VSC system TOYOTA SEQUOIA 2001 Service Owner's Guide

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

DIDM4±01
DI±916
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
111 0 Author: Date:
2005 SEQUOIA (RM1146U)
FAIL±SAFE CHART
1. FAIL SAFE OPERATION
If there is a problem with sensor signals or actuator systems, the skid control ECU prohibits power supply
to the ABS & VSC actuator and informs the ECM of VSC system failure.
The ABS & VSC actuator turns off each solenoid and the ECM shuts off VSC control (traction control signal)
from the skid control ECU accordingly, which turns out to be as if the ABS, VSC and TRAC systems were
not installed.
The ABS, VSC, and TRAC control will be prohibited, but EBD control continues as much as possible. If EBD
control is impossible, the brake warning light comes on to warn the driver (See page DI±910).
MalfunctionSymptom
ABS systemABS, BA, TRAC, and VSC control prohibited
BA systemABS, BA, TRAC, and VSC control prohibited
EBD systemABS & EBD control prohibited
TRAC systemTRAC and VSC control prohibited
VSC systemTRAC and VSC control prohibited
HINT:

A malfunction in either the ABS or BA system will result in an identical operation, with ABS, BA, TRAC,
and VSC system control prohibited.

If control is prohibited due to a malfunction during operation, control will be disabled gradually. This
is to avoid sudden vehicle instability.

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

DI±918
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
111 2 Author: Date:
2005 SEQUOIA (RM1146U)
DECELERAT SEN
Deceleration sensor 1
reading / min.: ±1.869 G,
max.: 1.869 GApproximately 0 ± 0.13 G
at still conditionReading changes when ve-
hicle is bounced
DECELERAT SEN2
Deceleration sensor 2
reading / min.: ±1.869 G,
max.: 1.869 GApproximately 0 ± 0.13 G
at still conditionReading changes when ve-
hicle is bounced
IG VOLTAGE
ECU power supply voltage
/ TOO LOW / NORMAL /
TOO HIGHTOO LOW : 9.5 V or less
NORMAL : 9.5 to 14.0 V
TOO HIGH : 14.0 V or
more
±
SFRRABS solenoid (SFRR) / ON
or OFFON : Operated
OFF : Not operated±
SFRHABS solenoid (SFRH) / ON
or OFFON : Operated
OFF : Not operated±
SFLRABS solenoid (SFLR) / ON
or OFFON : Operated
OFF : Not operated±
SFLHABS solenoid (SFLH) / ON
or OFFON : Operated
OFF : Not operated±
SRRR (SRR)ABS solenoid (SRRR
(SRR)) / ON or OFFON : Operated
OFF : Not operated±
SRRH (SRH)ABS solenoid (SRRH
(SRH)) / ON or OFFON : Operated
OFF : Not operated±
SRLRABS solenoid (SRLR) / ON
or OFFON : Operated
OFF : Not operated±
SRLHABS solenoid (SRLH) / ON
or OFFON : Operated
OFF : Not operated±
SRMR (SMCR, STR)SRMR (SMCR, STR) / ON
or OFFON : Operated
OFF : Not operated±
SRMF (SMCF SA3)SRMF (SMCF, SA3) / ON
or OFFON : Operated
OFF : Not operated±
SRCR (SA2)SRCR (SA2) / ON or OFFON : Operated
OFF : Not operated±
SRCF (SA1)SRCF (SA1) / ON or OFFON : Operated
OFF : Not operated±
YAW RATE
Yaw rate sensor/
Min.: ±128 deg/s, Max.:
127 deg/sMin.: ±128 deg/s
Max.: 128 deg/s±
YAW ZERO VALUE
Memorized zero value/
Min.: ±128 deg/s, Max.:
127 deg/sMin.: ±128 deg/s
Max.: 128 deg/s±
STEERING ANG
Steering sensor/
Min.: ±1152 deg,
Max.: 1150.875 degLeft turn: Increase
Right turn: Decrease±
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 2 reading / min.: 0
V, max.: 5 VWhen brake pedal is re-
leased: 0.3 to 0.9 VReading increases when
brake pedal is depressed
PEDAL STROKEPedal Stroke Sensor min.:
0, max.: 5.1Approximately 2.0 V with-
out the brake pedal de-
pressed
±

