Infiniti G35 (V35). Manual — part 563
LAN-12
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Self-Diagnosis
NKS004IU
DTC
Self-diagnosis item
(CONSULT-II indication)
DTC detection condition
Inspection/Action
U1000
CAN COMM CIRCUIT
When ECM is not transmitting or receiving CAN
communication signal of OBD (emission-related
diagnosis) for 2 seconds or more.
Refer to
"TROUBLE DIAG-
NOSES WORK FLOW"
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
communication signal other than OBD (emis-
sion-related diagnosis) for 2 seconds or more.
U1002
SYSTEM COMM
When a control unit is not transmitting or receiv-
ing CAN communication signal for 2 seconds or
less.
Start the inspection.
Refer to the applicable
section of the indicated
control unit.
U1010
CONTROL UNIT [CAN]
When an error is detected during the initial diag-
nosis for CAN controller of each control unit.
Replace the control unit
indicating “U1010”.
TROUBLE DIAGNOSIS
LAN-13
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
M
A
B
LAN
CAN Diagnostic Support Monitor
NKS004IV
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)
LAN-14
[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
LAN-15
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
M
A
B
LAN
TROUBLE DIAGNOSES WORK FLOW
PFP:00004
Information Needed for Trouble Diagnosis
NKS004IW
CAN communication system performs trouble diagnosis with the following tools.
How to Use CAN Communication Signal Chart
NKS004IX
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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