steering wheel TOYOTA SEQUOIA 2001 Service Owner's Manual
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 2001, Model line: SEQUOIA, Model: TOYOTA SEQUOIA 2001Pages: 4323, PDF Size: 48.49 MB
Page 1096 of 4323
DIDLX±01
DI±894
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1088 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. SYSTEM DESCRIPTION
HINT:
The yaw rate sensor and deceleration sensor are combined and in a single unit. This unit communi-
cates with the skid control ECU through the CAN communication system.
No changes have been made to the communication method between the VSC system and ECM. How-
ever, the communication method between the Translate ECU and ECM has been changed from serial
to CAN communication.
(a) ABS
(Anti±lock Brake System)
The ABS helps prevent the wheels from locking when the brakes are applied firmly or when braking
on a slippery surface.
(b) EBD
(Electronic Brake force Distribution)
The EBD control utilizes ABS, realizing proper brake force distribution between front and rear wheels
in accordance with driving conditions.
In addition, during braking while cornering, it also controls the brake forces of the right and left wheels,
helping to maintain vehicle behavior.
(c) BA (Brake Assist)
The primary purpose of the brake assist system is to provide an auxiliary brake force to assist the driver
who cannot generate a large enough brake force during emergency braking, thus helping to maximize
the vehicle's braking performance.
(d) TRAC
(Traction Control)
The TRAC system helps prevent the drive wheels from slipping if the driver presses down on the accel-
erator pedal excessively when starting off or accelerating on a slippery surface.
(e) VSC
(Vehicle Stability Control)
The VSC system helps prevent the vehicle from slipping sideways as a result of strong front wheel skid
or strong rear wheel skid during cornering.
2. ABS with EBD & BA & TRAC & VSC OPERATION
(a) The skid control ECU calculates vehicle stability tendency based on signals from the speed sensor,
yaw rate (deceleration) sensor and steering angle sensor. In addition, it evaluates the results of the
calculations to determine whether any control actions (control of the engine output torque by electronic
throttle control and of the wheel brake pressure by the brake actuator) should be implemented.
(b) The SLIP indicator blinks and the VSC buzzer sounds to inform the driver that the VSC system is oper-
ating. The SLIP indicator also blinks when TRAC is operating, and the operation being performed is
displayed.
3. FAIL SAFE FUNCTION
(a) When a failure occurs in the ABS & BA & TRAC & VSC systems, the ABS and VSC warning lights come
on and ABS & BA & TRAC & VSC operations are prohibited. In addition to this, when there is a failure
that disables EBD operation, the brake warning light also comes on and EBD operation is prohibited.
(b) If some control is prohibited due to a malfunction during its operation, that control will be cut off gradual-
ly not to change the stability of the vehicle suddenly.
Page 1100 of 4323
DI±898
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1092 Author: Date:
2005 SEQUOIA (RM1146U)
(3) Stop the vehicle. Use the hand±held tester to check
that the steering angle value on the DATA LIST in-
creases when the steering wheel is turned left, and
decreases when turned right.
(4) Turn the ignition switch OFF.
HINT:
If the steering angle reads 1,150 degrees when the steer-
ing wheel is in any position, the sensor has not been cali-
brated.
Carry out the calibration procedure again.
DTC C1362/36 will be output from the skid control ECU
if the skid control ECU is replaced with a new one and/or
sensor calibration is not performed.
DTC C1362/36 will be deleted when sensor calibration is
complete.
Page 1101 of 4323
DIDLZ±01
F09750
DLC3Ts
CG
BR3904
0.13 sec. 0.13 sec.
ON
OFF
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±899
1093 Author: Date:
2005 SEQUOIA (RM1146U)
TEST MODE PROCEDURE
1. When not using the hand±held tester:
SENSOR CHECK (TEST MODE)
NOTICE:
When having replaced the master cylinder pressure, yaw
rate and deceleration sensors and/or the ECU, perform
zero point calibration of the master cylinder pressure, yaw
rate and deceleration sensors (See page DI±897).
HINT:
If the ignition switch is turned from the ON to the ACC or LOCK
position in test mode, test mode DTCs will be erased.
