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LAN


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K ELECTRICAL

                                                                                                                                                                A




                                                                                SECTION                    LAN    LAN SYSTEM
                                                                                                                                                                B



                                                                                                                                                                C



                                                                                                                                                                D



                                                                                                                                                                E
                                                              CONTENTS
                   CAN FUNDAMENTAL                                                                               CAN                                            F

PRECAUTIONS ......................................................... 3
                                                                    .         INDEX FOR DTC ...................................................... 40  .
 Precautions When Using CONSULT-II .................... 3           .           DTC No. Index ....................................................... 40
                                                                                                                                                       .
                                                                                                                                                                G
 Precautions for Trouble Diagnosis .......................... 3     .         HOW TO USE THIS SECTION ................................ 41              .
 Precautions for Harness Repair .............................. 3    .           Caution .................................................................. 41
                                                                                                                                                       .
SYSTEM DESCRIPTION ........................................... 4    .           Abbreviation List .................................................... 41
                                                                                                                                                       .
 CAN Communication System .................................. 4      .         PRECAUTIONS ....................................................... 42   .        H
   SYSTEM DIAGRAM ............................................. 4   .           Precautions for Supplemental Restraint System
   CAN COMMUNICATION CONTROL CIRCUIT..... 5                                     (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
 Diag on CAN ........................................................... 6
                                                                    .           SIONER" ................................................................ 42
                                                                                                                                                       .         I
   DESCRIPTION ..................................................... 6
                                                                    .           Precautions When Using CONSULT-II .................. 42                .
   SYSTEM DIAGRAM ............................................. 6   .           Precautions for Trouble Diagnosis ........................ 42          .
TROUBLE DIAGNOSIS ............................................. 7   .           Precautions for Harness Repair ............................ 42         .         J
 Condition of Error Detection .................................... 7.         TROUBLE DIAGNOSIS ........................................... 44         .
   CAN COMMUNICATION SYSTEM ERROR ........ 7                        .           CAN Diagnostic Support Monitor ........................... 44          .
   WHEN INDICATED "U1000" OR "U1001" IS INDI-                                     MONITOR ITEM LIST (CONSULT-II) ................. 44                  .
   CATED EVEN THOUGH CAN COMMUNICA-                                             CAN System Specification Chart ........................... 47          .        LAN
   TION SYSTEM IS NORMAL ................................ 7         .             VEHICLE EQUIPMENT IDENTIFICATION
 Symptom When Error Occurs in CAN Communi-                                        INFORMATION ................................................... 47   .
 cation System .......................................................... 8
                                                                    .           CAN Communication Signal Chart ........................ 48             .         L
   ERROR EXAMPLE .............................................. 8   .             TYPE 1 ............................................................... 48
                                                                                                                                                       .
 Self-Diagnosis ....................................................... 12
                                                                    .             TYPE 2 ............................................................... 49
                                                                                                                                                       .
 CAN Diagnostic Support Monitor .......................... 13       .             TYPE 3/TYPE 4 .................................................. 50  .        M
   MONITOR ITEM (CONSULT-II) ......................... 13           .             TYPE 5/TYPE 6 .................................................. 51  .
   MONITOR ITEM (ON-BOARD DIAGNOSIS) ..... 14                       .           Schematic .............................................................. 54
                                                                                                                                                       .
TROUBLE DIAGNOSES WORK FLOW ................. 15                    .           Wiring Diagram -- CAN -- .................................... 55       .
 Information Needed for Trouble Diagnosis ............ 15           .           Interview Sheet ...................................................... 58
                                                                                                                                                       .
 How to Use CAN Communication Signal Chart .... 15                  .           Data Sheet ............................................................. 59
                                                                                                                                                       .
 Trouble Diagnosis Flow Chart ............................... 16    .             CONSULT-II DATA ATTACHMENT SHEET ....... 59                          .
 Trouble Diagnosis Procedure ................................ 17    .           CAN System (Type 1) ............................................ 62    .
   INTERVIEW WITH CUSTOMER ........................ 17              .             DIAGNOSIS SHEET .......................................... 62        .
   INSPECTION OF VEHICLE CONDITION .......... 18                    .           CAN System (Type 2) ............................................ 63    .
   CHECK OF CAN SYSTEM TYPE (HOW TO USE                                           DIAGNOSIS SHEET .......................................... 63        .
   CAN SYSTEM TYPE SPECIFICATION CHART) 19                          ...         CAN System (Type 3) ............................................ 64    .
   CREATE INTERVIEW SHEET ........................... 21            .             DIAGNOSIS SHEET .......................................... 64        .
   CREATE DATA SHEET ...................................... 22      .           CAN System (Type 4) ............................................ 65    .
   CREATE DIAGNOSIS SHEET ........................... 24            .             DIAGNOSIS SHEET .......................................... 65        .
   DETECT THE ROOT CAUSE ............................ 25            .           CAN System (Type 5) ............................................ 66    .
                                                                                  DIAGNOSIS SHEET .......................................... 66        .
                                                                                CAN System (Type 6) ............................................ 67    .

