2001 TOYOTA SEQUOIA ABS

DI±994
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1188 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check for open and short circuit in harness and connector between booster ped-
al force switch and skid control ECU (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).

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±995
1189 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 51 Malfunction in ECM Control System
CIRCUIT DESCRIPTION
The circuit is used to send TRAC & VSC control information from the skid control ECU to the ECM, and en-
gine control information from the ECM to the skid control ECU via the vehicle CAN and CAN1 communication
system.
This DTC is output when the engine control system failure signal is received from the ECM.
DTC No.DTC Detecting ConditionTrouble Area
51Translate ECU receives the engine control system failure
signal from ECM for 5 sec. or more.
ECM
DIDMG±01

F19196
E5
ECM
CANL
CANH34
33W
L2
J53
1
J532
J55
1
J55 J/C
W
R16
T5
14
T5ENG±
ENG+
VSC+
VSC± 7
T5
11
T5 L
W WL7
IL2
6
IL2 26 S1 ABS & VSC Actuator
(Skid Control ECU)Translate
ECU
IG1 1
T5 B±R
J37 J37J/C Sub J/B No.3
8
3C 8
3AB±R
B±R
B±Y
W±L I18
Ignition SW
WInstrument Panel J/B
4
1F
1
1L4
1C
6
1C ECU±IG
AM1
AM1 IG1
ALT
BatteryGND 40
T5 J43
J/C
O
A A O
IG1
2 CANH
CANL
A
A
8
5
BF10
Fusible Link
Block
12(*1)
(*1)
(*2)
(*2)
(*1) Vehicle CAN Circuit
(*2) CAN1 Circuit (*1)
(*1)
(*2)
(*2) DI±996
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1190 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±997
1191 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check the DTC of the VSC (See page DI±911).
CHECK:
Check skid control ECU DTC.
RESULT:
DTC is not outputA
DTC (C1203 / 53) is outputB
B Repair circuit indicated by output code
(See page DI±921).
A
2 Check for open and short circuit in harness and connector between skid control
ECU and translate ECU (CAN1 circuit).
NG Repair or replace harness or connector
(CAN1 circuit).
OK
Replace translate ECU.

DI±998
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1192 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 53 Malfunction in CAN1 Communication
CIRCUIT DESCRIPTION
The circuit is used to send TRAC&VSC control information from the skid control ECU to the ECM, and engine
control information from the ECM to the skid control ECU via the CAN communication system.
This DTC is output when communication between the translate ECU and the skid control ECU is cut off.
DTC No.DTC Detecting ConditionTrouble Area
53
IG1 voltage is 8.5 V or more, and the condition that data
from skid control ECU cannot be received continues for 5
sec. or more.
VSC+, VSC± circuit (CAN1 communication system)

Skid control ECU

Translate ECU
DIDMH±01

F19196
E5
ECM
CANL
CANH34
33W
L2
J53
1
J532
J55
1
J55 J/C
W
R16
T5
14
T5ENG±
ENG+
VSC+
VSC± 7
T5
11
T5 L
W WL7
IL2
6
IL2 26 S1 ABS & VSC Actuator
(Skid Control ECU)Translate
ECU
IG1 1
T5 B±R
J37 J37J/C Sub J/B No.3
8
3C 8
3AB±R
B±R
B±Y
W±L I18
Ignition SW
WInstrument Panel J/B
4
1F
1
1L4
1C
6
1C ECU±IG
AM1
AM1 IG1
ALT
BatteryGND 40
T5 J43
J/C
O
A A O
IG1
2 CANH
CANL
A
A
8
5
BF10
Fusible Link
Block
(*1)
(*1)
(*2)
(*2)
(*1) Vehicle CAN Circuit
(*2) CAN1 Circuit (*1)
(*1)
(*2)
(*2)
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±999
1193 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

F19152
Translate ECU
GND
DI±1000
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1194 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check the DTC of the VSC (See page DI±911).
CHECK:
Check skid control ECU DTC.
RESULT:
DTC is not outputA
DTC (C1203/53) is outputB
B Repair circuit indicated by the output code
(See page DI±921).
A
2 Check for open circuit in harness and connector between GND terminal of the
translate ECU and body ground.
PREPARATION:
Disconnect the translate ECU connector.
CHECK:
Measure the resistance between the GND terminal and body
ground.
OK:
Continuity
NG Repair or replace harness or connector (Trans-
late ECU GND circuit).
OK

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1001
1195 Author: Date:
2005 SEQUOIA (RM1146U)
3 Replace the translate ECU and check if the trouble occurs again.
PREPARATION:
(a) Clear the translate DTC (See page DI±911).
(b) Turn the ignition switch OFF.
CHECK:
Turn the ignition switch to the ON position, and check if the same DTC is stored in the memory.
PREPARATION:
DTC 53 is not outputA
DTC 53 is outputB
B Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform zero point
calibration (See page DI±897).
A
END