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LAN

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K ELECTRICAL

SECTION LAN LAN SYSTEM
B

E
CONTENTS
CAN FUNDAMENTAL HOW TO USE THIS SECTION ................................ 21 . F
Caution .................................................................. 21
.
PRECAUTIONS ......................................................... 3
. Abbreviation List .................................................... 21.
Precautions for Trouble Diagnosis .......................... 3 . PRECAUTIONS ....................................................... 22 . G
Precautions for Harness Repair .............................. 3 . Precautions for Supplemental Restraint System
SYSTEM DESCRIPTION ........................................... 4 . (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
CAN Communication System .................................. 4 . SIONER" ................................................................ 22
.
SYSTEM DIAGRAM ............................................. 4 . H
Precautions for Trouble Diagnosis ........................ 22 .
CAN COMMUNICATION CONTROL CIRCUIT..... 5 Precautions for Harness Repair ............................ 22 .
Diag on CAN ........................................................... 6
. TROUBLE DIAGNOSIS ........................................... 23 .
DESCRIPTION ..................................................... 6
. CAN System Specification Chart ........................... 23 . I
SYSTEM DIAGRAM ............................................. 6 . VEHICLE EQUIPMENT IDENTIFICATION
TROUBLE DIAGNOSIS ............................................. 7 . INFORMATION ................................................... 24 .
Condition of Error Detection .................................... 7. CAN Communication Signal Chart ........................ 25 . J
CAN COMMUNICATION SYSTEM ERROR ........ 7 . TYPE 1/TYPE 2/TYPE 3/TYPE 4 ....................... 25 .
WHEN "U1000" OR "U1001" IS INDICATED TYPE 5/TYPE 6/TYPE 7/TYPE 8/TYPE 9/TYPE
EVEN THOUGH CAN COMMUNICATION SYS- 10 ....................................................................... 26
.
TEM IS NORMAL ................................................. 7. LAN
TYPE 1/TYPE 2/TYPE 3/TYPE 4 ....................... 25 .
Symptom When Error Occurs in CAN Communi- Schematic .............................................................. 30
.
cation System .......................................................... 8
. Wiring Diagram -- CAN -- .................................... 31 .
ERROR EXAMPLE .............................................. 8 . Interview Sheet ...................................................... 34. L
CAN Diagnosis with CONSULT-III ......................... 12 . Component Parts Location .................................... 35 .
Self-Diagnosis ....................................................... 12
. Harness Layout ..................................................... 35 .
CAN Diagnostic Support Monitor .......................... 13 . Malfunction Area Chart .......................................... 36 . M
MONITOR ITEM (CONSULT-III) ........................ 13 . MAIN LINE ......................................................... 36 .
MONITOR ITEM (ON-BOARD DIAGNOSIS) ..... 14 . BRANCH LINE ................................................... 36 .
How to Use CAN Communication Signal Chart .... 14 . SHORT CIRCUIT ............................................... 36 .
TROUBLE DIAGNOSES WORK FLOW ................. 15 . Main Line Between ABS Actuator and Electric Unit
Trouble Diagnosis Flow Chart ............................... 15 . (Control Unit) and Data Link Connector ................ 37 .
Trouble Diagnosis Procedure ................................ 16 . Main Line Between ABS Actuator and Electric Unit
INTERVIEW WITH CUSTOMER ........................ 16 . (Control Unit) and TCM ......................................... 38 .
INSPECTION OF VEHICLE CONDITION .......... 16 . Main Line Between TCM and Data Link Connector 38 ...
CHECK OF CAN SYSTEM TYPE (HOW TO USE ECM Branch Line Circuit ....................................... 39 .
CAN SYSTEM TYPE SPECIFICATION CHART) 17 ... ABS Actuator and Electric Unit (Control Unit) Branch
CREATE INTERVIEW SHEET ........................... 19 . Line Circuit ............................................................. 40
.
DETECT THE ROOT CAUSE ............................ 19 . TCM Branch Line Circuit ....................................... 41 .
Audio Unit Branch Line Circuit ............................... 41 .
CAN BCM Branch Line Circuit ....................................... 42 .
Data Link Connector Branch Line Circuit .............. 43 .
INDEX FOR DTC ..................................................... 20
. EPS Control Unit Branch Line Circuit .................... 43 .
DTC No. Index ...................................................... 20
.

