speed sensor TOYOTA SEQUOIA 2001 Service Repair Manual

± 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.

DI±904
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1098 Author: Date:
2005 SEQUOIA (RM1146U)
3. DTC of ABS sensor check function:
Code No.DiagnosisTrouble Area
C1271 / 71Low output voltage of right front speed sensor

Right front speed sensor

Sensor installation

Sensor rotor
C1272 / 72Low output voltage of left front speed sensor

Left front speed sensor

Sensor installation

Sensor rotor
C1273 / 73Low output voltage of right rear speed sensor

Right rear speed sensor

Sensor installation

Sensor rotor
C1274 / 74Low output voltage of left rear speed sensor

Left rear speed sensor

Sensor installation

Sensor rotor
C1275 / 75Abnormal change in output voltage of right front speed sen-
sorRight front speed sensor rotor
C1276 / 76Abnormal change in output voltage of left front speed sen-
sorLeft front speed sensor rotor
C1277 / 77Abnormal change in output voltage of right rear speed sen-
sorRight rear speed sensor rotor
C1278 / 78Abnormal change in output voltage of left rear speed sensorLeft rear speed sensor rotor
C1279 / 79Deceleration sensor is faulty
Deceleration sensor

Sensor installation
C1281 / 81Master cylinder pressure sensor output signal is faultyMaster cylinder pressure sensor
HINT:
Read the number of blinks of the ABS warning light.
DTC of VSC sensor check function:
Code No.DiagnosisTrouble Area
C0371 / 71Yaw rate sensor output signal malfunction
Yaw rate sensor

Yaw rate sensor circuit
HINT:
Read the number of blinks of the VSC TRAC warning light.

DI93F±04
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±905
1099 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
If a normal code is indicated during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
NOTICE:

When replacing the skid control ECU, sensor, etc., turn the ignition switch OFF.

When replacing the master cylinder pressure, yaw rate and deceleration sensors and/or the
ECU, make sure to perform master cylinder pressure, yaw rate, and deceleration sensors' zero
point calibration (See page DI±897).
SymptomSuspected AreaSee page
ABS does not operate
When the following 1. to 4. are all normal and the problem
is still occurring, replace the skid control ECU.
1. Check the DTC reconfirming that the normal code is
output.
2. IG power source circuit
3. Speed sensor circuit
4. Check the hydraulic circuit for leakage.
DI±911
DI±957
DI±925
DI±1059
ABS does not operate efficiently
When the following 1. to 4. are all normal and the problem
is still occurring, replace the skid control ECU.
1. Check the DTC reconfirming that the normal code is
output.
2. Speed sensor circuit
3. Stop light switch circuit
4. Check the hydraulic circuit for leakage.
DI±911
DI±925
DI±963
DI±1059
ABS warning light abnormal
1. ABS warning light circuit
2. Skid control ECUDI±1021 or
DI±1025
BRAKE warning light abnormal
1. BRAKE warning light circuit
2. Skid control ECU
3. Translate ECUDI±1033 or
DI±1038
DTC check cannot be done
When the following 1. to 3. are all normal and the problem
is still occurring, replace the skid control ECU.
1. ABS warning light circuit
2. Tc terminal circuit
3. VSC TRAC warning light circuit
DI±1021 or
DI±1025
DI±1055
DI±1027
DI±1031
Speed sensor signal check cannot be done1. Ts terminal circuit
2. Skid control ECUDI±1057
TRAC does not operate
Only when 1. to 4. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. IG power source circuit
3. Check the hydraulic circuit for leakage
4. Speed sensor circuit
DI±911
DI±957
DI±1059
DI±925
TRAC does not operate efficiently
Only when 1. to 3. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. Check the hydraulic circuit for leakage
3. Speed sensor circuit
DI±911
DI±1059
DI±925

DI±906
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1100 Author: Date:
2005 SEQUOIA (RM1146U) VSC does not operate
Only when 1. to 9. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. Perform zero point calibration
3. IG power source circuit
4. Check the hydraulic circuit for leakage
5. Speed sensor circuit
6. Deceleration sensor circuit
7. Yaw rate sensor circuit
8. Steering angle sensor circuit
9. Master cylinder pressure sensor circuit
DI±911
DI±897
DI±957
DI±1059
DI±925
DI±951
DI±954
DI±946
DI±983
VSC does not operate efficiently
Only when 1. to 8. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. Perform zero point calibration
3. Check the hydraulic circuit for leakage
4. Speed sensor circuit
5. Deceleration sensor circuit
6. Yaw rate sensor circuit
7. Steering angle sensor circuit
8. Master cylinder pressure sensor circuit
DI±911
DI±897
DI±1059
DI±925
DI±951
DI±954
DI±946
DI±983
VSC TRAC warning light abnormal
1. VSC TRAC warning light circuit
2. Skid control ECUDI±1027 or
DI±1031
SLIP indicator light abnormal
1. SLIP indicator light circuit
2. Skid control ECUDI±1041 or
DI±1045
VSC OFF (TRAC OFF) indicator abnormal
1. VSC OFF (TRAC OFF) indicator light circuit
2. VSC OFF (TRAC OFF) switch circuit
3. Skid control ECUDI±1048

DIDM0±01
F16974
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±907
1101 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
1. Skid Control ECU:
Symbols (Terminal No.)Terminal Description
GND (1)Skid control ECU ground
CANL (2)Vehicle CAN communication line
VCP (3)Pedal stroke sensor (Delta S Sensor) line
CANH (6)Vehicle CAN communication line
E3 (8)Pedal stroke sensor (Delta S Sensor) ground
VYS (11)Yaw rate sensor power source
IG1 (13)IG1 power supply
PIM (14)Pedal stroke sensor (Delta S Sensor) line
D/G (15)Diagnosis tester communication line
+BM (16)Motor relay power supply
BST (17)Brake booster line
PSNC (18)Brake booster line
SS1 (19)Yaw rate sensor signal line
STS (20)Brake booster line
PSNO (21)Brake booster line
BZ (22)Buzzer output
SS2 (23)Yaw rate sensor signal line
GYAW (24)Yaw rate sensor ground
PMC2 (25)M/C pressure sensor 2 signal
VCM2 (26)M/C pressure sensor 2 power supply
E2 (27)M/C pressure sensor 2 ground
PMC (28)M/C pressure sensor 1 signal
E1 (29)M/C pressure sensor 1 ground
VCM (30)M/C pressure sensor 1 power supply
BSTP (31)Brake booster line
GND2 (32)Skid control ECU ground
FL+ (33)FL wheel speed signal line
FL± (34)FL wheel speed signal line
WA (35)ABS warning light output
RR± (36)RR wheel speed signal line
RR+ (37)RR wheel speed signal line
BSW (38)Brake inhibit signal line
STP (39)Stop light switch signal input

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

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

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±915
1109 Author: Date:
2005 SEQUOIA (RM1146U)# CODES
Number of trouble codesmin.: 0
max.: 255
PEDAL STROKEPedal stroke sensor readingmin.: 0 V
max.: 5.1 V
STROKE GRADEPedal stroke sensor changemin.: ±2560
max.: 2550
SPD GRADESpeed sensor grademin.: ±1.869
max.: 1.869

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