Nissan Rogue. Manual — part 832
LAN
SYSTEM
LAN-27
< SYSTEM DESCRIPTION >
[CAN]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
• 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.
• 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)
JSMIA0450GB
JSMIA0543GB
JSMIA0544ZZ
JSMIA0545ZZ
LAN-28
< SYSTEM DESCRIPTION >
[CAN]
SYSTEM
CAN Communication Line
The CAN communication line is a twisted pair wire consisting of
strands of CAN-H and CAN-L and has noise immunity.
NOTE:
The CAN communication system has the characteristics of noise-resistant because this system produces dig-
ital signals by using the potential difference between the CAN-H line and the CAN-L line and has the twisted
pair wire structure.
Since the CAN-H line and the CAN-L line are always adjacent to
each other, the same degree of noise occurs, respectively, when a
noise occurs. Although the noise changes the voltage, the poten-
tial difference between the CAN-H line and the CAN-L line is
insensitive to noise. Therefore, noise-resistant signals can be
obtained.
CAN Signal Communications
Each control unit of the CAN communication system transmits signals through the CAN communication con-
trol circuit included in the control unit and receives only necessary signals from each control unit to perform
various kinds of control.
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
unit.
7
End of frame (7 bit)
End of message.
JSMIA0382ZZ
JSMIA0383ZZ
LAN
SYSTEM
LAN-29
< SYSTEM DESCRIPTION >
[CAN]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
• Example: Transmitted signals
• Example: Received signals
NOTE:
The above signal names and signal communications are provided for reference purposes. For CAN communi-
cations signals of this vehicle, refer to
LAN-32, "CAN COMMUNICATION SYSTEM : CAN Communication
.
JSMIA0576GB
JSMIA0577GB
LAN-30
< SYSTEM DESCRIPTION >
[CAN]
SYSTEM
CAN COMMUNICATION SYSTEM : CAN Communication Control Circuit
INFOID:0000000011277518
CAN communication control circuit is incorporated into the control unit and transmits/receives CAN communi-
cation signals.
*: These are the only control units wired with both ends of CAN communication system.
CAN COMMUNICATION SYSTEM : CAN System Specification Chart
INFOID:0000000011277519
Determine CAN system type from the following specification chart.
NOTE:
LAN-17, "Trouble Diagnosis Flow Chart"
for how to use CAN system specification chart.
JSMIA0453GB
Component
System description
CAN controller
It controls CAN communication signal transmission and reception, error detection, etc.
Transceiver IC
It converts digital signal into CAN communication signal, and CAN communication signal into digital
signal.
Noise filter
It eliminates noise of CAN communication signal.
Termination circuit
*
(Resistance of approx. 120
Ω)
Generates a potential difference between CAN-H and CAN-L.
Body type
Wagon
Axle
2WD
AWD
Engine
QR25DE
Transmission
CVT
Brake control
VDC
Around view monitor system
×
×
×
×
Automatic back door system
×
×
×
×
×
×
Forward Collision Warning
×
×
CAN system type
1
2
3
4
5
6
7
8
CAN communication unit
ECM
×
×
×
×
×
×
×
×
ABS actuator and electric unit (control unit)
×
×
×
×
×
×
×
×
IPDM E/R
×
×
×
×
×
×
×
×
TCM
×
×
×
×
×
×
×
×
Data link connector
×
×
×
×
×
×
×
×
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст