Nissan Rogue. Instruction — part 827
LAN
PRECAUTIONS
LAN-7
< PRECAUTION >
[CAN FUNDAMENTAL]
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PRECAUTION
PRECAUTIONS
Precautions for Trouble Diagnosis
INFOID:0000000011277496
CAUTION:
• Never apply 7.0 V or more to the measurement terminal.
• Use a tester with open terminal voltage of 7.0 V or less.
• Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when
checking the harness.
Precautions for Harness Repair
INFOID:0000000011277497
• Solder the repaired area and wrap tape around the soldered area.
NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).
• 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.
SKIB8766E
SKIB8767E
LAN-8
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
CAN COMMUNICATION SYSTEM
SYSTEM DESCRIPTION
CAN COMMUNICATION SYSTEM
System Description
INFOID:0000000011277498
• CAN communication is a multiplex communication system. This enables the system to transmit and receive
large quantities of data at high speed by connecting control units with two communication lines (CAN-H and
CAN-L).
• Control units on the CAN network transmit signals using the CAN communication control circuit. They
receive only necessary signals from other control units to operate various functions.
• CAN communication lines adopt twisted-pair line style (two lines twisted) for noise immunity.
System Diagram
INFOID:0000000011277499
Each control unit passes an electric current to the termination circuits when transmitting CAN communication
signal. The termination circuits produce an electrical potential difference between CAN-H and CAN-L. CAN
communication system transmits and receives CAN communication signals by the potential difference.
SKIB8887E
Component
Description
Main line
CAN communication line between splices
Branch line
CAN communication line between splice and a control unit
Splice
A point connecting a branch line with a main line
Termination circuit
LAN-9, "CAN Communication Control Circuit"
.
LAN
CAN COMMUNICATION SYSTEM
LAN-9
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
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CAN Communication Control Circuit
INFOID:0000000011277500
*: These are the only control units wired with both ends of CAN communication system.
SKIB8713E
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)
It produces potential difference.
LAN-10
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
DIAG ON CAN
DIAG ON CAN
Description
INFOID:0000000011277501
“Diag on CAN” is a diagnosis using CAN communication instead of previous DDL1 and DDL2 communication
lines, between control units and diagnosis unit.
System Diagram
INFOID:0000000011277502
SKIB8714E
Name
Harness
Description
DDL1
Tx
Rx
It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
DDL2
K-LINE
It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
Diag on CAN
CAN-H
CAN-L
It is used for trouble diagnosis and control.
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