Page 3361 of 4647
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)
Page 3362 of 4647
![INFINITI M35 2007 Factory Service Manual TROUBLE DIAGNOSES WORK FLOW
LAN-15
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: 2007 April2007 M35/M45
TROUBLE DIAGNOSES WORK FLOWPFP:00004
Information Needed for Trouble DiagnosisNKS004HG
C INFINITI M35 2007 Factory Service Manual TROUBLE DIAGNOSES WORK FLOW
LAN-15
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: 2007 April2007 M35/M45
TROUBLE DIAGNOSES WORK FLOWPFP:00004
Information Needed for Trouble DiagnosisNKS004HG
C](/manual-img/42/57024/w960_57024-3361.png)
TROUBLE DIAGNOSES WORK FLOW
LAN-15
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
MA
B
LAN
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
Page 3363 of 4647
LAN-16
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Revision: 2007 April2007 M35/M45
Trouble Diagnosis Flow ChartNKS004HI
SKIB8716E
Page 3364 of 4647
![INFINITI M35 2007 Factory Service Manual TROUBLE DIAGNOSES WORK FLOW
LAN-17
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: 2007 April2007 M35/M45
Trouble Diagnosis ProcedureNKS004HJ
INTERVIEW WITH CUSTOMER
Interview with the customer INFINITI M35 2007 Factory Service Manual TROUBLE DIAGNOSES WORK FLOW
LAN-17
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: 2007 April2007 M35/M45
Trouble Diagnosis ProcedureNKS004HJ
INTERVIEW WITH CUSTOMER
Interview with the customer](/manual-img/42/57024/w960_57024-3363.png)
TROUBLE DIAGNOSES WORK FLOW
LAN-17
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: 2007 April2007 M35/M45
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
Page 3365 of 4647
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" .
Page 3366 of 4647
TROUBLE DIAGNOSES WORK FLOW
LAN-19
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
MA
B
LAN
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
Page 3367 of 4647
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
Page 3368 of 4647
TROUBLE DIAGNOSES WORK FLOW
LAN-21
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: 2007 April2007 M35/M45
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