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±919
111 3 Author: Date:
2005 SEQUOIA (RM1146U)
2. ACTIVE TEST
HINT:
Performing the ACTIVE TEST using the hand±held tester allows the relay, actuator, etc. to operate without
removing any parts. Performing the ACTIVE TEST as the first step of troubleshooting is one of the methods
to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) According to the display on the tester, perform the ACTIVE TEST.
HINT:
The Ignition switch must be turned to the ON position to proceed to the ACTIVE TEST using the hand±held
tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
SFRRTurns ABS solenoid (SFRR) ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SFRHTurns ABS solenoid (SFRH) ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SFLRTurns ABS solenoid (SFLR) ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SFLHTurns ABS solenoid (SFLH) ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SRRRTurns ABS solenoid (SRRR) ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SRRHTurns ABS solenoid (SRRH) ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SRLRTurns ABS solenoid (SRLR) ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SRLHTurns ABS solenoid (SRLH) ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SRMR (SMCR, STR)Turns TRAC solenoid (SRMR) ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SRMF (SMCF, SA3)Turns TRAC solenoid (SRMF) ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SRCR (SA2)Turns TRAC solenoid (SRCR) ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SRCF (SA1)Turns TRAC solenoid (SRCF) ON / OFF
Operation of solenoid
(clicking sound) can be
heard
ABS MOT RELAYTurns ABS motor relay ON / OFFOperation of motor (click-
ing sound) can be heard
ABS WARN LIGHTTurns ABS warning light ON / OFFObserve combination me-
ter

DI±920
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
111 4 Author: Date:
2005 SEQUOIA (RM1146U)
VSC WARN LIGHTTurns VSC warning light ON / OFFObserve combination me-
ter
VSC / TRC OFF INDTurns VSC / TRAC OFF indicator ON / OFFObserve combination me-
ter
SLIP INDI LIGHTTurns SLIP indicator light ON / OFFObserve combination me-
ter
BRAKE WRN LIGHTTurns BRAKE warning light ON / OFFObserve combination me-
ter
VSC / BR WARN BUZTurns VSC / BRAKE warning buzzer ON / OFFBuzzer can be heard
SFRR & SFRHTurns ABS solenoid SFRR & SFRH ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SFLR & SFLHTurns ABS solenoid SFLR & SFLH ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SRH & SRRTurns ABS solenoid SRH & SRR ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SRLR & SRLHTurns ABS solenoid SRLR & SRLH ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SFRH & SFLHTurns ABS solenoid SFRH & SFLH ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SRCF & SRCRTurns ABS solenoid SRCF & SRCR ON / OFF
Operation of solenoid
(clicking sound) can be
heard
SRMF & SRMRTurns ABS solenoid SRMF & SRMR ON / OFF
Operation of solenoid
(clicking sound) can be
heard

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±922
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
111 6 Author: Date:
2005 SEQUOIA (RM1146U)
*1: As long as the following operations are not performed, the ABS warning light will not go OFF only by re-
pairing the trouble area.
(1) Drive the vehicle at 12 mph (20 km/h) for 30 seconds or more and check that the ABS warning light goes
off.
(2) Clear the DTC (See page DI±911).
HINT:
There is a possibility that the hand±held tester cannot be used when the ABS warning light is always ON.
DTC chart of VSC system:
DTC No.
(See Page)Detection ItemTrouble Area
C1201/51
(DI±936)Engine control system malfunction
Engine control system
C1202/52
(DI±937)Brake fluid level warning switch circuit

