replacing the yaw rate (deceleration) sensor, per-
form the zero point calibration (See page DI±897).
OK

F19145
Yaw Rate (Decel-
eration) Sensor
VYS
GYAW
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±953
1147 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check voltage between terminals VYS and GYAW of the yaw rate (deceleration)
sensor.
PREPARATION:
Disconnect the yaw rate (deceleration) sensor connecter.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage between terminals VYS and GYAW
of the yaw rate (deceleration) sensor harness side con-
nector.
OK:
Voltage: 10 to 14 V
OK Check and replace yaw rate
(deceleration)
sensor.
NOTICE:
When replacing the yaw rate sensor, perform the zero point
calibration (See page DI±897).
NG
4 Check for open and short circuit in harness and connector between yaw rate
sensor and skid control ECU (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).