TOYOTA SEQUOIA 2001 Service Repair Manual

F19735
CAN J/C Connector Front View:
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9 10111213141516
F19737
DLC3:
D6
CANH
CG
BAT
CANL
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1069
1263 Author: Date:
2005 SEQUOIA (RM1146U)
2. The Terminals of Connectors for the Junction Con-
nector
TerminalTerminal symbol
1CANH
2CANL
3. DLC3
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
TerminalsWiring ColorConditionSpecified Value
D6±6 (CANH) ± D6±14 (CANL)B ± WIgnition Switch OFF54 to 69 W
D6±6 (CANH) ± D6±4 (CG)B ± OIgnition Switch OFF3 kW or more
D6±14 (CANL) ± D6±4 (CG)W ± OIgnition Switch OFF3 kW or more
D6±6 (CANH) ± D6±16 (BAT)B ± W±RIgnition Switch OFF1 MW or more
D6±14 (CANL) ± D6±16 (BAT)W ± W±RIgnition Switch OFF1 MW or more

F16975
Translate ECU:
T5 ENG+
ENG±
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9 10111213141516
F19737F19152F19830
Translate ECU Wire Harness View:
T5
GND
ENG±
ENG+
DLC3:
D6
BAT
DI±1070
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1264 Author: Date:
2005 SEQUOIA (RM1146U)
4. Translate ECU
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
TerminalsConditionSpecified Value
T5±14 (ENG+) ± T5±16 (ENG±)Ignition Switch OFF108 to 132 W
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
TerminalsWiring ColorConditionSpecified Value
T5±14 (ENG+) ± T5±16 (ENG±)R ± WIgnition Switch OFF108 to 132 W
T5±14 (ENG+) ± T5±40 (GND)R ± OIgnition Switch OFF3 kW or more
T5±16 (ENG±) ± T5±40 (GND)W ± OIgnition Switch OFF3 kW or more
T5±14 (ENG+) ± D6±16 (BAT)R ± W±RIgnition Switch OFF1 MW or more
T5±16 (ENG±) ± D6±16 (BAT)W ± W±RIgnition Switch OFF1 MW or more

B17410
ECM:
CANL CANHE5
F19578
ECM Wire Harness View:
E4
E5
E8
BATT
E0ICANLCANH
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1071
1265 Author: Date:
2005 SEQUOIA (RM1146U)
5. ECM
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
TerminalsConditionSpecified Value
E5±33 (CANH) ± E5±34 (CANL)Ignition Switch OFF108 to 132 W
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
TerminalsWiring ColorConditionSpecified Value
E5±33 (CANH) ± E5±34 (CANL)L ± WIgnition Switch OFF108 to 132 W
E5±33 (CANH) ± E8±7 (E0I)L ± W±BIgnition Switch OFF3 kW or more
E5±34 (CANL) ± E8±7 (E0I)W ± W±BIgnition Switch OFF3 kW or more
E5±33 (CANH) ± E4±3 (BATT)L ± B±YIgnition Switch OFF1 MW or more
E5±34 (CANL) ± E4±3 (BATT)W ± B±YIgnition Switch OFF1 MW or more

F16805
Suspension Control ECU
Wire Harness View:
S25 GND BAT
CANH
CANL
DI±1072
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1266 Author: Date:
2005 SEQUOIA (RM1146U)
6. Suspension Control ECU
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
TerminalsWiring ColorConditionSpecified Value
S25±29 (CANH) ± S25±28 (CANL)G ± WIgnition Switch OFF54 to 69 W
S25±29 (CANH) ± S25±22 (GND)G ± W±BIgnition Switch OFF3 kW or more
S25±28 (CANL) ± S25±22 (GND)W ± W±BIgnition Switch OFF3 kW or more
S25±29 (CANH) ± S25±25 (BAT)G ± VIgnition Switch OFF1 MW or more
S25±28 (CANL) ± S25±25 (BAT)W ± VIgnition Switch OFF1 MW or more

DIDI5±01
F19740
F19741
F19742
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1073
1267 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. BUS CHECK
HINT:
The ECUs that are properly connected to the CAN communica-
tion system can be displayed using the hand±held tester via
CAN VIM.
(a) Select ºBUS CHECKº from the ºOBD/MOBD MENUº
screen.
(b) Press ºENTERº on the hand±held tester via CAN VIM.
(c) The screen displays the ECUs and sensors that are prop-
erly connected to the CAN communication system.
HINT:
There is a communication stop in the system of any properly
connected ECUs or sensors that are not displayed
(see page DI±1067).