Revision: December 2006 LAN-1 2007 Sentra
Intelligent Key Unit Branch Line Circuit ................. 44
. IPDM E/R Branch Line Circuit ................................46
.
Combination Meter Branch Line Circuit ................. 44
. CAN Communication Circuit ..................................46
.
Double Meter Branch Line Circuit .......................... 45
.

Revision: December 2006 LAN-2 2007 Sentra
PRECAUTIONS
[CAN FUNDAMENTAL]
PRECAUTIONS PFP:00001
A
Precautions for Trouble Diagnosis UKS005Y0

CAUTION:
G Never apply 7.0 V or more to the measurement terminal. B
G Use a tester with open terminal voltage of 7.0 V or less.
G Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when
checking the harness. C
Precautions for Harness Repair UKS005Y1

G Solder the repaired area and wrap tape around the soldered D
area.
NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).
E

SKIB8766E
G
G Bypass connection is never allowed at the repaired area.
NOTE:
H
Bypass connection may cause CAN communication error. The
spliced wire becomes separated and the characteristics of
twisted line are lost.
I

SKIB8767E

G Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communi- LAN
cation line.

Revision: December 2006 LAN-3 2007 Sentra
SYSTEM DESCRIPTION
[CAN FUNDAMENTAL]
SYSTEM DESCRIPTION PFP:00000

CAN Communication System UKS005Y2

G 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).
G 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.
G CAN communication lines adopt twisted-pair line style (two lines twisted) for noise immunity.
SYSTEM DIAGRAM

SKIB8887E

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.
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 LAN-5, "CAN COMMUNICATION CONTROL CIRCUIT" .

Revision: December 2006 LAN-4 2007 Sentra
SYSTEM DESCRIPTION
[CAN FUNDAMENTAL]
CAN COMMUNICATION CONTROL CIRCUIT
A

SKIB8713E

Component System description G
CAN controller It controls CAN communication signal transmission and reception, error detection, etc.
It converts digital signal into CAN communication signal, and CAN communication signal into digi-
Transceiver IC
tal signal.
H

Noise filter It eliminates noise of CAN communication signal.

Termination circuit* It produces potential difference. I
(Resistance of approx. 120 )
*: These are the only control units wired with both ends of CAN communication system.
J

LAN

Revision: December 2006 LAN-5 2007 Sentra
SYSTEM DESCRIPTION
[CAN FUNDAMENTAL]
Diag on CAN UKS005Y3

DESCRIPTION
"Diag on CAN" is a diagnosis using CAN communication instead of previous DDL1 and DDL2 communication
lines, between control units and diagnosis unit.
SYSTEM DIAGRAM

SKIB8714E

Name Harness Description
Tx
DDL1 It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
Rx
DDL2 K-LINE It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
CAN-H
Diag on CAN It is used for trouble diagnosis and control.
CAN-L

Revision: December 2006 LAN-6 2007 Sentra
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS PFP:00004
A
Condition of Error Detection UKS005Y4

"U1000" or "U1001" is indicated on SELF-DIAG RESULTS on CONSULT-III if CAN communication signal is
not transmitted or received between units for 2 seconds or more. B
CAN COMMUNICATION SYSTEM ERROR
G CAN communication line open (CAN-H, CAN-L, or both)
C
G CAN communication line short (ground, between CAN communication lines, other harnesses)
G Error of CAN communication control circuit of the unit connected to CAN communication line
WHEN "U1000" OR "U1001" IS INDICATED EVEN THOUGH CAN COMMUNICATION SYSTEM D
IS NORMAL
G 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 E
detected.)
G Fuse blown out (removed): CAN communication of the unit may cease.
G Voltage drop: Error may be detected if voltage drops due to discharged battery when turning the ignition F
switch ON (Depending on the control unit which carries out CAN communication).
G 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).
G
G 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- H
SULT-III under the above conditions. Erase the memory of the self-diagnosis of each unit.

LAN

Revision: December 2006 LAN-7 2007 Sentra
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
Symptom When Error Occurs in CAN Communication System UKS005Y5

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:
G Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring.
G Refer to LAN-21, "Abbreviation List" for the unit abbreviation.
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.
G Shift position indicator and OD OFF indicator turn OFF.
Combination meter
G Warning lamps turn ON.
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
IPDM E/R Normal operation.

