Nissan Rogue. Manual - part 832

LAN

SYSTEM

LAN-27

< SYSTEM DESCRIPTION >

[CAN]

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• Termination circuits (resistors) are connected across the CAN communication system. When transmitting a

CAN communication signal, each control unit passes a current to the CAN-H line and the current returns to

the CAN-L line.

• The current flows separately into the termination circuits connected

across the CAN communication system and the termination cir-

cuits drop voltage to generate a potential difference between the

CAN-H line and the CAN-L line.

NOTE:

A signal with no current passage is called “Recessive” and one

with current passage is called “Dominant”.

• The system produces digital signals for signal communications, by

using the potential difference.

The Construction of CAN Communication Signal (Message)

JSMIA0450GB

JSMIA0543GB

JSMIA0544ZZ

JSMIA0545ZZ

LAN-28

< SYSTEM DESCRIPTION >

[CAN]

SYSTEM

CAN Communication Line

The CAN communication line is a twisted pair wire consisting of
strands of CAN-H   and CAN-L   and has noise immunity.

NOTE:

The CAN communication system has the characteristics of noise-resistant because this system produces dig-

ital signals by using the potential difference between the CAN-H line and the CAN-L line and has the twisted

pair wire structure.

Since the CAN-H line and the CAN-L line are always adjacent to

each other, the same degree of noise occurs, respectively, when a
noise   occurs. Although the noise changes the voltage, the poten-
tial difference   between the CAN-H line and the CAN-L line is

insensitive to noise. Therefore, noise-resistant signals can be

obtained.

CAN Signal Communications

Each control unit of the CAN communication system transmits signals through the CAN communication con-

trol circuit included in the control unit and receives only necessary signals from each control unit to perform

various kinds of control.

No.

Message name

Description

1

Start of frame (1 bit)

Start of message.

2

Arbitration of field (11 bit)

Priorities of message-sending are shown when there is a pos-
sibility that multiple messages are sent at the same time.

3

Control field (6 bit)

Signal quantity in data field is shown.

4

Data field (0-64 bit)

Actual signal is shown.

5

CRC field (16 bit)

• The transmitting control unit calculates sending data in ad-

vance and writes the calculated value in a message.

• The receiving control unit calculates received data and judg-

es that the data reception is normal when the calculated val-
ue is the same as the value written in the sent data. 

6

ACK field (2 bit)

The completion of normal reception is sent to the transmitting 
unit.

7

End of frame (7 bit)

End of message.

JSMIA0382ZZ

JSMIA0383ZZ

LAN

SYSTEM

LAN-29

< SYSTEM DESCRIPTION >

[CAN]

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• Example: Transmitted signals

• Example: Received signals

NOTE:

The above signal names and signal communications are provided for reference purposes. For CAN communi-

cations signals of this vehicle, refer to 

LAN-32, "CAN COMMUNICATION SYSTEM : CAN Communication

Signal Chart"

.

JSMIA0576GB

JSMIA0577GB

LAN-30

< SYSTEM DESCRIPTION >

[CAN]

SYSTEM

CAN COMMUNICATION SYSTEM : CAN Communication Control Circuit

INFOID:0000000011277518

CAN communication control circuit is incorporated into the control unit and transmits/receives CAN communi-

cation signals.

*: These are the only control units wired with both ends of CAN communication system.

CAN COMMUNICATION SYSTEM : CAN System Specification Chart

INFOID:0000000011277519

Determine CAN system type from the following specification chart.

NOTE:

Refer to 

LAN-17, "Trouble Diagnosis Flow Chart"

 for how to use CAN system specification chart.

JSMIA0453GB

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)

Generates a potential difference between CAN-H and CAN-L.

Body type

Wagon

Axle

2WD

AWD

Engine

QR25DE

Transmission

CVT

Brake control

VDC

Around view monitor system

×

×

×

×

Automatic back door system

×

×

×

×

×

×

Forward Collision Warning

×

×

CAN  system  type

1

2

3

4

5

6

7

8

CAN communication unit

ECM

×

×

×

×

×

×

×

×

ABS actuator and electric unit (control unit)

×

×

×

×

×

×

×

×

IPDM E/R

×

×

×

×

×

×

×

×

TCM

×

×

×

×

×

×

×

×

Data link connector

×

×

×

×

×

×

×

×