Revision: September 2006                                               LAN-1                                                                2007 Xterra
  DIAGNOSIS SHEET ........................................... 67   .        TCM Branch Line Circuit ........................................73     .
 Component Parts Location .................................... 68  .        Transfer Control Unit Branch Line Circuit ..............73             .
 Harness Layout ..................................................... 68
                                                                   .        BCM Branch Line Circuit ........................................74     .
 Malfunction Area Chart .......................................... 69
                                                                   .        Differential Lock Control Unit Branch Line Circuit ...75
  MAIN LINE .......................................................... 69
                                                                   .        Data Link Connector Branch Line Circuit ...............75              .
  BRANCH LINE ................................................... 69
                                                                   .        Combination Meter Branch Line Circuit .................76              .
  SHORT CIRCUIT ............................................... 69 .        Steering Angle Sensor Branch Line Circuit ............77               .
 Main Line Between TCM and Data Link Connector 70                  ...      ABS Actuator and Electric Unit (Control Unit) Branch
 Main Line Between Data Link Connector and ABS                              Line Circuit .............................................................77
                                                                                                                                                   .
 Actuator and Electric Unit ...................................... 71
                                                                   .        IPDM E/R Branch Line Circuit ................................78        .
 ECM Branch Line Circuit ....................................... 72.        CAN Communication Circuit ..................................79         .




Revision: September 2006                                             LAN-2                                                              2007 Xterra
                                          PRECAUTIONS
                                                                              [CAN FUNDAMENTAL]
PRECAUTIONS                                                                                      PFP:00001
                                                                                                                A
Precautions When Using CONSULT-II                                                                    UKS006FG


Use CONSULT-II CONVERTER when connecting CONSULT-II to data link connector.
CAUTION:                                                                                                        B
CAN communication does not function properly if CONSULT-II is used without connecting CONSULT-II
CONVERTER.
Precautions for Trouble Diagnosis                                                                    UKS006FH
                                                                                                                C

CAUTION:
G  Never apply 7.0 V or more to the measurement terminal.
                                                                                                                D
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.
                                                                                                                E
Precautions for Harness Repair                                                                       UKS006FI


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


                                                                                                                H


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



                                                                                                                 L
                                                                                                  SKIB8767E



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




Revision: September 2006                        LAN-3                                         2007 Xterra
                                        SYSTEM DESCRIPTION
                                                                                             [CAN FUNDAMENTAL]
SYSTEM DESCRIPTION                                                                                       PFP:00000

CAN Communication System                                                                                       UKS006FJ


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: September 2006                               LAN-4                                           2007 Xterra
                                              SYSTEM DESCRIPTION
                                                                                                   [CAN FUNDAMENTAL]
CAN COMMUNICATION CONTROL CIRCUIT
                                                                                                                                        A



                                                                                                                                        B



                                                                                                                                        C



                                                                                                                                        D



                                                                                                                                        E



                                                                                                                                        F

                                                                                                                            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



                                                                                                                                         L



                                                                                                                                        M




Revision: September 2006                                      LAN-5                                                    2007 Xterra
                                   SYSTEM DESCRIPTION
                                                                                        [CAN FUNDAMENTAL]
Diag on CAN                                                                                                          UKS006FK

