Nissan Qashqai J11. Manual - part 1856

LAN

HOW TO USE THIS SECTION

LAN-17

< HOW TO USE THIS MANUAL >

[CAN FUNDAMENTAL]

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HOW TO USE THIS MANUAL

HOW TO USE THIS SECTION

Information

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• “CAN FUNDAMENTAL” of LAN Section describes the basic knowledge of the CAN communication system

and the method of trouble diagnosis.

• For information peculiar to a vehicle and inspection procedure, refer to “CAN”.

LAN-18

< PRECAUTION >

[CAN FUNDAMENTAL]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precautions for Trouble Diagnosis

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CAUTION:

Follow the instructions listed below. Failure to do this may cause damage to parts:
• 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

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• 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

SYSTEM

LAN-19

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

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SYSTEM DESCRIPTION

SYSTEM

CAN COMMUNICATION SYSTEM

CAN COMMUNICATION SYSTEM : System Description

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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.

DIAG ON CAN

DIAG ON CAN : System Description

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SYSTEM DIAGRAM

JSMIA0526GB

LAN-20

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

SYSTEM

DESCRIPTION

“Diag on CAN” is a diagnosis method which uses the CAN communication line for the communication between
the control unit and the diagnostic tool.

Name

Harness

Description

DDL1

Tx
Rx

For communications with the diagnostic tool. (CAN-H and CAN-L are used for control-
ling)

DDL2

K-LINE

For communications with the diagnostic tool. (CAN-H and CAN-L are used for control-
ling)

Diag on CAN

CAN-H
CAN-L

For communications with the diagnostic tool. (CAN-H and CAN-L are also used for con-
trol and diagnoses.)