Brake fluid level

Brake fluid level warning switch

Brake fluid level warning switch circuit

Skid control ECU

CAN1 communication system

Translate ECU
C1203/53 *1
(DI±942)Malfunction in CAN1 communication

Skid control ECU

CAN1 communication system

ECM

Translate ECU
C1207/37
(DI±522)Reverse gear signal failureECT
C1223/43
(DI±945)Malfunction in ABS control systemABS control system
C1231/31
(DI±946)Malfunction in steering angle sensor

Steering angle sensor

Steering angle sensor communication circuit

Skid control ECU

Translate ECU

CAN communication system
C1232/32
(DI±951)Malfunction in deceleration sensor
Yaw rate (deceleration) sensor

Yaw rate (deceleration) sensor circuit
C1234/34
(DI±954)Malfunction in yaw rate sensor
Yaw rate (deceleration) sensor

Yaw rate (deceleration) sensor circuit
C1310/11
(DI±969)Open or short circuit in active brake booster solenoid circuit
Brake booster

Active brake booster solenoid circuit
C1311/12
(DI±971)Open or short circuit in brake inhibit relay circuit
Brake inhibit relay

Brake inhibit relay circuit
1335/35
(DI±946)Malfunction in steering angle sensor communication circuit

Steering angle sensor

Steering angle sensor communication circuit

Skid control ECU

Translate ECU

CAN1 communication system
C1340/47*2
(DI±977)Center diff. lock circuit malfunction

Center diff. lock position switch

Center diff. lock position switch circuit

Center diff. lock indicator light circuit

Translate ECU
C1360/61
(DI±983)Malfunction in master cylinder pressure sensor
Master cylinder pressure sensor

Master cylinder pressure sensor circuit

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±923
111 7 Author: Date:
2005 SEQUOIA (RM1146U)C1361/62
(DI±986)
Abnormal battery voltage of VSC sensor

Battery

Charging system

Power source circuit

Yaw rate (deceleration) sensor

Skid control ECU

Master cylinder pressure sensor
C1362/36
(DI±990)Malfunction in sensor offset value (VSC sensor system)Skid control ECU
(Perform zero point calibration)
C1363/63
(DI±991)Malfunction in booster pedal force switch
Booster pedal force switch (Active brake booster)

Booster pedal force switch (Active brake booster) circuit
U0100/65
(DI±1075)Malfunction in vehicle CAN communication system
Vehicle CAN communication system
HINT:
There is a possibility that the hand±held tester cannot be used when the VSC TRAC warning light is always
ON.
*
1: Check DTC chart C1203/53 first, then troubleshoot according to the DTC chart of translate ECU if neces-
sary.
*
2:
4WD
DTC chart of translate ECU (When DTC ºC1201/51, C1202/52, C1203/53 or U0100/65º of VSC system
is output):
DTC No.
(See Page)Detection ItemTrouble Area
Normal code*
(DI±1013)Malfunction in ECM control system or suspension control ECU

ECM circuit

ECM

Brake fluid level

Brake fluid level warning switch circuit

Steering angle sensor

Translate ECU

Skid control ECU

Vehicle CAN

VSC+, VSC± circuit (CAN1 communication system)
51
(DI±995)Malfunction in ECM control system
ECM
53
(DI±998)Malfunction in CAN1 communication

VSC+, VSC± circuit (CAN1 communication system)

Skid control ECU

Translate ECU
58
(DI±1002)Malfunction of brake fluid level switch

Brake fluid level warning switch circuit

Brake fluid level warning switch

Brake fluid reservoir level

Translate ECU
65
(DI±1005)Malfunction 1 of vehicle CAN

ENG+, ENG± circuit (CAN communication system)

ECM

Translate ECU

Suspension control ECU
94
(DI±1009)Malfunction 2 of vehicle CAN

ENG+, ENG± circuit (CAN communication system)

ECM

Translate ECU

Suspension control ECU
Non±code
(DI±1015)Malfunction in translate ECU

Brake warning light circuit

Tc terminal circuit

Translate ECU
*: Translate ECU is normal.