2001 TOYOTA SEQUOIA wheel

DIDM5±01
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±917
1111 Author: Date:
2005 SEQUOIA (RM1146U)
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
With the hand±held tester connected to the DLC3 and the ignition switch in the ON position, the ABS, TRAC
and VSC data list can be displayed. Follow the prompts on the tester screen to access the DATA LIST.
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
ABS MOT RELAYABS motor relay / ON or
OFFON : Motor relay ON
OFF : Motor relay OFF±
SOL RELAYSolenoid relay / ON or
OFFON : Solenoid relay ON
OFF : Solenoid relay OFF±
VSC / TRC OFF SWTRAC control switch / ON
or OFF
ON : TRAC control switch
ON
OFF : TRAC control switch
OFF
±
AIR BLD SUPPORTAir bleed support / ON or
OFFON : Support ON
OFF : Support OFF±
STOP LIGHT SWStop lamp switch / ON or
OFF
ON : Brake pedal de-
pressed
OFF : Brake pedal re-
leased
±
PKB SWParking brake switch / ON
or OFFON : Parking brake applied
OFF : Parking brake re-
leased
±
ABS OPERT FRABS operation (FR) / BE-
FORE or OPERATE
BEFORE : No ABS opera-
tion (FR)
OPERATE : During ABS
operation (FR)
±
ABS OPERT FLABS operation (FL) / BE-
FORE or OPERATE
BEFORE : No ABS opera-
tion (FL)
OPERATE : During ABS
operation (FL)
±
ABS OPERT RRABS operation (RR) / BE-
FORE or OPERATE
BEFORE : No ABS opera-
tion (RR)
OPERATE : During ABS
operation (RR)
±
ABS OPERT RLABS operation (RL) / BE-
FORE or OPERATE
BEFORE : No ABS opera-
tion (RL)
OPERATE : During ABS
operation (RL)
±
WHEEL SPD FR
Wheel speed sensor (FR)
reading / min.: 0 km/h (0
MPH), max.: 326 km/h
(202 MPH)
Actual wheel speedSimilar speed as indicated
on speedometer
WHEEL SPD FL
Wheel speed sensor (FL)
reading / min.: 0 km/h (0
MPH), max.: 326 km/h
(202 MPH)
Actual wheel speedSimilar speed as indicated
on speedometer
WHEEL SPD RR
Wheel speed sensor (RR)
reading / min.: 0 km/h (0
MPH), max.: 326 km/h
(202 MPH)
Actual wheel speedSimilar speed as indicated
on speedometer
WHEEL SPD RL
Wheel speed sensor (RL)
reading / min.: 0 km/h (0
MPH), max.: 326 km/h
(202 MPH)
Actual wheel speedSimilar speed as indicated
on speedometer

DI93C±06
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±921
111 5 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
NOTICE:

When removing parts, turn the ignition switch OFF.

When replacing the master cylinder, yaw rate and deceleration sensors and/or the ECU, make
sure to perform master cylinder, yaw rate and deceleration sensors' zero point calibration (See
page DI±897).
HINT:

Using SST 09843±18040, connect terminals Tc and CG.

If no abnormality is found when inspecting parts, inspect the ECU.

If a trouble code is displayed during the DTC check, check the circuit listed for that code. For details
of each code, turn to the page referred to under the ºSee pageº for respective ºDTC No.º in the DTC
chart.
DTC chart of ABS system:
DTC No.
(See Page)Detection ItemTrouble Area
C0200/31*1
(DI±925)Right front wheel speed sensor signal malfunction
C0205/32*1
(DI±925)Left front wheel speed sensor signal malfunction
Right front, left front, right rear and left rear speed sensor

Each speed sensor circuit
C0210/33*1
(DI±925)Right rear wheel speed sensor signal malfunction

Each s eed sensor circuit

Speed sensor rotor

Skid control ECU
C0215/34*1
(DI±925)Left rear wheel speed sensor signal malfunction
C0226/21
(DI±932)Malfunction in ABS & VSC solenoid valves
ABS & VSC actuator

ABS & VSC solenoid circuit
C0278/11
(DI±934)Open or short circuit in ABS & VSC relay circuit

ABS & VSC solenoid relay

ABS & VSC solenoid relay circuit

ABS & VSC motor relay

ABS & VSC motor relay circuit
C1241/41
(DI±957)Low battery positive voltage or abnormally high battery positive
voltage

Battery

Charging system

Power source circuit (+BM, +BS)

Skid control ECU
C1244/44
(DI±951)Open or short circuit in deceleration sensor circuit
Yaw rate (deceleration) sensor

