2001 TOYOTA SEQUOIA solenoid

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

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

F19782
Battery16
S1+BS
GND1
GND2
+BM S1
S1 S1 47
1
32 B±R
B±R
W±B
W±B W±B W±B 5 BF10
Fusible Link BlockABS & VSC Actuator
(Skid Control ECU)
IG J18
J/C
A A3
ABS
Motor Relay
Pump
Motor IL117
IL19 DI±934
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1128 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C0278 / 11 ABS & VSC Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS & VSC solenoid. If the initial check is OK, then the relay turns on after
the ignition switch is turned ON.
DTC No.DTC Detecting ConditionTrouble Area
C0278 / 11Relay circuit continues to be open for a fixed time when
solenoid relay is ON after ignition switch is turned ON.

ABS & VSC solenoid relay

ABS & VSC solenoid relay circuit

ABS & VSC motor relay

ABS & VSC motor relay circuit
WIRING DIAGRAM
DI93I±03

F14399F16956
BSTP
BST 3S1 31
17 4 A9
Active Brake BoosterABS &VSC Actuator
(Skid Control ECU)
BSTP
BSTS1 G±B
LG±B
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±969
1163 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1310 / 11 Open or Short Circuit in Active Brake
Booster Solenoid Circuit
CIRCUIT DESCRIPTION
Operates when booster's negative pressure is insufficient and allows for a stable braking control.
DTC No.DTC Detecting ConditionTrouble Area
C1310 / 11Open or short in active brake booster solenoid circuit.
Brake booster

Active brake booster solenoid circuit
WIRING DIAGRAM
DI93R±04

F13988
34
DI±970
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1164 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check active brake booster solenoid.
PREPARATION:
Disconnect the connector from the brake booster.
CHECK:
Check resistance between terminals 3 and 4 of the brake boost-
er.
OK:
Resistance: 1.1 to 1.7 W
NG Replace brake booster.
OK
2 Check for open and short circuit in harness and connector between skid control
ECU and brake booster (See page IN±35).
NG Repair or replace harness or connector.
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).

DIDFN±01
B78765I28978
Battery
Serial Communication Switch
ECUOn On
Off
ECULight
Motor
Heater
Solenoid
Conceptual Drawing 
I28977
Frame
Data
Header End Message
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1889
2083 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
Basic of MPX (Multiplex Communication)
1. General
The SEQUOIA multiplex communication system uses serial communication, which converts multiple pieces
of information into serial communication data. As a result, they can be transmitted through a single commu-
nication wire.
Serial communication data consists of bits and frames. A bit is the basic unit that represents the amount of
information. A bit is represented by a binary value º0º or º1º. A frame is a body of data that is transmitted
together. A frame contains a ºheaderº that indicates the beginning of the data and an ºend messageº that
indicates the end of the data.

AT131±01
D14123
Clutch No.2 (C2) Clutch No.3 (C
3)
Clutch No.1 (C
1)One±way Clutch
No.1 (F1)
One±way Clutch
No.2 (F
2)
Brake No.3
(B
3)
Brake No.1 (B1)
Brake No.2 (B2)One±way Clutch
No.3 (F
3)Brake No.4 (B4)
Shift Solenoid Valve SLT
Shift Solenoid Valve SL1Shift Solenoid Valve S1
Shift Solenoid Valve S2Shift Solenoid Valve SR Shift Solenoid Valve SL2Shift Solenoid Valve SLU
AT±2
± AUTOMATIC TRANSMISSION (A750E, A750F)AUTOMATIC TRANSMISSION SYSTEM
2910 Author: Date:
2005 SEQUOIA (RM1146U)
OPERATION

D13867
AT134±01
D12704
Orange
Blue
Clamp
ClampBolt
Bolt
D12739
D12704
Orange
Blue
Clamp
Clamp
A B
± AUTOMATIC TRANSMISSION (A750E, A750F)ATF TEMPERATURE SENSOR
AT±7
2915 Author: Date:
2005 SEQUOIA (RM1146U)
ATF TEMPERATURE SENSOR
ON±VEHICLE REPAIR
1. DRAIN AUTOMATIC TRANSMISSION FLUID
(a) Remove the drain plug and gasket, and drain the ATF.
(b) Install a new gasket and the drain plug.
Torque: 20 N´m (204 kgf´cm, 15 ft´lbf)
2. REMOVE OIL PAN (See page AT±10)
3. REMOVE OIL STRAINER (See page AT±10)
4. REMOVE ATF TEMPERATURE SENSOR
(a) Disconnect the 7 solenoid valve connectors.
(b) Remove the 2 bolts, clamps and ATF temperature sen-
sors.
(c) Disconnect the transmission wire connector.
(d) Remove the bolt and the transmission wire harness.
5. INSTALL ATF TEMPERATURE SENSOR
(a) Install the transmission wire harness.
(b) Install the bolt.
Torque: 5.4 N´m (55 kgf´cm, 48 in.´lbf)
(c) Connect the transmission wire connector.
(d) Connect the 7 solenoid valve connectors.
(e) Install the 2 ATF temperature sensors and clamps to the
valve body with the 2 bolts.
HINT:
In order to install the ATF temperature sensors properly, check
the wire harness color prior to installation.
Torque:
A: 11 N´m (112 kgf´cm, 8 ft´lbf)
B: 10 N´m (100 kgf´cm, 7 ft´lbf)
Bolt length:
Bolt A: 36 mm (1.42 in.)
Bolt B: 12 mm (0.47 in.)
Sensor wire harness:
Wire harnessColor
for linear controlOrange
for oil temp. warning lampBlue
6. INSTALL OIL STRAINER (See page AT±10)