Page 1281 of 4323
F19698
ECM
MREL 8
E4 B±W 14
IA4 B±W
B±R12
IA4B±R B±R
B±R J16
J/C
D
DD1
E4
2
E4+B
+B2 Engine Room J/B
EF1 Relay
2
2H
6
2H1
2D
1
2F 3
25
1B
W±B
W±B
W±B7
E8E01
EB
EDJ5
J/C A F10
FL Block
B
4
5 B
BatteryEF1 No.1
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1079
1273 Author: Date:
2005 SEQUOIA (RM1146U)
ECM Communication Stop Mode
MODE DESCRIPTION
Detection ItemSymptomTrouble Area
ECM Communica-
tion Stop Mode
ºENGINEº is not displayed on the ºBUS CHECKº screen
of the hand±held tester.
DTCs are output from each ECU in ECM communication
stop mode as shown in the ºDTC COMBINATION TABLEº
(see page DI±1067).
Power source or inside the ECM
WIRING DIAGRAM
DIDI9±01
Page 1282 of 4323
F19705E4+B2
E01E8 ECM Wire Harness View:
+B
DI±1080
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1274 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check wire harness (ECM ± Battery and ECM ± Body ground).
PREPARATION:
Disconnect the ECM connectors (E4) and (E8).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
E8±7 (E01) ±
Body groundAlwaysBelow 1 W
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester connectionConditionSpecified value
E4±1 (+B) ±
Body groundIgnition Switch ON10 to 14 V
E4±2 (+B2) ±
Body groundIgnition Switch ON10 to 14 V
NG Repair or replace wire harness or connector
(ECM ± Battery or ECM ± Body ground).
OK
Replace ECM (See page SF±80).
Page 1283 of 4323
F19699
Translate ECU
IG1 1
T5 B±R A
J37 J/B
A
J37 B±R Sub J/B No.3
8
3C 8
3A B±R
Instrument Panel J/B
ECU±IG
4
1C
6
1C 4
1F
1
1LAM1
2 1B±Y
2I18
Ignition SW
W±L
1
IG1AM1
W
8
5
BALTF10
FL Block
Battery40
T5 O
A
A
OJ43
J/C
IGGND
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1081
1275 Author: Date:
2005 SEQUOIA (RM1146U)
Translate ECU Communication Stop Mode
MODE DESCRIPTION
Detection ItemSymptomTrouble Area
Translate ECU
Communication
Stop Mode
ºTRANSLATE ECUº is not displayed on the ºBUS
CHECKº screen of the hand±held tester.
DTCs are output from each ECU in translate ECU com-
munication stop mode as shown in the ºDTC COMBINA-
TION TABLEº (see page DI±1067).
Power source or inside the translate ECU
WIRING DIAGRAM
DIDIA±01
Page 1284 of 4323
F19152
IG1
T5
Translate ECU Wire Harness View:
GND
DI±1082
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1276 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check wire harness (Translate ECU ± Battery and Translate ECU ± Body ground).
PREPARATION:
Disconnect the translate ECU connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
T5±40 (GND) ±
Body groundAlwaysBelow 1 W
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester connectionConditionSpecified value
T5±1 (IG1) ±
Body groundIgnition Switch ON10 to 14 V
NG Repair or replace wire harness or connector
(Translate ECU ± Battery or Translate ECU ±
Body ground).
OK
Replace translate ECU.
Page 1285 of 4323
F19706
Suspension
Control ECU
IG 10
S25 B±R
J37 J/C
J37 Sub J/B No.3
B±R 8
3C 8
3A B±R
Instrument Panel J/B
4
1F
1
1LECU±IG
AM14
1C
6
1CB±Y
2I18
Ignition SW
AM1
IG1W±L
W
8
ALT
5
B
BatteryF10
FL BlockGND 22
S25 W±B
A
J12
J/C
IF 121 AA
Translate ECU
ENG+
ENG±T5
T514
16ECM
CANH
CANL
Junction Connector
E5
E5 33
34 R
W
WL
J55
J55J53
J53 1
21
2 J56
J561
2
W G
CANH
CANL S25
S2529
28
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1083
1277 Author: Date:
2005 SEQUOIA (RM1146U)
Suspension Control ECU Communication Stop Mode
MODE DESCRIPTION
Detection ItemSymptomTrouble Area
Suspension Con-
trol ECU Commu-
nication Stop
ModeºRIAR AIRSUSº is not displayed on the ºBUS CHECKº
screen of the hand±held tester.
DTCs are output from each ECU in suspension control
ECU communication stop mode in the ºDTC COMBINA-
TION TABLEº (see page DI±1067).
Power source or inside the suspension control ECU
Suspension control ECU sub bus line
WIRING DIAGRAM
DIDIB±01
Page 1286 of 4323
F16805
IG
S25
Suspension Control ECU
Wire Harness View:
GND
DI±1084
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1278 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check wire harness (Suspension control ECU ± Battery and Suspension control
ECU ± Body ground).
PREPARATION:
Disconnect the suspension control ECU connector (S25).
CHECK:
(a) Measure the resistance according to the value(s) in the
table below.
OK:
Tester connectionConditionSpecified value
S25±22 (GND) ±
Body groundAlwaysBelow 1 W
(b) Measure the voltage according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
S25±10 (IG) ±
Body groundIgnition Switch ON10 to 14 V
NG Repair or replace harness or connector
(Suspension Control ECU ± Battery or Suspen-
sion Control ECU ± Body ground).
OK
Page 1287 of 4323
F16805
Suspension Control ECU
Wire Harness View:
CANH
CANLS25
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1085
1279 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check CAN bus line (Suspension control ECU sub bus line).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
S25±29 (CANH) ±
S25±28 (CANL)Ignition Switch OFF54 to 69 W
NG Repair or replace suspension control ECU sub
bus line or connector (CAN±H, CAN±L).
OK
Replace suspension control ECU
(See page SA±171).
Page 1288 of 4323
F19701
Translate ECU
ENG+
ENG±Junction Connector
14
T5
16
T5R
W1
J55
2
J551
J53
2
J53L
W33
E5
34
E5ECM
CANH
CANL
D6 DLC3
1
J54
2
J54B
W6
14CANH
CANL DI±1086
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1280 Author: Date:
2005 SEQUOIA (RM1146U)
Check CAN Main Bus Line For Disconnection
CIRCUIT DESCRIPTION
The CAN main bus line and DLC3 sub bus line may have a disconnection when the resistance between ter-
minals 6 (CANH) and 14 (CANL) of the DLC3 is more than 69 W.
SymptomTrouble Area
Resistance between terminals 6 (CANH) and 14 (CANL) of
the DLC3 is more than 69 W.
CAN main bus line
ECM
Translate ECU
DLC3 sub bus line
WIRING DIAGRAM
DIDIC±01