Nissan Versa Note. Manual — part 541

LAN-12

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

TROUBLE DIAGNOSIS

• Response to the system call

• Control unit diagnosis information

• Self-diagnosis

• CAN diagnostic support monitor

Self-Diagnosis

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If communication signals cannot be transmitted or received among control units communicating via CAN com-

munication line, CAN communication-related DTC is displayed on the CONSULT “Self Diagnostic Result”

screen.

NOTE:

The following table shows examples of CAN communication-related DTC. For other DTC, refer to the applica-

ble sections.

CAN Diagnostic Support Monitor

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MONITOR ITEM (CONSULT)

Example: CAN DIAG SUPPORT MNTR indication

Without PAST

DTC

Self-diagnosis item

(CONSULT indication)

DTC detection condition

Inspection/Action

U1000

CAN COMM CIRCUIT

ECM

When ECM is not transmitting or receiving CAN
communication signal of OBD (emission-relat-
ed diagnosis) for 2 seconds or more.

Start the inspection. Re-
fer to the applicable sec-
tion of the indicated
control unit.

Except
for ECM

When a control unit (except for ECM) is not
transmitting or receiving CAN communication
signal for 2 seconds or more.

U1001

CAN COMM CIRCUIT

When ECM is not transmitting or receiving CAN communi-
cation signal other than OBD (emission-related diagnosis)
for 2 seconds or more.

U1002

SYSTEM COMM

When a control unit is not transmitting or receiving CAN
communication signal for 2 seconds or less.

U1010

CONTROL UNIT(CAN)

When an error is detected during the initial diagnosis for
CAN controller of each control unit.

Replace the control unit
indicating “U1010”.

JSMIA0964GB

Item

PRESENT

Description

Initial diagnosis

OK

Normal at present

NG

Control unit error (Except for some control units)

LAN

TROUBLE DIAGNOSIS

LAN-13

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

With PAST

Transmission diagnosis

OK

Normal at present

UNKWN

Unable to transmit signals for 2 seconds or more.

Diagnosis not performed

Control unit name

(Reception diagnosis)

OK

Normal at present

UNKWN

Unable to receive signals for 2 seconds or more.

Diagnosis not performed

No control unit for receiving signals. (No applicable optional parts)

Item

PRESENT

Description

Item

PRESENT

PAST

Description

Transmission diagnosis

OK

OK

Normal at present and in the past

1 – 39

Normal at present, but unable to transmit signals for 2 seconds or more
in the past. (The number indicates the number of ignition switch cycles
from OFF to ON.)

UNKWN

0

Unable to transmit signals for 2 seconds or more at present.

Control unit name

(Reception diagnosis)

OK

OK

Normal at present and in the past

1 – 39

Normal at present, but unable to receive signals for 2 seconds or more
in the past. (The number indicates the number of ignition switch cycles
from OFF to ON.)

UNKWN

0

Unable to receive signals for 2 seconds or more at present.

Not diagnosed

–

Diagnosis not performed.

No control unit for receiving signals. (No applicable optional parts)

LAN-14

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

TROUBLE DIAGNOSIS

How to Use CAN Communication Signal Chart

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The CAN communication signal chart lists the signals transmitted/received among control units. It is useful for

detecting the root cause by finding a signal related to the symptom, and by checking transmission and recep-

tion unit.

JSMIA0446GB

LAN

DIAGNOSIS AND REPAIR WORKFLOW

LAN-15

< BASIC INSPECTION >

[CAN FUNDAMENTAL]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Trouble Diagnosis Flow Chart

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Trouble Diagnosis Procedure

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INTERVIEW WITH CUSTOMER

Interview with the customer is important to detect the root cause of CAN communication system errors and to

understand vehicle condition and symptoms for proper trouble diagnosis.

Points in interview

• What: Parts name, system name

• When: Date, Frequency

• Where: Road condition, Place

• In what condition: Driving condition/environment

• Result: Symptom

Notes for checking error symptoms:

• Check normal units as well as error symptoms.

- Example: Circuit between ECM and the combination meter is judged normal if the customer indicates

tachometer functions normally.

• When a CAN communication system error is present, multiple control units may malfunction or go into fail-

safe mode.

JSMIA0528GB