2001 TOYOTA SEQUOIA DLC3 Ts

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±927
1121 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 speed 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) Select DATA LIST mode on the hand±held tester.
CHECK:
Check that there is no difference between the speed value output from the speed sensor displayed by the
hand±held tester and the speed value displayed by the speedometer when driving the vehicle.
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
WHEEL SPD FR
Wheel speed sensor (FR)
reading / min.: 0 MPH (0
km/h), max.: 202 MPH
(326 km/h)
Actual wheel speedSimilar speed as indicated
on speedometer
WHEEL SPD FL
Wheel speed sensor (FR)
reading / min.: 0 MPH (0
km/h), max.: 202 MPH
(326 km/h)
Actual wheel speedSimilar speed as indicated
on speedometer
WHEEL SPD RR
Wheel speed sensor (FR)
reading / min.: 0 MPH (0
km/h), max.: 202 MPH
(326 km/h)
Actual wheel speedSimilar speed as indicated
on speedometer
WHEEL SPD RL
Wheel speed sensor (FR)
reading / min.: 0 MPH (0
km/h), max.: 202 MPH
(326 km/h)
Actual wheel speedSimilar speed as indicated
on speedometer
OK:
There is almost no difference from the displayed speed value.
HINT:
There is tolerance of + 10 % in the speedometer indication.
OK Go to step 4.
NG

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

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

F19784
Torque: 5 N´m (10 kgf´cm, 3.7ft´lbf)
F16996
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±955
1149 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check the yaw rate sensor installation.
CHECK:
Check the yaw rate sensor installation.
OK:
The sensor should be tightened to the specified
torque.
The sensor should not be tilted.
NG Install yaw
rate sensor correctly.
OK
2 Check output value of the yaw rate sensor.
PREPARATION:
(a) Remove the 2 bolts and the yaw rate sensor 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 the DATA LIST mode on the hand±held tester.
CHECK:
Check that the yaw rate value of the yaw rate sensor displayed
on the hand±held tester changes: Place the yaw rate sensor
vertically to the ground and turn the sensor to the right and left.
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
YAW RATE
Yaw rate sensor/
Min.: ±128 deg/s, Max.:
127 deg/sMin.: ±128 deg/s
Max.: 128 deg/s±
OK:
Yaw rate value changes.

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

F19800
(1): Brake Pedal
Depressed
(2): Brake Pedal
Released Voltage
Time 4.5 V
1.9 V
0.5 V(2)
(1)
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±961
1155 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in the case of using the hand±held tester and start from step 2 in the case
of not using the hand±held tester.
1 Check output value of the delta S sensor (pedal stroke speed sensor) using the
hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Run the engine until the engine speed reaches 3,000 rpm, and return it back to idle.
HINT:
Rev up the engine to ensure sufficient vacuum.
(d) Select DATA LIST mode on the hand±held .
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
PEDAL STROKEPedal stroke sensor/
min.: 0 V, max.: 5.1 V
Approximately 2.0 V with-
out the brake pedal de-
pressed.
±
HINT:

The result appears on the tester after some delay because a time lag occurs in measurement with a
hand±held tester.

If a signal from the delta S sensor is sent between sampling, the result does not appear on the tester.
So be sure to perform the measurement 2 or 3 times.
CHECK:
Check that the brake pedal acceleration value of the delta S sensor displayed on the hand±held tester
changes, alternatively increasing the brake pedal stroke.
OK:
The value changes as shown in the illustration on the
left. (The value will return to approximately 2.0 V after
the brake pedal is released.)
HINT:
The maximum voltage depends on pedal stroke speed but
should not exceed 4.5 V or fall below 0.2 V.
OK Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform zero point
calibration (See page DI±897).
NG

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

DI±1020
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1214 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check operation of the ABS warning light.
When using the hand±held tester:
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 ACTIVE TEST mode on the hand±held tester.
CHECK:
Check that ºONº and ºOFFº of the ABS warning light can be shown on the combination meter by the hand±
held tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
ABS WARN LIGHTTurns ABS warning light ON / OFFObserve combination me-
ter
OK:
ABS warning light operates.
When not using the hand±held tester:
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the connector from the skid control ECU.
(c) Turn the ignition switch to the ON position.
CHECK:
Check the ABS warning light comes on.
OK:
ABS warning light comes on.
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).
NG
7 Check ABS warning light.
See combination meter troubleshooting on page DI±1614.
NG Repair combination meter assembly
(See page DI±1610).
OK
Check for short circuit in harness and connector between ABS warning light and skid control
ECU (See page IN±35).

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1021
1215 Author: Date:
2005 SEQUOIA (RM1146U)
ABS Warning Light Circuit (Remains ON)
CIRCUIT DESCRIPTION
If the ECU detects trouble, it turns on the ABS warning light and prohibits ABS control. At this time, the ECU
records a DTC in memory.
Connect terminals Tc and CG of the DLC3 to make the ABS warning light blink and indicate the DTC.
DI944±04