Infiniti G35 (V35). Manual — part 561
LAN-4
[CAN FUNDAMENTAL]
SYSTEM DESCRIPTION
SYSTEM DESCRIPTION
PFP:00000
CAN Communication System
NKS004IQ
●
CAN communication is a multiplex communication system. This enables the system to transmit and
receive large quantities of data at high speed by connecting control units with two communication lines
(CAN-H and CAN-L).
●
Control units on the CAN network transmit signals using the CAN communication control circuit. They
receive only necessary signals from other control units to operate various functions.
●
CAN communication lines adopt twisted-pair line style (two lines twisted) for noise immunity.
SYSTEM DIAGRAM
Each control unit passes an electric current to the termination circuits when transmitting CAN communication
signal. The termination circuits produce an electrical potential difference between CAN-H and CAN-L. CAN
communication system transmits and receives CAN communication signals by the potential difference.
SKIB8887E
Component
Description
Main line
CAN communication line between splices
Branch line
CAN communication line between splice and a control unit
Splice
A point connecting a branch line with a main line
Termination circuit
Refer to
SYSTEM DESCRIPTION
LAN-5
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
M
A
B
LAN
CAN COMMUNICATION CONTROL CIRCUIT
*: These are the only control units wired with both ends of CAN communication system.
SKIB8713E
Component
System description
CAN controller
It controls CAN communication signal transmission and reception, error detection, etc.
Transceiver IC
It converts digital signal into CAN communication signal, and CAN communication signal into digi-
tal signal.
Noise filter
It eliminates noise of CAN communication signal.
Termination circuit
*
(Resistance of approx. 120
Ω
)
It produces potential difference.
LAN-6
[CAN FUNDAMENTAL]
SYSTEM DESCRIPTION
Diag on CAN
NKS004IR
DESCRIPTION
“Diag on CAN” is a diagnosis using CAN communication instead of previous DDL1 and DDL2 communication
line, between control unit and diagnosis unit.
SYSTEM DIAGRAM
SKIB8714E
Name
Harness
Description
DDL1
Tx
Rx
It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
DDL2
K-LINE
It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
Diag on CAN
CAN-H
CAN-L
It is used for trouble diagnosis and control.
TROUBLE DIAGNOSIS
LAN-7
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
M
A
B
LAN
TROUBLE DIAGNOSIS
PFP:00004
Condition of Error Detection
NKS004IS
“U1000” or “U1001” is indicated on SELF-DIAG RESULTS on CONSULT-II if CAN communication signal is not
transmitted or received between units for 2 seconds or more.
CAN COMMUNICATION SYSTEM ERROR
●
CAN communication line open (CAN-H, CAN-L, or both)
●
CAN communication line short (ground, between CAN communication lines, other harnesses)
●
Error of CAN communication control circuit of the unit connected to CAN communication line
WHEN INDICATED “U1000” OR “U1001” IS INDICATED EVEN THOUGH CAN COMMUNICA-
TION SYSTEM IS NORMAL
●
CONSULT-II CONVERTER not connected: Error may be detected by the self-diagnosis when not using
CONSULT-II CONVERTER (Depending on the control unit which carries out CAN communication).
●
Removal/installation of parts: Error may be detected when removing and installing CAN communication
unit and related parts while turning the ignition switch ON. (A DTC except for CAN communication may be
detected.)
●
Fuse blown out (removed): CAN communication of the unit may cease.
●
Voltage drop: Error may be detected if voltage drops due to discharged battery when turning the ignition
switch ON (Depending on the control unit which carries out CAN communication).
●
Error may be detected if the power supply circuit of the control unit, which carries out CAN communica-
tion, malfunctions (Depending on the control unit which carries out CAN communication).
●
Error may be detected if reprogramming is not completed normally.
NOTE:
CAN communication system is normal if “U1000” or “U1001” is indicated on SELF-DIAG RESULTS of CON-
SULT-II under the above conditions. Erase the memory of the self-diagnosis of each unit.
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