TOYOTA SEQUOIA 2001 Service Repair Manual

12345678
9 10111213141516
F19737
DLC3:
D6CANH
CANL
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1099
1293 Author: Date:
2005 SEQUOIA (RM1146U)
13 Check CAN bus lines for short circuit (Suspension control ECU sub bus line).
PREPARATION:
Disconnect the suspension control ECU connector (S25).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
D6±6 (CANH) ±
D6±14 (CANL)Ignition Switch OFF54 to 69 W
OK Replace suspension control ECU
(See page SA±171).
NG
Repair or replace suspension control ECU
sub bus line or connector (CAN±H, CAN±L).

F19703
Translate ECU
ENG+
ENG±
GND14
T5
16
T5
40
T5WR
O1
J55
2
J55Junction Connector
1
J53
2
J53WL
W±B33
E5
34
E5
7
E8ECM
CANH
CANL
E01
Suspension
Control ECU
1
J56
2
J56WG
W±B29
S25
28
22CANH
CANL
GND S25
S25 W±B(*1)
(*1)
A
J12
J/C
IF EB D6
DLC3
1
J54
2
J54 B
W
O
O
O 6
14
4
A
A
AJ43
J/C
IG CANH
CANL
CG
*1: w/ Air Suspension System DI±1100
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1294 Author: Date:
2005 SEQUOIA (RM1146U)
Check CAN Bus Line For Short To GND
CIRCUIT DESCRIPTION
A short to GND is suspected in the CAN bus line when there is continuity between terminals 4 (CG) and 6
(CANH) or terminals 4 (CG) and 14 (CANL) of the DLC3.
SymptomTrouble Area
There is continuity between terminals 4 (CG) and 6 (CANH)
or terminals 4 (CG) and 14 (CANL) of the DLC3.

Short to GND in CAN bus line

ECM

Translate ECU

Suspension control ECU
WIRING DIAGRAM
DIDIE±01

F19749
Junction Connector ºAº Side
(w/ Earth Terminal)
Wire Harness View:
J54
W B
Earth Terminal
12345678
9 10111213141516
F19737
DLC3:
D6CANH
CANLCG
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1101
1295 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check CAN bus line for short to GND (DLC3 sub bus line).
PREPARATION:
Disconnect the DLC3 sub bus line connector (J54) from the
junction connector.
NOTICE:

Before disconnecting the connector, make a note of
where it is connected.

Reconnect the connector to its original position.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
D6±4 (CG) ±
D6±6 (CANH)Ignition Switch OFF1 MW or higher
D6±4 (CG) ±
D6±14 (CANL)Ignition Switch OFF1 MW or higher
NG Repair or replace DLC3 sub bus line or connec-
tor (CAN±H, CAN±L).
OK
2 Connect the connector.
Reconnect the DLC3 sub bus line connector (J54) to the junction connector.
NEXT

F19749
Junction Connector ºAº Side
(w/ Earth Terminal)
Wire Harness View:
J53
W L
Earth Terminal
12345678
9 10111213141516
F19737
DLC3:
D6CANH
CANLCG
DI±1102
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1296 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check CAN bus line for short to GND (ECM main bus line).
PREPARATION:
Disconnect the ECM main bus line connector (J53) from the
junction connector.
NOTICE:

Before disconnecting the connector, make a note of
where it is connected.

Reconnect the connector to its original position.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
D6±4 (CG) ±
D6±6 (CANH)Ignition Switch OFF3 kW or higher
D6±4 (CG) ±
D6±14 (CANL)Ignition Switch OFF3 kW or higher
OK Go to step 8.
NG
4 Connect the connector.
Reconnect the ECM main bus line connector (J53) to the junction connector.
NEXT

F19749
Junction Connector ºAº Side
(w/ Earth Terminal)
Wire Harness View:
J55
W R
Earth Terminal
12345678
9 10111213141516
F19737
DLC3:
D6CANH
CANLCG
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1103
1297 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check CAN bus line for short to GND (Translate ECU main bus line).
HINT:
For vehicles without an enhanced air suspension system, go to
step 11.
PREPARATION:
Disconnect the translate ECU main bus line connector (J55)
from the junction connector.
NOTICE:

Before disconnecting the connector, make a note of
where it is connected.

