Nissan Titan A60. Manual - part 677

 

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Nissan Titan A60. Manual - part 677

 

 

LAN-4

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

CAN COMMUNICATION SYSTEM

SYSTEM DESCRIPTION

CAN COMMUNICATION SYSTEM

System Description

INFOID:0000000006179096

• 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:0000000006179097

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-5, "CAN Communication Control Circuit"

.

LAN

CAN COMMUNICATION SYSTEM

LAN-5

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

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CAN Communication Control Circuit

INFOID:0000000006179098

*: 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-6

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

DIAG ON CAN

DIAG ON CAN

Description

INFOID:0000000006179099

“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:0000000006179100

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.

LAN

TROUBLE DIAGNOSIS

LAN-7

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

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TROUBLE DIAGNOSIS

Condition of Error Detection

INFOID:0000000006179101

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

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.

CAUTION:

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

RESULTS of CONSULT-III under the above conditions. Erase the memory of the self-diagnosis of each

unit.

Symptom When Error Occurs in CAN Communication System

INFOID:0000000006179102

In CAN communication system, multiple units mutually transmit and receive signals. Each unit cannot transmit

and receive signals if any error occurs on CAN communication line. Under this condition, multiple control units

related to the root cause malfunction or go into fail-safe mode.

ERROR EXAMPLE

NOTE:

• Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring.

• Refer to 

LAN-36, "Abbreviation List"

 for the unit abbreviation.

Example: TCM branch line open circuit

SKIB8738E

Unit name

Symptom

ECM

Engine torque limiting is affected, and shift harshness increases.

BCM

Reverse warning chime does not sound.

 

 

 

 

 

 

 

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