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LAN


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LAN SYSTEM


K ELECTRICAL

                                                                                                                                                                A




                                                                                SECTION                    LAN    LAN SYSTEM
                                                                                                                                                                B



                                                                                                                                                                C


                                                                                                                                                                D


                                                                                                                                                                E
                                                              CONTENTS
                   CAN FUNDAMENTAL                                                                               CAN                                            F

PRECAUTIONS ......................................................... 3
                                                                    .         INDEX FOR DTC ...................................................... 40  .
 Precautions for Trouble Diagnosis .......................... 3     .           DTC No. Index ....................................................... 40
                                                                                                                                                       .
                                                                                                                                                                G
 Precautions for Harness Repair .............................. 3    .         HOW TO USE THIS SECTION ................................ 41              .
SYSTEM DESCRIPTION ........................................... 4    .           Caution .................................................................. 41
                                                                                                                                                       .
 CAN Communication System .................................. 4      .           Abbreviation List .................................................... 41
                                                                                                                                                       .
   SYSTEM DIAGRAM ............................................. 4   .         PRECAUTIONS ....................................................... 42   .        H
   CAN COMMUNICATION CONTROL CIRCUIT..... 5                                     Precautions for Supplemental Restraint System
 Diag on CAN ........................................................... 6
                                                                    .           (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
   DESCRIPTION ..................................................... 6
                                                                    .           SIONER" ................................................................ 42
                                                                                                                                                       .         I
   SYSTEM DIAGRAM ............................................. 6   .           Precautions for Battery Service ............................. 42       .
TROUBLE DIAGNOSIS ............................................. 7   .           Precautions for Trouble Diagnosis ........................ 42          .
 Condition of Error Detection .................................... 7.           Precautions for Harness Repair ............................ 42         .         J
   CAN COMMUNICATION SYSTEM ERROR ........ 7                        .         TROUBLE DIAGNOSIS ........................................... 44         .
   WHEN INDICATED "U1000" OR "U1001" IS INDI-                                   CAN Diagnostic Support Monitor ........................... 44          .
   CATED EVEN THOUGH CAN COMMUNICA-                                               MONITOR ITEM LIST (CONSULT-III) ................ 44                  .
   TION SYSTEM IS NORMAL ................................ 7         .           CAN System Specification Chart ........................... 48          .        LAN
 Symptom When Error Occurs in CAN Communi-                                        VEHICLE EQUIPMENT IDENTIFICATION
 cation System .......................................................... 8
                                                                    .             INFORMATION ................................................... 48   .
   ERROR EXAMPLE .............................................. 8   .           CAN Communication Signal Chart ........................ 49             .         L
 Self-Diagnosis ....................................................... 12
                                                                    .             TYPE 1 ............................................................... 49
                                                                                                                                                       .
 CAN Diagnostic Support Monitor .......................... 13       .             TYPE 2/TYPE 3 .................................................. 50  .
   MONITOR ITEM (CONSULT-III) ........................ 13           .             TYPE 4/TYPE 5 .................................................. 51  .        M
   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                  .           CAN System (Type 1) ............................................ 59    .
 Trouble Diagnosis Flow Chart ............................... 16    .             DIAGNOSIS SHEET .......................................... 59        .
 Trouble Diagnosis Procedure ................................ 17    .           CAN System (Type 2) ............................................ 60    .
   INTERVIEW WITH CUSTOMER ........................ 17              .             DIAGNOSIS SHEET .......................................... 60        .
   INSPECTION OF VEHICLE CONDITION .......... 18                    .           CAN System (Type 3) ............................................ 61    .
   CHECK OF CAN SYSTEM TYPE (HOW TO USE                                           DIAGNOSIS SHEET .......................................... 61        .
   CAN SYSTEM TYPE SPECIFICATION CHART) 19                          ...         CAN System (Type 4) ............................................ 62    .
   CREATE INTERVIEW SHEET ........................... 21            .             DIAGNOSIS SHEET .......................................... 62        .
   COLLECT DATA ................................................ 22 .           CAN System (Type 5) ............................................ 63    .
   CREATE DIAGNOSIS SHEET ........................... 24            .             DIAGNOSIS SHEET .......................................... 63        .
   DETECT THE ROOT CAUSE ............................ 25            .           Component Parts Location .................................... 64       .
                                                                                Harness Layout ..................................................... 64.
                                                                                Malfunction Area Chart .......................................... 65   .
                                                                                  MAIN LINE ......................................................... 65
                                                                                                                                                       .