(a) Procedures for test mode:
(1) Turn the ignition switch OFF.
(2) Check that the shift lever is in the P position, and
turn the steering wheel to the neutral position.
(3) Using SST, connect terminals Ts and CG of the
DLC3.
SST 09843±18040
(4) Start the engine.
(5) Check that the ABS and VSC TRAC warning lights
blink.
HINT:
If the ABS and VSC TRAC warning lights do not blink, inspect
the ABS warning light circuit, VSC TRAC warning light circuit
and Ts terminal circuit.
(6) Keep the vehicle in a stationary condition on a level
surface for 4 sec. or more.
ABS warning light circuitDI±1021 or DI±1025
VSC TRAC warning light circuitDI±1027 or DI±1031
Ts terminal circuitDI±1057
Page 1102 of 4323
F02135
Start Position
End PositionWithin ± 5° DI±900
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1094 Author: Date:
2005 SEQUOIA (RM1146U)
(b) Check the yaw rate and deceleration sensor.
Shift the shift lever to the D position and drive the vehicle
at a vehicle speed of approx. 3 mph (5 km/h), turn the
steering wheel either to the left or right for 90° or more,
and turn the vehicle through 180 degrees. Check that the
VSC buzzer sounds for 3 seconds upon start off.
Stop the vehicle and shift the shift lever to the P position,
and check that the VSC buzzer sounds again for 3 se-
conds.
HINT:
If the VSC buzzer sounds twice, the sensor check has
been completed normally.
If the VSC buzzer does not sound, check the VSC buzzer
circuit (See page DI±1052), then do the sensor check
again.
Drive the vehicle through 180°. At the end of the turn, the
direction of the vehicle should be within 180° ± 5° of its
start position.
Do not spin the wheels.
If the buzzer sounds after start off, then the deceleration
sensor check has passed its check. If the buzzer sounds
at the completion of a curve, then the yaw rate sensor
check has passed its check. The buzzer sound should be
heard twice during the sensor checks.
(c) Check the master cylinder pressure sensor.
(1) Turn the ignition switch to the ON position.
(2) Keep the vehicle in a stationary condition on a level
surface for 2 sec. or more.
(3) Keeping the vehicle in a stationary condition and
not pressing on the brake pedal for 1 sec. or more,
depress the brake pedal with 147 N (15 kgf, 33 lbf)
or more for 2 sec. or more.
NOTICE:
If zero point calibration has never been performed on a new
ECU, master cylinder pressure sensor check cannot be
completed correctly. Perform zero point calibration first
(See page DI±897).
HINT:
At this time, the buzzer sounds for 3 seconds.
(d) Check the speed sensor.
Drive the vehicle straight forward.
When driving the vehicle at the speed of 28 mph (45 km/h)
or higher for several seconds, check that the ABS warn-
ing light goes off.
HINT:
There is a possibility that the sensor check is not completed if
the vehicle has its wheels spun or its steering wheel turned dur-
ing this check.
(e) Stop the vehicle.
Page 1104 of 4323
D05981
Hand±held
Tester
DLC3
BR3904
0.13 sec. 0.13 sec.
ON
OFF
F02135
Start Position
End PositionWithin ± 5° DI±902
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1096 Author: Date:
2005 SEQUOIA (RM1146U)
2. When using the hand±held tester:
SENSOR CHECK (TEST MODE)
NOTICE:
When having replaced the master cylinder pressure, yaw
rate and deceleration sensors and/or ECU, perform zero
point calibration of the master cylinder pressure, yaw rate
and deceleration sensors (See page DI±897). Make sure
that this operation is done before performing the following.
(a) Procedures for test mode:
(1) Connect the hand±held tester to the DLC3.
(2) Check that the shift lever is in the P position, and
turn the steering wheel to the neutral position.
(3) Start the engine.
(4) Select the SIGNAL CHECK on the hand±held tes-
ter.
(5) Check that the ABS warning light and VSC TRAC
warning light blink.
HINT:
If the ABS and VSC TRAC warning lights do not blink, inspect
the ABS warning light circuit, VSC TRAC warning light circuit
and Ts terminal circuit.