DIDI6±01
Action when unable to communicateDTC detection
(Driver detectable)
Suspension
Control ECUVSC/TRC function stops
[When unable to communicate with ECM]
Function stops (Vehicle height cannot be changed until the ignition
switch is turned off)
[When unable to communicate with Translate ECU]
Vehicle height is maintained at the normal level until the ignition
switch is turned off. If communication is still impossible even after
the ignition switch is turned on again, the same height is maintained.Not detectable
( )
Not detectable
(VSC warning lamp
comes on)
Detectable
(Only DTCs are stored) ECMTranslate ECU
Suspension Control ECU
Rx
TxTx
Rx
Tx TxTx
Rx

ECM
Translate ECU DI±1074
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1268 Author: Date:
2005 SEQUOIA (RM1146U)
FAIL±SAFE CHART
1. FAIL±SAFE FUNCTION
(a) When communication fails in any of the CAN bus lines (communication lines) due to a short circuit or
any other cause, the fail±safe function, which is specified for each system, operates to prevent the
system from malfunctioning.
(b) Effects on each system when communication is impossible are as follows.
HINT:

Rx: Reception from each ECU.

Tx: Transmission to each ECU.

DIDI7±01
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1075
1269 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
1. DTC TABLE BY ECU
HINT:

If CAN communication system DTCs are output, trouble cannot be determined only by the DTCs. Per-
form troubleshooting according to ºHOW TO PROCEED WITH TROUBLESHOOTINGº (see page
DI±1065).
(a) Skid Control ECU
HINT:

DTC communication uses the SIL line.

If C1201/51, C1202/52 or C1203/53 is output from skid control ECU, perform troubleshooting of each
diagnosis code (see page DI±921).
DTC No.Detection Item
U0100/65Lost Communication With ECM/PCM ºAº
(b) ECM
HINT:
The ECM is connected to the CAN communication system, but CAN communication system DTCs are not
output.
(c) Translate ECU
HINT:
The translate ECU outputs DTCs only via the BRAKE warning light. Therefore, the DTCs cannot be checked
on the hand±held tester display via the CAN VIM.
DTC No.Detection Item
65Abnormalities in EFI communication
94Abnormalities in CAN communication
(d) Suspension Control ECU
HINT:
DTC communication uses the SIL line.
DTC No.Detection Item
U0100/65Lost Communication With ECM/PCM ºAº
U0122/67Lost Communication With Vehicle Dynamics Control Module
U0132/74Lost Communication With Ride Level Control Module

DIDI8±01
F19697
Translate ECU
Junction ConnectorECM
ENG+
ENG±14
T5
16
T51
J55
2
J55 R
W1
J53
2
J5333
E5
34
E5 W L CANH
CANL
Suspension Control ECU
CANH
CANL29
S25
28
S25G
W (*1)
(*1)1
J56
2
J561
J54
2
J54W B
6
14D6 DLC3
CANH
CANL
Instrument Panel J/B
BAT
CG W±R 13
1F 1
1L W W
8
5
B16
4 O
A
A
OJ43
J/C
IG ALT F10
FL Block
Battery
*1: w/ Air Suspension SystemOBD
12 DI±1076
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1270 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
Check CAN Bus Line
CIRCUIT DESCRIPTION
When any DTC of the CAN communication system is output, first measure the resistance between the termi-
nals of the DLC3 and the suspension control ECU connector to specify the trouble area.
WIRING DIAGRAM

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9 10111213141516
F19737
DLC3:
CANH
CANLD6
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1077
1271 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check CAN bus line (Main bus line for disconnection, bus lines for short circuit).
PREPARATION:
Turn the ignition switch to the LOCK position.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester
connec-
tion
ConditionSpecified
valueResult
D6±6
(CANH) ±
D6±14
(CANL)
Ignition Switch OFF54 to 69
WOK
D6±6
(CANH) ±
D6±14
(CANL)
Ignition Switch OFF69 W or
moreNG±A
D6±6
(CANH) ±
D6±14
(CANL)
Ignition Switch OFF54 W or
lessNG±B
NG±A Check CAN main bus line for disconnection
(See page DI±1086).
NG±B Check CAN bus lines for short circuit
(See page DI±1092).
OK

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9 10111213141516
F19737
DLC3:
CANH
CANLD6
BAT
12345678
9 10111213141516
F19737
DLC3:
CANH
CANLD6
CG
DI±1078
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1272 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check CAN bus line for short to +B.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified value
D6±6 (CANH) ±
D6±16 (BAT)Ignition Switch OFF1 MW or more
D6±14 (CANL) ±
D6±16 (BAT)Ignition Switch OFF1 MW or more
NG Check CAN bus line for short to +B
(See page DI±1107).
OK
3 Check CAN bus line for short to GND.
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 more
D6±4 (CG) ±
D6±14 (CANL)Ignition Switch OFF3 kW or more
NG Check CAN bus line for short to GND
(See page DI±1100).
OK
Go to ºHow to proceed with troubleshootingº
(See page DI±1065).