Nissan Altima L32. Manual - part 869

LAN

LAN-5

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DLC BRANCH LINE CIRCUIT  .........................

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Diagnosis Procedure .............................................

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M&A BRANCH LINE CIRCUIT  ........................

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Diagnosis Procedure .............................................

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STRG BRANCH LINE CIRCUIT .......................

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Diagnosis Procedure .............................................

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ABS BRANCH LINE CIRCUIT  .........................

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Diagnosis Procedure .............................................

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TCM BRANCH LINE CIRCUIT .........................

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Diagnosis Procedure .............................................

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IPDM-E BRANCH LINE CIRCUIT  ....................

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Diagnosis Procedure .............................................

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CAN COMMUNICATION CIRCUIT  ..................

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Diagnosis Procedure .............................................

169

CAN SYSTEM (TYPE 12)

COMPONENT DIAGNOSIS .......................

171

MAIN LINE BETWEEN DLC AND ABS CIR-
CUIT ..................................................................

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Diagnosis Procedure .............................................

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ECM BRANCH LINE CIRCUIT .........................

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Diagnosis Procedure .............................................

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A-BAG BRANCH LINE CIRCUIT ....................

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Diagnosis Procedure  .............................................

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AV BRANCH LINE CIRCUIT  ..........................

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Diagnosis Procedure  .............................................

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BCM BRANCH LINE CIRCUIT  .......................

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Diagnosis Procedure  .............................................

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DLC BRANCH LINE CIRCUIT  ........................

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Diagnosis Procedure  .............................................

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M&A BRANCH LINE CIRCUIT  .......................

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Diagnosis Procedure  .............................................

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STRG BRANCH LINE CIRCUIT  .....................

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Diagnosis Procedure  .............................................

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ABS BRANCH LINE CIRCUIT ........................

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Diagnosis Procedure  .............................................

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TCM BRANCH LINE CIRCUIT ........................

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Diagnosis Procedure  .............................................

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IPDM-E BRANCH LINE CIRCUIT ...................

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Diagnosis Procedure  .............................................

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CAN COMMUNICATION CIRCUIT  .................

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Diagnosis Procedure  .............................................

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LAN-6

< PRECAUTION >

[CAN FUNDAMENTAL]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precautions for Trouble Diagnosis

INFOID:0000000004203842

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:0000000004203843

• 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

CAN COMMUNICATION SYSTEM

LAN-7

< FUNCTION DIAGNOSIS >

[CAN FUNDAMENTAL]

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FUNCTION DIAGNOSIS

CAN COMMUNICATION SYSTEM

System Description

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• 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

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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

Refer to 

LAN-8, "CAN Communication Control Circuit"

.

LAN-8

< FUNCTION DIAGNOSIS >

[CAN FUNDAMENTAL]

CAN COMMUNICATION SYSTEM

CAN Communication Control Circuit

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*: 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.