INFINITI M35 2007 Factory Service Manual

LAN-14
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
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
ItemResult indi-
catedError counter Description
CAN_COMM
(Initial diagnosis)OK 0 Normal at present
NG 1 – 50Control unit error
(The number indicates how many times diagnosis has been
run.)
CAN_CIRC_1
(Transmission diagnosis)OK 0 Normal at present
UNKWN 1 – 50Unable 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 – 50Unable 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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Revision: 2007 April2007 M35/M45
TROUBLE DIAGNOSES WORK FLOWPFP:00004
Information Needed for Trouble DiagnosisNKS004HG
CAN communication system performs trouble diagnosis with the following tools.
How to Use CAN Communication Signal ChartNKS004HH
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 sheetFor 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
chartFor 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

LAN-16
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Revision: 2007 April2007 M35/M45
Trouble Diagnosis Flow ChartNKS004HI
SKIB8716E

TROUBLE DIAGNOSES WORK FLOW
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Trouble Diagnosis ProcedureNKS004HJ
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
NOTE:

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.

Indication of the combination meter is important to detect the root cause because it is the most obvious to
the customer, and it performs CAN communication with many units.
SKIB8717E

LAN-18
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Revision: 2007 April2007 M35/M45
INSPECTION OF VEHICLE CONDITION

Check whether or not “U1000” or “U1001” is indicated on “SELF-DIAG RESULTS” by CONSULT-II.
NOTE:
Root cause cannot be detected using the procedure in this section if “U1000” or “U1001” is not indicated.

Check whether the symptom is reproduced or not.
NOTE:

Do not turn the ignition switch OFF or disconnect the battery cable while reproducing the error. The
error may temporarily correct itself, making it difficult to determine the root cause.

The procedures for present errors differ from the procedures for past errors. Refer to LAN-25,
"DETECT THE ROOT CAUSE" .

TROUBLE DIAGNOSES WORK FLOW
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Revision: 2007 April2007 M35/M45
CHECK OF CAN SYSTEM TYPE (HOW TO USE CAN SYSTEM TYPE SPECIFICATION CHART)
Determine CAN system type based on vehicle equipment. Then choose the correct diagnosis sheet.
NOTE:
There are two styles for CAN system type specification charts. Depending on the number of available system
types, either style A or style B may be used.
CAN System Type Specification Chart (Style A)
NOTE:
CAN system type is easily checked with the vehicle equipment identification information shown in the chart.
SKIB8888E

LAN-20
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Revision: 2007 April2007 M35/M45
CAN System Type Specification Chart (Style B)
NOTE:
CAN system type is easily checked with the vehicle equipment identification information shown in the chart.
SKIB8889E

TROUBLE DIAGNOSES WORK FLOW
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CREATE INTERVIEW SHEET
Fill out the symptom described by the customer, vehicle condition, and CAN system type on the interview
sheet.
Interview Sheet (Example)
SKIB8890E

LAN-22
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Revision: 2007 April2007 M35/M45
CREATE DATA SHEET
Create CONSULT-II Data Attachment Sheet
Print out the following CONSULT-II screens, and attach them to the CONSULT-II data attachment sheet.

SELECT SYSTEM

SELF-DIAG RESULTS

CAN DIAG SUPPORT MNTR
NOTE:
Some items may not be needed depending on CAN system type of vehicle.
SKIB8721E

TROUBLE DIAGNOSES WORK FLOW
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Revision: 2007 April2007 M35/M45
Create On-board Diagnosis Copy Sheet
Display the trouble diagnosis result of CAN communication with the on-board diagnosis function on the vehicle
monitor, etc. Copy them on the on-board diagnosis copy sheet.
NOTE:
For some models, CAN communication diagnosis result is received from the vehicle monitor. (CONSULT-II is
not available.)
SKIB8722E