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
                 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: September 2006                         LAN-6                                                      2007 Xterra
                                      TROUBLE DIAGNOSIS
                                                                               [CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS                                                                                  PFP:00004
                                                                                                                 A
Condition of Error Detection                                                                          UKS006FL


"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.                                                     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 INDICATED "U1000" OR "U1001" IS INDICATED EVEN THOUGH CAN COMMUNICA-                                        D
TION SYSTEM IS NORMAL
G  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).                     E
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
   detected.)
                                                                                                                 F
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
   switch ON (Depending on the control unit which carries out CAN communication).
                                                                                                                 G
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  Error may be detected if reprogramming is not completed normally.                                             H
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.
                                                                                                                  I


                                                                                                                  J



                                                                                                                 LAN



                                                                                                                  L



                                                                                                                 M




Revision: September 2006                         LAN-7                                           2007 Xterra
                                                 TROUBLE DIAGNOSIS
                                                                                                     [CAN FUNDAMENTAL]
Symptom When Error Occurs in CAN Communication System                                                                         UKS006FM


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-41, "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: September 2006                                       LAN-8                                                  2007 Xterra
                                                  TROUBLE DIAGNOSIS
                                                                                                      [CAN FUNDAMENTAL]
Example: Data link connector branch line open circuit
                                                                                                                                        A



                                                                                                                                        B



                                                                                                                                        C



                                                                                                                                        D



                                                                                                                                        E



                                                                                                                                        F

                                                                                                                           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
   is not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit.     LAN
G  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.
                                                                                                          L
                                                       SELECT SYSTEM
                                                                                                Difference of symptom
                                                         (CONSULT-II)
  Data link connector branch line open cir-                                                                                             M
                                                                                  Normal operation.
  cuit
                                                  All Diag on CAN units are not
                                                  indicated.                      Most the units which are connected to the CAN com-
  CAN-H, CAN-L harness short-circuit                                              munication system enter fail-safe mode or are deac-
                                                                                  tivated.




Revision: September 2006                                        LAN-9                                                    2007 Xterra
                                                 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: September 2006                                      LAN-10                                                  2007 Xterra
                                                 TROUBLE DIAGNOSIS
                                                                                                       [CAN FUNDAMENTAL]
Example: CAN-H, CAN-L Harness Short Circuit
                                                                                                                                             A



                                                                                                                                             B



                                                                                                                                             C



                                                                                                                                             D



                                                                                                                                             E



                                                                                                                                             F

                                                                                                                              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 is OFF.)
                                                  G   The steering lock does not release (if an error or malfunction occurs while turning     J
                                                      the ignition switch is 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: September 2006                                      LAN-11                                                        2007 Xterra
                                         TROUBLE DIAGNOSIS
                                                                                          [CAN FUNDAMENTAL]
Self-Diagnosis                                                                                                            UKS006FN


                     Self-diagnosis item
      DTC                                                DTC detection condition                      Inspection/Action
                   (CONSULT-II 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: September 2006                         LAN-12                                                         2007 Xterra
                                     TROUBLE DIAGNOSIS
                                                                                           [CAN FUNDAMENTAL]
CAN Diagnostic Support Monitor                                                                                             UKS006FO

                                                                                                                                      A
CONSULT-II and CAN diagnostic support monitor (on-board diagnosis function) are used for detecting root
cause.
MONITOR ITEM (CONSULT-II)                                                                                                             B
                           Example: CAN DIAG SUPPORT MNTR indication

                                                                                                                                      C



                                                                                                                                      D



                                                                                                                                      E



                                                                                                                                      F



                                                                                                                                      G


                                                                                                                                      H
                                                                                                                   SKIB8742E


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

     Control unit name             Unable to receive signals for 2 seconds or more.
                                                                                                                                       L
   (Reception diagnosis)   UNKWN   Diagnosis not performed
                                   No control unit for receiving signals. (No applicable optional parts)

With PAST                                                                                                                             M

           Item            PRSNT      PAST                                         Description
                                        OK         Normal at present and in the past

                            OK                     Normal at present, but unable to transmit signals for 2 seconds or more
  Transmission diagnosis              1 



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