engine TOYOTA SEQUOIA 2001 Service Repair Manual

F19770
Translate ECU
VSC± VSC+
ENG±ENG+ABS & VSC Actuator
(Skid Control ECU)
7
T5
11
T5
14
T5
16
T57
IL2
6
IL2 L
WL
W6
S1
2
S1CANH
CANL
R
WL
W 1
J55
2
J551
J53
2
J53 J/C
33
E5
34
E5CANH
CANLECM (*1)
(*1)
(*2)
(*2)
(*1) CAN1 Circuit(*2) Vehicle CAN Circuit (*1)
(*1)
(*2)
(*2) DI±942
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1136 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1203 / 53 Malfunction in CAN1 Communication
CIRCUIT DESCRIPTION
This circuit is used to send TRAC & VSC control information from the skid control ECU to the ECM (CAN
communication system) and engine control information from the ECM to the skid control ECU (CAN commu-
nication system).
The skid control ECU and ECM are connected to each other via the translate ECU using the CAN commu-
nication system.
DTC No.DTC Detecting ConditionTrouble Area
C1203 / 53Data cannot be transmitted and/or received to/from ECM
from translate ECU for a fixed time.

Skid control ECU

CAN1 communication system

ECM

Translate ECU
WIRING DIAGRAM
DI93J±04

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±943
1137 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check engine control system.
CHECK:
Check engine control system (See page DI±43).
RESULT:
DTC is not outputA
DTC is outputB
B Repair engine control system according to the
output code (See page DI±58).
A
2 Check DTC of translate ECU.
CHECK:
Check DTC of the translate ECU (See page DI±911).
RESULT:
DTC is output (53, 65, 94)A
DTC is not outputB
B Go to step 4.
A
3 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

F19800
(1): Brake Pedal
Depressed
(2): Brake Pedal
Released Voltage
Time 4.5 V
1.9 V
0.5 V(2)
(1)
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±961
1155 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in the case of using the hand±held tester and start from step 2 in the case
of not using the hand±held tester.
1 Check output value of the delta S sensor (pedal stroke speed sensor) using the
hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Run the engine until the engine speed reaches 3,000 rpm, and return it back to idle.
HINT:
Rev up the engine to ensure sufficient vacuum.
(d) Select DATA LIST mode on the hand±held .
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
PEDAL STROKEPedal stroke sensor/
min.: 0 V, max.: 5.1 V
Approximately 2.0 V with-
out the brake pedal de-
pressed.
±
HINT:

The result appears on the tester after some delay because a time lag occurs in measurement with a
hand±held tester.

If a signal from the delta S sensor is sent between sampling, the result does not appear on the tester.
So be sure to perform the measurement 2 or 3 times.
CHECK:
Check that the brake pedal acceleration value of the delta S sensor displayed on the hand±held tester
changes, alternatively increasing the brake pedal stroke.
OK:
The value changes as shown in the illustration on the
left. (The value will return to approximately 2.0 V after
the brake pedal is released.)
HINT:
The maximum voltage depends on pedal stroke speed but
should not exceed 4.5 V or fall below 0.2 V.
OK Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform zero point
calibration (See page DI±897).
NG

F19775
TL1
TL2
TL325
F22
24
F22
23
F22B±W
B
B±RB±W
B
B±R W±B 6
IG1
9
IG1
2
IG1TL1
TL2
TL3 GND T4
Transfer Shift Actuator12
3
4
W±BW±B
W±R W
W±R W
A
J18
J/C 5
6
F10
Fusible Link Block
ALT
5
48
B BEngine Room J/B
1
2D1
2C AM2
IG Battery3
4
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±979
1173 Author: Date:
2005 SEQUOIA (RM1146U)

± 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

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

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1005
1199 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 65 Malfunction 1 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 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
65
Any of the following 1. through 3. is detected when IG1
voltage is 8.5 V or more and vehicle speed exceeds by 9
mph (15 km/h) or more.
1. Condition that signal cannot be received from ECM at
least once within 5 sec. occurs 10 times or more within
60 seconds.
2. Signal cannot be received continuously for 2 sec. or
more.
3. Condition that signal cannot be sent to ECM at least
once within 5 sec. occurs 10 times or more within 60
seconds.

ENG+, ENG± circuit (CAN communication system)

ECM

Translate ECU

Suspension control ECU
DIDMJ±01

± 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

± 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

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