Nissan Note E12. Manual — part 412
LAN
TROUBLE DIAGNOSIS
LAN-9
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
Symptom When Error Occurs in CAN Communication System
INFOID:0000000009014726
In CAN communication system, multiple control units mutually transmit and receive signals. Each control unit
cannot transmit and receive signals if any error occurs on CAN communication line. Under this condition, mul-
tiple control units related to the root cause malfunction or go into fail-safe mode.
ERROR EXAMPLE
NOTE:
Each vehicle differs in symptom of each control unit under fail-safe mode and CAN communication line wiring.
Example: Main Line Between Data Link Connector and ABS Actuator and Electric Unit (Control Unit) Open Circuit
JSMIA0442GB
Unit name
Major symptom
ECM
Engine torque limiting is affected, and shift harshness increases.
BCM
• Reverse warning buzzer does not sound.
• The front wiper moves under continuous operation mode even though the front wip-
er switch being in the intermittent position.
EPS control unit
The steering effort increases.
Combination meter
• The shift position indicator and OD OFF indicator turn OFF.
• The speedometer is inoperative.
• The odo/trip meter stops.
ABS actuator and electric unit (control unit)
Normal operation.
TCM
No impact on operation.
IPDM E/R
When the ignition switch is ON,
• The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.
LAN-10
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: TCM Branch Line Open Circuit
NOTE:
The model (all control units on CAN communication system are Diag on CAN) cannot perform CAN diagnosis
with CONSULT if the following error occurs. The error is judged by the symptom.
Example: Data Link Connector Branch Line Open Circuit
JSMIA0443GB
Unit name
Major symptom
ECM
Engine torque limiting is affected, and shift harshness increases.
BCM
Reverse warning buzzer does not sound.
EPS control unit
Normal operation.
Combination meter
• Shift position indicator and O/D OFF indicator turn OFF.
• Warning lamps turn ON.
ABS actuator and electric unit (control unit)
Normal operation.
TCM
No impact on operation.
IPDM E/R
Normal operation.
Error
Difference of symptom
Data link connector branch line open circuit
Normal operation.
CAN-H, CAN-L harness short-circuit
Most of the control units which are connected to the CAN commu-
nication system enter fail-safe mode or are deactivated.
JSMIA0444GB
LAN
TROUBLE DIAGNOSIS
LAN-11
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
NOTE:
When data link connector branch line is open, transmission and reception of CAN communication signals are
not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit.
Example: CAN-H, CAN-L Harness Short Circuit
CAN Diagnosis with CONSULT
INFOID:0000000009014727
CAN diagnosis on CONSULT extracts the root cause by receiving the following information.
Unit name
Major symptom
ECM
Normal operation.
BCM
EPS control unit
Combination meter
ABS actuator and electric unit (control unit)
TCM
IPDM E/R
JSMIA0445GB
Unit name
Major symptom
ECM
• Engine torque limiting is affected, and shift harshness increases.
• Engine speed drops.
BCM
• Reverse warning buzzer does not sound.
• The front wiper moves under continuous operation mode even though the front
wiper switch being in the intermittent position.
• The room lamp does not turn ON.
• The engine does not start (if an error or malfunction occurs while turning the igni-
tion switch OFF.)
• The steering lock does not release (if an error or malfunction occurs while turning
the ignition switch OFF.)
EPS control unit
The steering effort increases.
Combination meter
• The tachometer and the speedometer do not move.
• Warning lamps turn ON.
• Indicator lamps do not turn ON.
ABS actuator and electric unit (control unit)
Normal operation.
TCM
No impact on operation.
IPDM E/R
When the ignition switch is ON,
• The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.
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
INFOID:0000000009014728
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
INFOID:0000000009014729
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)
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