(6) Keep the vehicle in a stationary condition on a level
surface for 4 sec. or more.
ABS warning light circuitDI±1021 or DI±1025
VSC TRAC warning light circuitDI±1027 or DI±1031
Ts terminal circuitDI±1057
(b) Check the yaw rate and deceleration sensor.
Shift the shift lever to the D position and drive the vehicle
at a vehicle speed of approx. 3 mph (5 km/h), turn the
steering wheel either to the left or right for 90° or more,
and turn the vehicle through 180 degrees. Check that the
VSC buzzer sounds for 3 seconds upon start off.
Stop the vehicle and shift the shift lever to the P position,
check that the VSC buzzer sounds again for 3 seconds.
Page 1105 of 4323
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±903
1097 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:
If the VSC buzzer sounds twice, the sensor check has
been completed normally.
If the VSC buzzer does not sound, check the VSC buzzer
circuit (see page DI±1052), then do the sensor check
again.
Drive the vehicle through 180°. At the end of the turn its
check, the direction of the vehicle should be within 180°
± 5° of its start position.
Do not spin the wheels.
If the buzzer sounds after start off, then the deceleration
sensor check has passed its check. If the buzzer sounds
at the completion of a turn its check, then the yaw rate
sensor check has passed. The buzzer sound should be
heard during the sensor checks.
(c) Check the master cylinder pressure sensor.
(1) Turn the ignition switch to the ON position.
(2) Keep the vehicle in a stationary condition on a level
surface for 2 sec. or more.
(3) Keeping the vehicle in a stationary condition and
not pressing on the brake pedal for 1 sec. or more,
depress the brake pedal with 147 N (15 kgf, 33 lbf)
or more for 2 sec. or more on a new ECU.
NOTICE:
If zero point calibration has never been performed on a new
ECU, master cylinder pressure sensor check cannot be
completed correctly. Perform zero point calibration first
(See page DI±897).
HINT:
At this time, the buzzer sounds for 3 seconds.
(d) Check the speed sensor.
Drive the vehicle straight forward.
When driving the vehicle at the speed of 28 mph (45 km/h)
or higher for several seconds, check that the ABS warn-
ing light goes off.
HINT:
There is a case that the sensor check is not completed if the ve-
hicle has its wheels spun or its steering wheel turned during this
check.
(e) Stop the vehicle.
(f) Read the DTC by following the prompts on the tester
screen.
HINT:
Refer to the hand±held tester operator's manual for further de-
tails.
Page 1110 of 4323
F19198
Skid Control ECU
(harness side connector) DI±908
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1102 Author: Date:
2005 SEQUOIA (RM1146U)Symbols (Terminal No.) Terminal Description
TS (40)Sensor check input
+BO (41)Steering angle sensor line
RL+ (42)RL wheel speed signal line
RL± (43)RL wheel speed signal line
VSCW (44)VSC OFF indicator output
FR± (45)FR wheel speed signal line
FR+ (46)FR wheel speed signal line
+BS (47)Solenoid relay power supply
2. Terminal Inspection
Disconnect the connector and measure the voltage on the wire harness side.
HINT:
Voltage can not be measured with the connector connected to the skid control ECU as the connector is water
resistance.
Symbols (Terminal No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
+BM (16) ± GND1, 2 (1, 32)B±R ± W±BMotor relay power supplyIG switch ON10 to 14 V
GYAW (24) ± GND1, 2 (1, 32)G ± W±BYaw rate sensor groundAlwaysBelow 1 W
E3 (8) ± GND1, 2 (1, 32)L ± W±BM/C pressure sensor 3
groundAlwaysBelow 1 W
E2 (27) ± GND1, 2 (1, 32)W ± W±BM/C pressure sensor 2
groundAlwaysBelow 1 W
E1 (29) ± GND1, 2 (1, 32)W ± W±BM/C pressure sensor 1
groundAlwaysBelow 1 W
STP (39) ± GND1, 2 (1, 32)G±Y ± W±BStop light switch signal in-
putBrake pedal depressed8 to 14 V
STP (39) ± GND1, 2 (1, 32)G±Y ± W±BStop light switch signal in-
putBrake pedal releasedBelow 1.5 V
+BS (47) ± GND1, 2 (1, 32)B±R ± W±BSolenoid relay power sup-
plyIG switch ON10 to 14 V
Page 1116 of 4323
DIDM3±01
DI±914
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1108 Author: Date:
2005 SEQUOIA (RM1146U)
FREEZE FRAME DATA
1. FREEZE FRAME DATA
HINT:
Whenever a DTC is detected or the ABS operates, the skid control ECU stores the current vehicle (sen-
sor) state as freeze frame data.