Reconnect the connector to its original position.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
D6±4 (CG) ±
D6±6 (CANH)Ignition Switch OFF3 kW or higher
D6±4 (CG) ±
D6±14 (CANL)Ignition Switch OFF3 kW or higher
OK Go to step 10.
NG
6 Connect the connector.
Reconnect the translate ECU main bus line connector (J55) to the junction connector.
NEXT

12345678
9 10111213141516
F19737
DLC3:
D6CANH
CANLCG
DI±1104
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1298 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check CAN bus line for short to GND (Suspension control ECU sub bus line).
PREPARATION:
Disconnect the suspension control ECU connector (S25).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
D6±4 (CG) ±
D6±6 (CANH)Ignition Switch OFF3 kW or higher
D6±4 (CG) ±
D6±14 (CANL)Ignition Switch OFF3 kW or higher
OK Replace suspension control ECU.
(See page SA±171)
NG
Repair or replace suspension control ECU
sub bus line or connector (CAN±H, CAN±L).
8 Connect the connector.
Reconnect the ECM main bus line connector (J53) to the junction connector.
NEXT

12345678
9 10111213141516
F19737
DLC3:
D6CANH
CANLCG
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1105
1299 Author: Date:
2005 SEQUOIA (RM1146U)
9 Check CAN bus line for short to GND (ECM main bus line).
PREPARATION:
Disconnect the ECM connector (E5).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
D6±4 (CG) ±
D6±6 (CANH)Ignition Switch OFF3 kW or higher
D6±4 (CG) ±
D6±14 (CANL)Ignition Switch OFF3 kW or higher
OK Replace ECM (See page SF±80).
NG
Repair or replace ECM main bus line or con-
nector (CAN±H, CAN±L).
10 Connect the connector.
Reconnect the translate ECU main bus line connector (J55) to the junction connector.
NEXT

12345678
9 10111213141516
F19737
DLC3:
D6CANH
CANLCG
DI±1106
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1300 Author: Date:
2005 SEQUOIA (RM1146U)
11 Check CAN bus line for short to GND (Translate ECU main bus line).
PREPARATION:
Disconnect the translate ECU connector (T5).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
D6±4 (CG) ±
D6±6 (CANH)Ignition Switch OFF3 kW or higher
D6±4 (CG) ±
D6±14 (CANL)Ignition Switch OFF3 kW or higher
OK Replace translate ECU.
NG
Repair or replace translate ECU main bus line
or connector (CAN±H, CAN±L).

F19704
Translate ECU
ENG+
ENG±14
T5
16
T5R
W1
J55
2
J551
J53
2
J53 Junction Connector
L
W33
E5
34
E5
3
E4ECM
CANH
CANL
BATT B±Y
11
IA4
D6 DLC3
6
14CANH
CANL
BAT B
W 1
J54
2
J54 1
J56
2
J56 Suspension Control ECU
G
W (*1)
(*1) 29
S25
28
S25
25
S25 CANH
CANL
BATVB
J37C
J38VV 5
IA5B±Y
V
V Engine Room J/B & R/B No.2
EF1 No.1
AIR SUS No.27
2H
2
2 1
2D B
W W
WB
W 49
8
AIR
SUSALT
5
B
F10
FL
Block
Battery1
1L13
1F
1
2 OBD Instrument Panel J/B
W±R
16
*1: w/ Air Suspension System12 J/C
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1107
1301 Author: Date:
2005 SEQUOIA (RM1146U)
Check CAN Bus Line For Short To + B
CIRCUIT DESCRIPTION
A short to +B is suspected in the CAN bus line when there is continuity between terminals 16 (BAT) and 6
(CANH) or terminals 16 (BAT) and 14 (CANL) of the DLC3.
SymptomTrouble Area
There is continuity between terminals 16 (BAT) and 6
(CANH) or 16 (BAT) and 14 (CANL) of the DLC3.

Short to +B in CAN bus line

ECM

Translate ECU

Suspension control ECU
WIRING DIAGRAM
DIDIF±01

F19749
Junction Connector ºAº Side
(w/ Earth Terminal) Wire Harness View:
J54
W B
Earth Terminal
12345678
9 10111213141516
F19737
DLC3:
D6CANH
CANL
BAT
DI±1108
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1302 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check CAN bus line for short to +B (DLC3 sub bus line).
PREPARATION:
Disconnect the DLC3 sub bus line connector (J54) from the
junction connector.
NOTICE:

Before disconnecting the connector, make a note of
where it is connected.

Reconnect the connector to its original position.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
D6±16 (BAT) ±
D6±6 (CANH)Ignition Switch OFF1 MW or higher
D6±16 (BAT) ±
D6±14 (CANL)Ignition Switch OFF1 MW or higher
NG Repair or replace DLC3 sub bus line or connec-
tor (CAN±H, CAN±L).
OK
2 Connect the connector.
Reconnect the DLC3 sub bus line connector (J54) to the junction connector.
NEXT