Revision: December 2006 LAN-8 2007 Sentra
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
Example: Data link connector branch line open circuit
A

SKIB8739E

Unit name Symptom G
ECM
BCM
H
EPS control unit
Combination meter Normal operation.
ABS actuator and electric unit (control unit) I
TCM
IPDM E/R
J
NOTE:
G 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. LAN
G The model (all units on CAN communication system are Diag on CAN) cannot perform CAN diagnosis
with CONSULT-III if the following error occurs. The error is judged by the symptom.
Error Difference of symptom L
Data link connector branch line open circuit Normal operation
Most of the units which are connected to the CAN communication sys-
CAN-H, CAN-L harness short-circuit M
tem enter fail-safe mode or are deactivated.

Revision: December 2006 LAN-9 2007 Sentra
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
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.
G Reverse warning chime does not sound.
BCM G 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.
G The shift position indicator and OD OFF indicator turn OFF.
Combination meter G The speedometer is inoperative.
G The odo/trip meter stops.
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
When the ignition switch is ON,
IPDM E/R G The headlamps (Lo) turn ON.
G The cooling fan continues to rotate.

Revision: December 2006 LAN-10 2007 Sentra
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
Example: CAN-H, CAN-L Harness Short Circuit
A

SKIB8741E

Unit name Symptom G
G Engine torque limiting is affected, and shift harshness increases.
ECM
G Engine speed drops.
H
G Reverse warning chime does not sound.
G The front wiper moves under continuous operation mode even though the front
wiper switch being in the intermittent position.
I
G The room lamp does not turn ON.
BCM
G The engine does not start (if an error or malfunction occurs while turning the igni-
tion switch OFF.)
G The steering lock does not release (if an error or malfunction occurs while turning J
the ignition switch OFF.)
EPS control unit The steering effort increases.
LAN
G The tachometer and the speedometer do not move.
Combination meter G Warning lamps turn ON.
G Indicator lamps do not turn ON.
L
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
When the ignition switch is ON, M
IPDM E/R G The headlamps (Lo) turn ON.
G The cooling fan continues to rotate.

Revision: December 2006 LAN-11 2007 Sentra
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
CAN Diagnosis with CONSULT-III UKS007BN

CAN diagnosis on CONSULT-III extracts the root cause by receiving the following information.
G Response to the system call
G Control unit diagnosis information
G Self-diagnosis
G CAN diagnostic support monitor
Self-Diagnosis UKS005Y6

Self-diagnosis item
DTC DTC detection condition Inspection/Action
(CONSULT-III indication)
When ECM is not transmitting or receiving CAN
communication signal of OBD (emission-related
diagnosis) for 2 seconds or more.
U1000 CAN COMM CIRCUIT
When a control unit (except for ECM) is not Refer to LAN-15,
transmitting or receiving CAN communication "TROUBLE DIAG-
signal for 2 seconds or more. NOSES WORK FLOW" .
When ECM is not transmitting or receiving CAN
U1001 CAN COMM CIRCUIT communication signal other than OBD (emis-
sion-related diagnosis) for 2 seconds or more.
Start the inspection.
When a control unit is not transmitting or receiv-
Refer to the applicable
U1002 SYSTEM COMM ing CAN communication signal for 2 seconds or
section of the indicated
less.
control unit.
When an error is detected during the initial diag- Replace the control unit
U1010 CONTROL UNIT [CAN]
nosis for CAN controller of each control unit. indicating "U1010".

Revision: December 2006 LAN-12 2007 Sentra
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
CAN Diagnostic Support Monitor UKS005Y7

MONITOR ITEM (CONSULT-III) A
Example: CAN DIAG SUPPORT MNTR indication
B

G
PKID1075E

Without PAST
H
Item PRSNT Description
OK Normal at present
Initial diagnosis
NG Control unit error (Except for some control units) I
OK Normal at present
Transmission diagnosis Unable to transmit signals for 2 seconds or more.
UNKWN J
Diagnosis not performed
OK Normal at present

Control unit name Unable to receive signals for 2 seconds or more. LAN
(Reception diagnosis) UNKWN Diagnosis not performed
No control unit for receiving signals. (No applicable optional parts)
L
With PAST
Item PRSNT PAST Description
OK Normal at present and in the past M
OK Normal at present, but unable to transmit signals for 2 seconds or more
Transmission diagnosis 1

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