2001 TOYOTA SEQUOIA ECU

DIDHY±01
F19696
Junction Connector
Suspension
Control ECU
Translate ECU ECM
DLC3
DI±1062
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1256 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION

DIDHZ±01
F19815
: CAN Main Bus Line
(CAN±H) DLC3
120 W
± 10%
Suspension
Control ECU ECM
: CAN Main Bus Line
(CAN±L)
: CAN Sub Bus Line
(CAN±H) : CAN Sub Bus Line
(CAN±L)120 W
± 10% Serial Communication Line
Translate ECU
*1: w/ Air Suspension System*1 *1Junction
Connector
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1063
1257 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM
HINT:

The ECM uses the CAN communication system to perform DTC communication instead of the conven-
tional serial communication line (SIL).

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.

DIDI0±01
DI±1064
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1258 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. BRIEF DESCRIPTION
(a) The CAN (Controller Area Network) is a serial data communication system for real time application.
It is an in±vehicle multiplex communication system that has a high communication speed (500 kbps)
and the function to detect malfunctions.
(b) By pairing the CANH and CANL bus lines, the CAN performs communication based on differential volt-
age.
(c) Many ECUs (sensors) installed in the vehicle operate by sharing information and communicating with
each other.
(d) The CAN has two resistors of 120 W which are necessary to communicate with the main bus line.
2. DEFINITION OF TERMS
(a) Main bus line
(1) The main bus line is a wire harness between the two terminus circuits on the bus (communication
line). This is the main bus in the CAN communication system.
(b) Sub bus line
(1) The sub bus line is a wire harness that diverges from the main bus line to the ECU.
3. ECUs THAT COMMUNICATE THROUGH CAN COMMUNICATION SYSTEM
(a) Translate ECU
(b) Suspension Control ECU
(c) ECM
4. DIAGNOSTIC CODE FOR CAN COMMUNICATION SYSTEM
DTCs for the CAN communication system are as follows:
U0100/65, U0122/67, U0132/72, 65, 94.
HINT:
If C1201/51, C1202/52 or C1203/53 is output from skid control ECU, perform troubleshooting of each diag-
nosis code (see page DI±921).
5. REMARK FOR TROUBLESHOOTING
(a) Trouble in the CAN bus (communication line) can be checked from the DLC3 (except when there is
a wire break in lines other than the sub bus line of the DLC3).
NOTICE:
Do not insert the tester directly into the DLC3 connector. Be sure to use a service wire.
(b) The CAN communication system cannot detect trouble in the sub bus line of the DLC3 even though
the DLC3 is also connected to the CAN communication system.
6. HOW TO DISTINGUISH THE CAN J/C CONNECTOR
In the CAN communication system, all connectors connected to the CAN J/C are the same shape. The con-
nectors connected to the CAN J/C can be distinguished by the colors of the bus lines.
HINT:
See ºTERMINALS OF ECUº (see page DI±1068) for bus line colors.

DIDI1±01
END
P. DI±911, DI±723
Confirmation Test
Items inside are titles of pages in this manual,
with the page number in the bottom portion. See the
pages listed for detailed explanations.
DTC Combination Table
Vehicle Brought to Workshop
Check and Clear DTCs
P. DI±1067
All ECUs connected to the CAN communication system are displayed
An ECU not connected to the CAN communication system is displayed
A few ECUs not connected to the CAN communication system are displayed Check Using Hand±held Tester via CAN VIM
Select ºBUS CHECKº (see page DI±1073)
P. DI±1076
Check CAN Bus Line
Result Perform troubleshooting in accordance with the procedures on the following page.
A
B
C
Check for an open in one side of the CAN sub±bus line
P. DI±1114 P. DI±1067 Communication Stop Mode TableABC
Identification of
Problem
Repair or Replace
ENDConfirmation Test
P. DI±1086, DI±1092,
DI±1100, DI±1107 Circuit Inspection
Identification of
Problem
OKNG
P. DI±1079, DI±1081,
DI±1083Circuit Inspection
Repair or Replace
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1065
1259 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING
NOTICE:

DTCs for the CAN communication system are as follows:
U0100/65, U0122/67, U0132/72, 65, 94.

Refer to troubleshooting of each system if DTCs regarding the CAN communication system are
not output.

DIDI3±01
DTCTrouble Mode
Output fromOutput DTCECM
Communication
Stop ModeTranslate ECU
Communication
Stop ModeSuspension Control
ECU Communication
Stop Mode (*1)
Skid Control
ECU
Translate ECU
Suspension
Control
ECU (*1)
See pageU0100/65
65
94
U0100/65
U0122/67
U0132/71
±
±±± 


±
±


 
DI±1079
DI±1081 DI±1083 
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1067
1261 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
1. COMMUNICATION STOP MODE TABLE
(a) Complete ºCheck CAN Bus Lineº (see page DI±1076) to confirm that there is no malfunction in the CAN
bus line. Select ºBUS CHECKº on the hand±held tester via the CAN VIM (see page DI±1073).
(b) Check the communication stop mode of the ECUs not displayed among the following: ºENGINEº,
ºTRANSLATE ECUº, or ºREAR AIRSUSº.
SymptomInspection ItemSee page
ºENGINEº is not displayed on the hand±held tester via CAN VIM.ECM Communication Stop ModeDI±1079
ºTRANSLATE ECUº is not displayed on the hand±held tester via
CAN VIM.Translate ECU Communication Stop ModeDI±1081
ºREAR AIRSUSº is not displayed on the hand±held tester via
CAN VIM. (*1)Suspension Control ECU Communication Stop ModeDI±1083
HINT:
*1: w/ Air Suspension System
2. DTC COMBINATION TABLE
(a) Perform troubleshooting according to the combination of DTCs output.
HINT:

*1: w/ Air Suspension System

: DTCs that are being output.

±: DTCs that are not being output.

Previous CAN communication system DTCs may be the cause if CAN communication system DTCs
are output and all ECUs connected to the CAN communication system are displayed on the hand±held
tester 's ºBUS CHECKº screen via the CAN VIM.

DIDI4±01
F19816
Junction Connector ºBº Side
(w/o Earth Terminal):Junction Connector ºAº Side
(w/ Earth Terminal):
Earth Terminal
Junction
ConnectorJ53
J54
J55
G
W L
W
B
W R W
J56 (*1) DI±1068
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1262 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
HINT:
This section describes the standard CAN values for all CAN re-
lated components.
1. Junction Connector
HINT:

The connectors connected to the junction connector can
be distinguished by the colors of the bus lines and the
connecting side of the connector.

J53, J54, J55 and J56 are interchangeable.

*1: w/ Air Suspension System
CAN J/C connectors
(A side, w/ earth terminal)Color (CAN±H Side)Color (CAN±L Side)
ECM (J53)LW
DLC3 (J54)BW
Translate ECU (J55)RW
Suspension Control ECU (J56) *1GW

F16975
Translate ECU:
T5 ENG+
ENG±
12345678
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

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