The skid control ECU stores the number of times (maximum: 31) the ignition switch has been turned
from off to the ON position since the last time the ABS was activated. However, if the vehicle was
stopped or at low speed (4.3 mph (7 km/h) or less), or if a DTC is detected, the skid control ECU will
not count the number since then.
Freeze frame data at the time the ABS operates:
The skid control ECU stores and updates data whenever the ABS system operates.
When the ECU stores data at the time a DTC is detected, the data stored when the ABS operated is
erased.
Freeze frame data at the time a DTC is detected:
When the skid control ECU stores data at the time a DTC is detected, no updates will be performed
until the data is cleared.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) From the display on the tester, select the ºFREEZE FRAME DATAº.
Hand±held Tester DisplayMeasurement ItemReference Value
VEHICLE SPDWheel speed sensor readingmin.: 0 km/h
max.: 326 km/h
STOP LIGHT SWStop light switch signalStop light switch ON: ON, OFF: OFF
# IG ONNumber of operations of ignition switch ON after
memorizing freeze frame data0 to 31
MAS CYL PRESSMaster cylinder pressure sensor readingBrake pedal released: 0.3 to 0.9 V
Brake pedal depressed: 0.8 to 4.5 V
MASS PRESS GRADEMaster cylinder pressure sensor change±30 to 255 MPa/s
SYSTEMSystem status
ABS activated: ABS
VSC/TRC activated: VSC/TRC
BA activated: BA
Fail safe mode activated: FAIL SF
No system activated: NO SYS
YAW R AT EYaw rate angle sensor reading±128 to 127
STEERING ANGSteering sensor readingLeft turn: Increase
Right turn: Drop
THROTTLETh ttl iti diRelease accelerator pedal: Approx. 0 deg.THROTTLEThrottle position sensor readingRelease accelerator edal: A rox. 0 deg.
Depress accelerator pedal: Approx. 125 deg.
G (RIGHT & LEFT)Right and left G±1.869 to 1.869
G (BACK & FORTH)Back and forth G±1.869 to 1.869
VSC / TRC OFF SWVSC OFF switch signalTRAC OFF SW ON: ON
OFF: OFF
SHIFT POSITIONShift lever position
FAIL
P, N
R
D
4
3
2
L
TROUBLE CODEFreeze DTCmin.: 0
max.: 255
Page 1150 of 4323
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
Page 1321 of 4323
DIDGH±01
H24019
Spiral CableFront Passenger
Airbag Assembly
Side Airbag Assembly LH (*1)
Front Seat
Outer Belt LH
Side Airbag Sensor
Assembly LH (*1)Side Airbag
Assembly RH (*1)
Front Airbag
Sensor LH Steering Wheel
PadFront Airbag
Sensor RH
Curtain Shield Airbag
Assembly RH (*1) Curtain Shield Airbag
Assembly LH (*1)
Curtain Shield Airbag
Sensor Assembly RH (*1)
SRS Warning Light
Side Airbag Sensor
Assembly RH (*1)
Front Seat
Outer Belt RH
RSCA OFF Indicator (*1)Passenger Airbag
ON/OFF Indicator Integration Control and Panel: Combination Meter:
Seat Position
Airbag Sensor
Assembly
Curtain Shield Airbag
Sensor Assembly LH (*1)
Occupant Classification ECU
Front Seat Inner Belt RH
Front Seat Inner Belt LH
Airbag Sensor Assembly*1: w/ Side and Curtain Shield Airbag
RSCA OFF
Switch (*1)
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1119
1313 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION