Toyota Sequoia (2005). Manual — part 317
DIDHZ–01
F19815
: CAN Main Bus Line
(CAN–H)
DLC3
120
Ω
±
10%
Suspension
Control ECU
ECM
: CAN Main Bus Line
(CAN–L)
: CAN Sub Bus Line
(CAN–H)
: CAN Sub Bus Line
(CAN–L)
120
Ω
±
10%
Serial Communication Line
Translate ECU
*1: w/ Air Suspension System
*1
*1
Junction
Connector
–
DIAGNOSTICS
CAN COMMUNICATION SYSTEM
DI–1063
1257
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
–
DIAGNOSTICS
CAN COMMUNICATION SYSTEM
1258
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
Ω
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
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 ”TERMINALS OF ECU” (see page
) for bus line colors.
DIDI1–01
END
P.
,
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
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 ”BUS CHECK” (see page
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.
P.
Communication Stop Mode Table
A
B
C
Identification of
Problem
Repair or Replace
END
Confirmation Test
,
Circuit Inspection
Identification of
Problem
OK
NG
,
Circuit Inspection
Repair or Replace
–
DIAGNOSTICS
CAN COMMUNICATION SYSTEM
DI–1065
1259
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.
DIDI2–01
Inspector’s
Name
:
Customer’s Name
Odometer Reading
/ /
/ /
Frequency Problem Occurs
/ /
Continuous
Intermittent ( times a day)
km
miles
CAN Communication System Check Sheet
Production Date
VIN
Licence Plate No.
DTC Check
1st Time
2nd Time
Normal System Code
Trouble Code (Code )
Normal System Code
Trouble Code (Code )
DI–1066
–
DIAGNOSTICS
CAN COMMUNICATION SYSTEM
1260
CUSTOMER PROBLEM ANALYSIS CHECK
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст