2001 TOYOTA SEQUOIA Page 18

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

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).

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

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
Mode
ºRIAR 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

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).

B17418
ECM:
E5
CANL CANH
DI±1090
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1284 Author: Date:
2005 SEQUOIA (RM1146U)
6 Inspect ECM.
PREPARATION:
Disconnect the ECM connector (E5).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
33 (CANH) ± 34 (CANL)Ignition Switch OFF108 to 132 W
NG Replace ECM (See page SF±80).
OK
Repair or replace CAN main bus line or con-
nector (ECM ± junction connector).
7 Connect the connector.
Reconnect the translate ECU main bus line connector (J55) to the junction connector.
NEXT

12345678
9 10111213141516
F19737
DLC3:
D6CANH
CANL
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1097
1291 Author: Date:
2005 SEQUOIA (RM1146U)
9 Check CAN bus lines for short circuit (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±6 (CANH) ±
D6±14 (CANL)Ignition Switch OFF108 to 132 W
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
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).