Nissan Note E12. Manual - part 411

LAN

PRECAUTIONS

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< PRECAUTION >

[CAN FUNDAMENTAL]

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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

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< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

SYSTEM

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

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SYSTEM

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< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

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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.)

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< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

TROUBLE DIAGNOSIS

TROUBLE DIAGNOSIS

Component Description

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Condition of Error Detection

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DTC (e.g. U1000 and U1001) of CAN communication is indicated on SELF-DIAG RESULTS on CONSULT if a

CAN communication signal is not transmitted or received between units for 2 seconds or more.

CAN COMMUNICATION SYSTEM ERROR

• CAN communication line open (CAN-H, CAN-L, or both)

• CAN communication line short (ground, between CAN communication lines, other harnesses)

• Error of CAN communication control circuit of the unit connected to CAN communication line

WHEN DTC OF CAN COMMUNICATION IS INDICATED EVEN THOUGH CAN COMMUNICATION
SYSTEM IS NORMAL

• Removal/installation of parts: Error may be detected when removing and installing CAN communication unit

and related parts while turning the ignition switch ON. (A DTC except for CAN communication may be

detected.)

• Fuse blown out (removed): CAN communication of the unit may cease.

• Voltage drop: Error may be detected if voltage drops due to discharged battery when turning the ignition

switch ON (Depending on the control unit which carries out CAN communication).

• Error may be detected if the power supply circuit of the control unit, which carries out CAN communication,

malfunctions (Depending on the control unit which carries out CAN communication).

• Error may be detected if reprogramming is not completed normally.

NOTE:

CAN communication system is normal if DTC of CAN communication is indicated on SELF-DIAG RESULTS of

CONSULT under the above conditions. Erase the memory of the self-diagnosis of each control unit.

JSMIA0527GB

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

Circuit connected across the CAN communication system. (Resistor)