TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1009
1203 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 94 Malfunction 2 of Vehicle CAN
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 CAN communication system.
This DTC is output when the ECM and translate ECU cannot communicate with each other.
DTC No.DTC Detecting ConditionTrouble Area
94
When each of the following 1 or 2 is detected at IG1 voltage
of 8.5 V or more.
1. Communication error because of noise.
2. Data sending error after writing to output device for 5
sec. or more.
ENG+, ENG± circuit (CAN communication system)

ECM

Translate ECU

Suspension control ECU
DIDMK±01

F19799
S25
Suspension Control ECU
CANL
CANH34
33W
L2
J53
12
J55
1
J55W
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
AA
8
5
BF10
Fusible Link
Block
J53J56 J5612 W
G 28
29 CANL
CANH
E5
ECM
(*1) Vehicle CAN Circuit
(*2) CAN1 Circuit (*1)
(*2)(*1)
(*1)
(*1)(*1)
(*1)
(*2)(*2)
(*2) DI±1010
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1204 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

F19152
Translate ECU
GND
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1011
1205 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check DTC of the VSC (See page DI±911)
CHECK:
Check skid control ECU DTC.
RESULT:
DTC is not outputA
DTC 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 (See page IN±35).
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

DI±1012
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1206 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 94 is not outputA
DTC 94 is outputB
B Check and repair suspension control ECU, ECM
or CAN communication system.
A
END

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1013
1207 Author: Date:
2005 SEQUOIA (RM1146U)
DTC Normal Code Malfunction in Translate ECU
CIRCUIT DESCRIPTION
If any trouble occurs in the engine control system, the skid control ECU prohibits ABS & VSC control.
DTC No.DTC Detecting ConditionTrouble Area
Normal Code
Conditions 1., 2. or 3. continue for 5 sec. or more:
1. Engine malfunction signal is sent from ECM.
2. Shift malfunction signal is sent from ECM.
3. The shift position is other than P and N, and P range
input voltage is 8 V or more.

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)
INSPECTION PROCEDURE
1 Is DTC output for ECM?
Check DTC on page DI±43.
YES Repair engine control system according to the
output code (See page DI±58).
NO
2 Check the DTC of the ABS and VSC (See page DI±911).
CHECK:
Check skid control ECU DTC.
RESULT:
Only DTC ºC1203/53º of the VSC system is outputA
Except DTC ºC1203/53º of the VSC system are outputB
B Repair ABS and VSC control system according
to the code output (See page DI±921).
A
DI6OF±12

DI±1014
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1208 Author: Date:
2005 SEQUOIA (RM1146U)
3 Replace the translate ECU and check if the trouble occurs again.
PREPARATION:
(a) Clear the 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 is not outputA
DTC 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

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1015
1209 Author: Date:
2005 SEQUOIA (RM1146U)
DTC Non ± Code Translate ECU malfunction
CIRCUIT DESCRIPTION
Translate ECU DTCs can be read by blinks of the brake warning light (see page DI±911).
DTC No.DTC Detecting ConditionTrouble Area
Non ± code*Translate ECU internal malfunction is detected.

Brake warning light circuit

Tc terminal circuit

Translate ECU
*: Neither the normal system code nor a trouble code is output.
INSPECTION PROCEDURE
1 Check the BRAKE warning light circuit (See page DI±1033).
OK:
BRAKE warning light circuit is normal.
NG Repair or replace the BRAKE warning light cir-
cuit.
OK
2 Check the Tc terminal circuit (See page DI±1055).
OK:
Tc terminal circuit is normal.
NG Repair or replace the Tc terminal circuit.
OK
Check and replace the translate ECU.
DI942±03

DI±1016
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1210 Author: Date:
2005 SEQUOIA (RM1146U)
DTC Always ON* Malfunction in Skid Control ECU
*: ABS warning light
When reading DTCs by SST (CHECK WIRE), if the ABS warning light remains ON, troubleshoot by following
the inspection flow.
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
Always ON
When any of the following conditions are detected:
1. Malfunction in ECU internal circuit is identified.
2. ECU power source voltage is too high.

Battery

Charging system

Power source circuit

ABS warning light circuit

Skid control ECU
HINT:
There is a possibility that the hand±held tester cannot be used when the ECU is abnormal.
DI943±03

F19777
ABS & VSC Actuator
(Skid Control ECU)
WA 35
S1 R±W IL2 4 R±W
21 C6
Combination Meter
Instrument Panel J/B
11
1HB±O
24
2 1CIGN1
B±R
I18
Ignition SW
IG2
AM2
IG1
AM13
1C
6
1C
4
1C7
1J
1
1L
4
1F AM1
ECU±IG1 2
2 6
5
1W±R
W±L
B±YW±R
WBB 1
2C1
2D
B±RSub J/B No.3
8
3A8
3CB±R
B±R
B±R B±R
W±B A
J37
A
J38 A
J371
IL113
S1
IG1 IG1
GND1
40O
O A
AA
AW±B
W±B
W±B J18
J/C J43
J/C17
IL1
9
IL11
S1
GND1
GND2 32
S1
IG IG W
B
B 5 8
4
ALTF10
Fusible
Link
Block
BatteryEngine Room J/B
AM2
J/C T5
Translate ECUABS
B±R
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1017
1211 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

F16990
ON
IG1
GND
DI±1018
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1212 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Is DTC output?
Check DTC on page DI±911.
YES Repair circuit indicated by the output code
(See page DI±921).
NO
2 Check that the skid control ECU connector is securely connected to the skid
control ECU (See page IN±35).
NG Connect the connector to the skid control ECU.
OK
3 Check voltage between terminals IG1 and GND of the skid control ECU connec-
tor.
PREPARATION:
Disconnect the skid control ECU connector.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage between terminals IG1 and GND of
the skid control ECU harness side connector.
OK:
Voltage: 10 to 14 V
NG Check for open and short circuit in harness and
connector between ECU±IG fuse and skid con-
trol ECU (See page IN±35).
OK