Infiniti G35 (V35). Manual — part 562
LAN-8
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Symptom When Error Occurs in CAN Communication System
NKS004IT
In CAN communication system, multiple units mutually transmit and receive signals. Each unit cannot transmit
and receive signals if any error occurs on CAN communication line. Under this condition, multiple control units
related to the root cause malfunction or go into fail-safe mode.
ERROR EXAMPLE
NOTE:
●
Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring.
●
Refer to
Example: TCM branch line open circuit
SKIB8738E
Unit name
Symptom
ECM
Engine torque limiting is affected, and shift harshness increases.
BCM
Reverse warning chime does not sound.
EPS control unit
Normal operation.
Combination meter
●
Shift position indicator and OD 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.
TROUBLE DIAGNOSIS
LAN-9
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
M
A
B
LAN
Example: Data link connector branch line open circuit
NOTE:
●
When data link connector branch line is open, transmission and reception of CAN communication signals
is not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit.
●
When data link connector branch line is open, the screen-display of the CONSULT-II “SELECT SYSTEM”
screen may be the same as when the CAN communication line has short-circuit. However, symptoms dif-
fer depending on the case. See below chart for the differences.
SKIB8739E
Unit name
Symptom
ECM
Normal operation.
BCM
EPS control unit
Combination meter
ABS actuator and electric unit (control unit)
TCM
IPDM E/R
SELECT SYSTEM
(CONSULT-II)
Difference of symptom
Data link connector branch line open cir-
cuit
All Diag on CAN units are not
indicated.
Normal operation.
CAN-H, CAN-L harness short-circuit
Most the units which are connected to the CAN com-
munication system enter fail-safe mode or are deac-
tivated.
LAN-10
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: Main Line Between Data Link Connector and ABS Actuator and Electric Unit (Con-
trol Unit) Open Circuit
SKIB8740E
Unit name
Symptom
ECM
Engine torque limiting is affected, and shift harshness increases.
BCM
●
Reverse warning chime does not sound.
●
The front wiper moves under continuous operation mode even though the front
wiper 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.
TROUBLE DIAGNOSIS
LAN-11
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
M
A
B
LAN
Example: CAN-H, CAN-L Harness Short Circuit
SKIB8741E
Unit name
Symptom
ECM
●
Engine torque limiting is affected, and shift harshness increases.
●
Engine speed drops.
BCM
●
Reverse warning chime 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 is OFF.)
●
The steering lock does not release (if an error or malfunction occurs while turning
the ignition switch is 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.
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