Nissan Versa Sedan. Manual — part 536
LAN-22
< PRECAUTION >
[CAN]
PRECAUTIONS
• Bypass connection is never allowed at the repaired area.
NOTE:
Bypass connection may cause CAN communication error. The
spliced wire becomes separated and the characteristics of twisted
line are lost.
• Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communica-
tion line.
SKIB8767E
LAN
COMPONENT PARTS
LAN-23
< SYSTEM DESCRIPTION >
[CAN]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000009269350
1.
Combination meter
• M82: TYPE A
• M24: TYPE B
2.
AV control unit M70
3.
ABS actuator and electric unit (con-
trol unit) E33
4.
TCM
• F44: CVT models
• F57: A/T models
5.
ECM E16
6.
IPDM E/R E46
7.
EPS control unit M53
8.
BCM
• M97: Models with Intelligent Key
system
• M18: Models without Intelligent
Key system
9.
Data link connector M22
10. Steering angle sensor M64
11. Air bag diagnosis sensor unit M35
ALMIA0647ZZ
LAN-24
< SYSTEM DESCRIPTION >
[CAN]
SYSTEM
SYSTEM
CAN COMMUNICATION SYSTEM
CAN COMMUNICATION SYSTEM : System Description
INFOID:0000000009269351
SYSTEM DIAGRAM
DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN COMMUNICATION SIGNAL GENERATION
• Termination circuits (resistors) are connected across the CAN communication system. When transmitting a
CAN communication signal, each control unit passes a current to the CAN-H line and the current returns to
the CAN-L line.
JSMIA1470GB
JSMIA0450GB
LAN
SYSTEM
LAN-25
< SYSTEM DESCRIPTION >
[CAN]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
• The current flows separately into the termination circuits connected
across the CAN communication system and the termination cir-
cuits drop voltage to generate a potential difference between the
CAN-H line and the CAN-L line.
NOTE:
A signal with no current passage is called “Recessive” and one
with current passage is called “Dominant”.
• The system produces digital signals for signal communications, by
using the potential difference.
THE CONSTRUCTION OF CAN COMMUNICATION SIGNAL (MESSAGE)
CAN Communication Line
JSMIA0543GB
JSMIA0544ZZ
JSMIA0545ZZ
No.
Message name
Description
1
Start of frame (1 bit)
Start of message.
2
Arbitration of field (11 bit)
Priorities of message-sending are shown when there is a pos-
sibility that multiple messages are sent at the same time.
3
Control field (6 bit)
Signal quantity in data field is shown.
4
Data field (0-64 bit)
Actual signal is shown.
5
CRC field (16 bit)
• The transmitting control unit calculates sending data in ad-
vance and writes the calculated value in a message.
• The receiving control unit calculates received data and judg-
es that the data reception is normal when the calculated val-
ue is the same as the value written in the sent data.
6
ACK field (2 bit)
The completion of normal reception is sent to the transmitting
control unit.
7
End of frame (7 bit)
End of message.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст