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LAN

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LAN SYSTEM

K ELECTRICAL

SECTION LAN LAN SYSTEM
B

E
CONTENTS
CAN CAN COMMUNICATION .......................................... 16 . F
System Description ................................................ 16.
PRECAUTIONS ......................................................... 3 . CAN Communication Unit ...................................... 16 .
Precautions for Supplemental Restraint System TYPE 1 ............................................................... 16
. G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- TYPE 2 ............................................................... 17
.
SIONER" ................................................................. 3
. TYPE 3 ............................................................... 18
.
Precautions for Trouble Diagnosis .......................... 3 . TYPE 4 ............................................................... 19
.
CAN SYSTEM ...................................................... 3 . H
TYPE 5 ............................................................... 20
.
Precautions for Harness Repair .............................. 3 . CAN SYSTEM (TYPE 1) .......................................... 22 .
CAN SYSTEM ...................................................... 3 . Component Parts and Harness Connector Location 22 ...
TROUBLE DIAGNOSES WORK FLOW ................... 4 . Wiring Diagram -- CAN -- .................................... 23 . I
When Displaying CAN Communication System Check Sheet .......................................................... 25
.
Errors ...................................................................... 4
. CHECK SHEET RESULTS (EXAMPLE) ............ 26 .
WHEN A MALFUNCTION IS DETECTED BY Between TCM and ABS Actuator and Electric Unit J
CAN COMMUNICATION SYSTEM ...................... 4 . (Control Unit) Circuit Inspection ............................. 31 .
WHEN A MALFUNCTION IS DETECTED ECM Circuit Inspection .......................................... 32 .
EXCEPT CAN COMMUNICATION SYSTEM ....... 4 . TCM Circuit Inspection .......................................... 33 .
TROUBLE DIAGNOSIS FLOW CHART .............. 5 . LAN
ABS Actuator and Electric Unit (Control Unit) Circuit
Diagnosis Procedure ............................................... 6 . Inspection .............................................................. 33
.
SELECTING CAN SYSTEM TYPE (HOW TO Combination Meter Circuit Inspection .................... 34 .
USE SPECIFICATION TABLE) ............................ 6 . CAN Communication Circuit Inspection ................ 35 . L
ACQUISITION OF DATA BY CONSULT-II ........... 7 . CAN SYSTEM (TYPE 2) .......................................... 39 .
HOW TO USE CHECK SHEET TABLE ............... 8 . Component Parts and Harness Connector Location 39 ...
CAN Diagnostic Support Monitor .......................... 13 . Wiring Diagram -- CAN -- .................................... 40 . M
DESCRIPTION OF "CAN DIAG SUPPORT Check Sheet .......................................................... 42
.
MNTR" SCREEN FOR ECM .............................. 13 . CHECK SHEET RESULTS (EXAMPLE) ............ 43 .
DESCRIPTION OF "CAN DIAG SUPPORT Between ABS Actuator and Electric Unit (Control
MNTR" SCREEN FOR TCM .............................. 14 . Unit) and AWD Control Unit Circuit Inspection ...... 48 .
DESCRIPTION OF "CAN DIAG SUPPORT ECM Circuit Inspection .......................................... 49 .
MNTR" SCREEN FOR ABS ACTUATOR AND ABS Actuator and Electric Unit (Control Unit) Circuit
ELECTRIC UNIT (CONTROL UNIT) .................. 14 . Inspection .............................................................. 49
.
DESCRIPTION OF "CAN DIAG SUPPORT AWD Control Unit Circuit Inspection ...................... 50 .
MNTR" SCREEN FOR VDC/TCS/ABS CON- Combination Meter Circuit Inspection .................... 50 .
TROL UNIT ........................................................ 15 . CAN Communication Circuit Inspection ................ 51 .
DESCRIPTION OF "CAN DIAG SUPPORT CAN SYSTEM (TYPE 3) .......................................... 55 .
MNTR" SCREEN FOR AWD CONTROL UNIT ... 15 Component Parts and Harness Connector Location 55 ...
Wiring Diagram -- CAN -- .................................... 56 .
Check Sheet .......................................................... 58
.
CHECK SHEET RESULTS (EXAMPLE) ............ 59 .
Between TCM and ABS Actuator and Electric Unit