Yaw rate (deceleration) sensor circuit
C1247/47
(DI±960)Malfunction in delta S sensor

Delta S sensor

Delta S sensor circuit

Skid control ECU

Brake booster
C1249/49
(DI±963)Open circuit in stop light switch circuit

Stop light switch

Stop light switch circuit

Skid control ECU
C1251/51*1
(DI±966)
Pump motor is locked
Open circuit in pump motor circuit
ABS & VSC actuator
C1337/37
(DI±975)Some tires are different in size from the other tires
Tire size
Always ON
(DI±1016)Malfunction in skid control ECU

Battery

Charging system

Power source circuit

ABS warning light circuit

Skid control ECU

DI±924
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
111 8 Author: Date:
2005 SEQUOIA (RM1146U)
If the brake warning light turns on, check that the parking brake pedal is released, the brake fluid level is
normal, and no malfunction is identified in the fluid level warning switch system.
If there is a problem with VSC, the brake warning light comes on. The possible causes of a problem are as
follows:

2 or more wheel speed sensor failures

Low/high voltage

Valve failure

DI93G±05
BR3583
BR3582F00010
RotorSpeed Sensor
Magnet
To ECU
+V
±VHigh Speed
Low Speed
CoilNS
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±925
111 9 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
DTC
C0200 / 31 ± C0215 / 34Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
the ABS control system. The front and rear rotors have 48
serrations each.
When the rotors rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates AC voltage. Since
the frequency of this AC voltage changes in direct proportion to
the speed of the rotor, the frequency is used by the ECU to de-
tect the speed of each wheel.

DTC No.DTC Detecting ConditionTrouble Area
C0200 / 31
C0205 / 32
C0210 / 33
C0215 / 34
When any of the following is detected:
1. During driving, speed sensor signals are not input for a
fixed time.
2. Momentary interruption in speed sensor signals occurs
many times during driving.
3. Abnormal signal occurs in pulse signal from speed sen-
sor during driving.
4. Speed sensor signal circuit continues to be open for a
fixed time.

Right front, left front, right rear and left rear speed sensor

Each speed sensor circuit

Sensor rotor

Skid control ECU
HINT:
DTC No. C0200 / 31 is for the right front speed sensor.
DTC No. C0205 / 32 is for the left front speed sensor.
DTC No. C0210 / 33 is for the right rear speed sensor.
DTC No. C0215 / 34 is for the left rear speed sensor.

± 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

W04200
Normal Signal Waveform
1 V / Division2 m/s / DivisionGND
R07880
DI±930
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1124 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check speed sensor and sensor rotor serrations.
INSPECTION USING OSCILLOSCOPE
PREPARATION:
Connect the oscilloscope to the terminal FR+ ± FR±, FL+ ± FL±,
RR+ ± RR± and RL+ ± RL± of the skid control ECU.
CHECK:
Drive the vehicle at about 12 mph (20 km/h), and check the sig-
nal waveform.
OK:
A waveform as shown in the figure should be output.
HINT:

As the vehicle speed (wheel revolution speed) increases,
a cycle of the waveform becomes shorter and the fluctua-
tion in the output voltage becomes greater.

When noise is identified in the waveform on the oscillo-
scope, error signals are generated due to the speed sen-
sor rotor's scratches, looseness or foreign matter depos-
ited on it.
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
6 Check sensor rotor and sensor tip.
Front:
PREPARATION:
Remove the disc (See page SA±22).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign objects.
PREPARATION:
Remove the front speed sensor (See page BR±56).
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
HINT:
Remove any foreign matter if identified.
Check the output waveform again after reassembly.

F19768
F10
Fusible Link Block
ABS
B
5
3B±R47
S1
W±B17
IL1W±B1
S1
W±BW±B A
A
J18
J/C
Battery
IG9
IL132
S1+BS
GND2ABS&VSC Actuator (Skid Control ECU)
IFL
IFR
IRL
IRR
OFL
OFR
ORL
ORR
ASR1
SV1
SV2
BATT ASR2 GND1Skid Control ECU DI±932
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1126 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C0226 / 21 ABS & VSC Solenoid Circuit
CIRCUIT DESCRIPTION
This solenoid turns on when signals are received from the ECU and controls the pressure acting on the wheel
cylinders to control braking force.
DTC No.DTC Detecting ConditionTrouble Area
C0226 / 21Solenoid valve signal does not match the check result.
ABS & VSC actuator

ABS & VSC solenoid circuit
WIRING DIAGRAM
DI93H±03

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