Infiniti M35/M45 Y50. Manual - part 841

TROUBLE DIAGNOSIS

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[CAN FUNDAMENTAL]

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CAN Diagnostic Support Monitor

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CONSULT-II and CAN diagnostic support monitor (on-board diagnosis function) are used for detecting root
cause.

MONITOR ITEM (CONSULT-II)

Example: CAN DIAG SUPPORT MNTR indication

Without PAST

With PAST

SKIB8742E

Item

PRSNT

Description

Initial diagnosis

OK

Normal at present

NG

Control unit error (Except for some control units)

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

PRSNT

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.

–

–

Diagnosis not performed.

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

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[CAN FUNDAMENTAL]

TROUBLE DIAGNOSIS

MONITOR ITEM (ON-BOARD DIAGNOSIS)

NOTE:
For some models, CAN communication diagnosis result is received from the vehicle monitor. (CONSULT-II is
not available.)

Example: Vehicle Display 

Item

Result indi-

cated

Error counter

Description

CAN_COMM

(Initial diagnosis)

OK

0

Normal at present

NG

1 – 50

Control unit error
(The number indicates how many times diagnosis has been 
run.)

CAN_CIRC_1

(Transmission diagnosis)

OK

0

Normal at present

UNKWN

1 – 50

Unable to transmit for 2 seconds or more at present.
(The number indicates how many times diagnosis has been 
run.)

CAN_CIRC_2 – 9

(Reception diagnosis of each unit)

OK

0

Normal at present

UNKWN

1 – 50

Unable to transmit for 2 seconds or more at present.
(The number indicates how many times diagnosis has been 
run.)

Diagnosis not performed.

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

TROUBLE DIAGNOSES WORK FLOW

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[CAN FUNDAMENTAL]

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TROUBLE DIAGNOSES WORK FLOW

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Information Needed for Trouble Diagnosis

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CAN communication system performs trouble diagnosis with the following tools.

How to Use CAN Communication Signal Chart

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The CAN communication signal chart lists the signals needed for trouble diagnosis. It is useful for detecting
the root cause by finding a signal related to the symptom, and by checking transmission and reception unit.

Tool

Usage

Interview sheet

For filling in vehicle information and interview with customer.

Data sheet

For attaching CONSULT-II data or on-board diagnosis data.

Diagnosis sheet

For detecting the root cause. (Diagnosis sheet includes system diagram for every CAN system 
type)

SELECT SYSTEM
(CONSULT-II)

For checking the condition of control units and the status of CAN communication.

SELF-DIAG RESULTS
(CONSULT-II)

CAN DIAG SUPPORT MNTR
(CONSULT-II)

CAN communication signal 
chart

For converting information received from a customer into CAN communication signal transmission 
and reception. This information can be used to judge whether a circuit between control units is nor-
mal or abnormal.

Abbreviation list

For checking abbreviations in CAN communication signal chart and diagnosis sheet.

SKIB8715E

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[CAN FUNDAMENTAL]

TROUBLE DIAGNOSES WORK FLOW

Trouble Diagnosis Flow Chart

NKS004HI

SKIB8716E