Revision: 2005 March LAN-1 2005 X-Trail
(Control Unit) Circuit Inspection ............................. 66 . AWD Control Unit Circuit Inspection ......................88 .
Between ABS Actuator and Electric Unit (Control Combination Meter Circuit Inspection ....................89 .
Unit) and AWD Control Unit Circuit Inspection ...... 67 . CAN Communication Circuit Inspection .................89 .
ECM Circuit Inspection .......................................... 68 . CAN SYSTEM (TYPE 5) ...........................................93 .
TCM Circuit Inspection .......................................... 69 . Component Parts and Harness Connector Location ...93
ABS Actuator and Electric Unit (Control Unit) Circuit Wiring Diagram -- CAN -- ....................................94 .
Inspection .............................................................. 69
. Check Sheet ..........................................................96
.
AWD Control Unit Circuit Inspection ...................... 70 . CHECK SHEET RESULTS (EXAMPLE) .............97 .
Combination Meter Circuit Inspection .................... 70 . Between TCM and VDC/TCS/ABS Control Unit Cir-
CAN Communication Circuit Inspection ................. 71 . cuit Inspection ...................................................... 105
.
CAN SYSTEM (TYPE 4) .......................................... 76 . Between VDC/TCS/ABS Control Unit and AWD
Component Parts and Harness Connector Location 76 ... Control Unit Circuit Inspection ............................. 106 .
Wiring Diagram -- CAN -- .................................... 77 . ECM Circuit Inspection ........................................ 107 .
Check Sheet .......................................................... 79
. TCM Circuit Inspection ......................................... 107 .
CHECK SHEET RESULTS (EXAMPLE) ............ 80 . VDC/TCS/ABS Control Unit Circuit Inspection .... 108 .
Between VDC/TCS/ABS Control Unit and AWD Steering Angle Sensor Circuit Inspection ............. 108 .
Control Unit Circuit Inspection ............................... 86 . AWD Control Unit Circuit Inspection .................... 109 .
ECM Circuit Inspection .......................................... 87 . Combination Meter Circuit Inspection .................. 109 .
VDC/TCS/ABS Control Unit Circuit Inspection ...... 87 . CAN Communication Circuit Inspection ............... 110 .
Steering Angle Sensor Circuit Inspection .............. 88 .

Revision: 2005 March LAN-2 2005 X-Trail
PRECAUTIONS
[CAN]
PRECAUTIONS
[CAN] PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" AKS00BCH

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual. C
WARNING:
q To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer. D
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section. E
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors. F
Precautions for Trouble Diagnosis AKS00BCI

CAN SYSTEM
G
q Do not apply voltage of 7.0 V or higher to the measurement terminals.
q Use the tester with its open terminal voltage being 7.0 V or less.
q Be sure to turn ignition switch off and disconnect battery cable at negative terminal before checking the H
circuit.
Precautions for Harness Repair AKS00BCJ

CAN SYSTEM I
q Solder the repaired parts, and wrap with tape. [Frays of twisted
line must be within 110 mm (4.33 in)]
J

LAN

L
PKIA0306E

q Do not perform bypass wire connections for the repair parts. M
(The spliced wire will become separated and the characteristics
of twisted line will be lost.)

PKIA0307E

Revision: 2005 March LAN-3 2005 X-Trail
TROUBLE DIAGNOSES WORK FLOW
[CAN]
TROUBLE DIAGNOSES WORK FLOW PFP:00004

When Displaying CAN Communication System Errors AKS00BQF

WHEN A MALFUNCTION IS DETECTED BY CAN COMMUNICATION SYSTEM
q CAN communication line is open. (CAN H, CAN L, or both)
q CAN communication line is shorted. (Ground, between CAN lines, or other harnesses)
q The areas related to CAN communication of unit is malfunctioning.
WHEN A MALFUNCTION IS DETECTED EXCEPT CAN COMMUNICATION SYSTEM
q Removal and installation of parts: When the units that perform CAN communication or the sensors related
to CAN communication are removed and installed, malfunction may be detected (or DTC other than CAN
communication may be detected).
q Fuse blown out (removed): CAN communication of the unit may be stopped at such time.
q Low voltage: If the voltage decreases because of battery discharge when IGN is ON, malfunction may be
detected by self-diagnosis according to the units.

Revision: 2005 March LAN-4 2005 X-Trail
TROUBLE DIAGNOSES WORK FLOW
[CAN]
TROUBLE DIAGNOSIS FLOW CHART
A

LAN

L
PKIA8959E

q Step 1: Refer to LAN-6, "SELECTING CAN SYSTEM TYPE (HOW TO USE SPECIFICATION TABLE)" .
q Step 2: Refer to LAN-7, "ACQUISITION OF DATA BY CONSULT-II" . M
q Step 3: Refer to LAN-8, "HOW TO USE CHECK SHEET TABLE" .
q Step 4: Refer to LAN-9, "Example of Filling in Check Sheet When Initial Conditions Are Reproduced" .
q Step 5: Check and repair according to system diagnosis.

Revision: 2005 March LAN-5 2005 X-Trail
TROUBLE DIAGNOSES WORK FLOW
[CAN]
Diagnosis Procedure AKS00BQG

SELECTING CAN SYSTEM TYPE (HOW TO USE SPECIFICATION TABLE)
Determine CAN system type from the equipment of the vehicle to select applicable check sheet.

PKIA8960E

Revision: 2005 March LAN-6 2005 X-Trail
TROUBLE DIAGNOSES WORK FLOW
[CAN]
ACQUISITION OF DATA BY CONSULT-II
Attach the data acquired by CONSULT-II on the check sheet determined according to CAN system type. A

LAN

PKIA8961E

Revision: 2005 March LAN-7 2005 X-Trail
TROUBLE DIAGNOSES WORK FLOW
[CAN]
HOW TO USE CHECK SHEET TABLE

PKIA8962E

1. Unit names displayed on CONSULT-II
2. "NG": Display "NG" when malfunction is detected in the initial diagnosis of the diagnosed unit. Replace the
unit if "NG" is displayed.
"

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