Revision: 2006 November                                                LAN-1                                                                  2007 350Z
   BRANCH LINE ................................................... 65
                                                                .        TCM Branch Line Circuit ........................................69     .
   SHORT CIRCUIT ............................................... 65
                                                                .        BCM Branch Line Circuit ........................................70     .
 Main Line Between VDC/TCS/ABS Control Unit and                          Data Link Connector Branch Line Circuit ...............71              .
 Data Link Connector .............................................. 66
                                                                .        Unified Meter and A/C Amp. Branch Line Circuit ...71
 Main Line Between TCM and Data Link Connector 66               ...      Steering Angle Sensor Branch Line Circuit ............72               .
 Main Line Between Data Link Connector and ABS                           ABS Actuator and Electric Unit (Control Unit) Branch
 Actuator and Electric Unit (Control Unit) ................ 67  .        Line Circuit .............................................................72
                                                                                                                                                .
 ECM Branch Line Circuit ....................................... 68
                                                                .        IPDM E/R Branch Line Circuit ................................73        .
 Air Bag Diagnosis Sensor Unit Branch Line Circuit 68           ...      CAN Communication Circuit ..................................74         .
 VDC/TCS/ABS Control Unit Branch Line Circuit ... 69




Revision: 2006 November                                            LAN-2                                                              2007 350Z
                                         PRECAUTIONS
                                                                             [CAN FUNDAMENTAL]
PRECAUTIONS
[CAN FUNDAMENTAL]                                                                               PFP:00001
                                                                                                               A
Precautions for Trouble Diagnosis                                                                   NKS004PA


CAUTION:
q  Never apply 7.0 V or more to the measurement terminal.                                                      B
q  Use a tester with open terminal voltage of 7.0 V or less.
q  Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when
   checking the harness.                                                                                       C
Precautions for Harness Repair                                                                      NKS004PB


q   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



                                                                                                               F


                                                                                                 SKIB8766E
                                                                                                               G
q   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


                                                                                                               J

                                                                                                 SKIB8767E



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

                                                                                                               L



                                                                                                               M




Revision: 2006 November                        LAN-3                                          2007 350Z
                                        SYSTEM DESCRIPTION
                                                                                             [CAN FUNDAMENTAL]
SYSTEM DESCRIPTION                                                                                       PFP:00000

CAN Communication System                                                                                      NKS004PC


q     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).
q     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.
q     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: 2006 November                                LAN-4                                           2007 350Z
                                              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*                                                                                                                    I
                                   It produces potential difference.
 (Resistance of approx. 120 )
*: These are the only control units wired with both ends of CAN communication system.
                                                                                                                                         J


                                                                                                                                        LAN


                                                                                                                                         L



                                                                                                                                        M




Revision: 2006 November                                       LAN-5                                                         2007 350Z
                                    SYSTEM DESCRIPTION
                                                                                         [CAN FUNDAMENTAL]
Diag on CAN                                                                                                          NKS004PD

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: 2006 November                           LAN-6                                                       2007 350Z
                                      TROUBLE DIAGNOSIS
                                                                               [CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS                                                                                 PFP:00004
                                                                                                                A
Condition of Error Detection                                                                         NKS004PE


"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
q   CAN communication line open (CAN-H, CAN-L, or both)
                                                                                                                C
q   CAN communication line short (ground, between CAN communication lines, other harnesses)
q   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
q  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.)
q  Fuse blown out (removed): CAN communication of the unit may cease.
q  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).
q  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
q  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.


                                                                                                                 I


                                                                                                                 J


                                                                                                                LAN


                                                                                                                 L



                                                                                                                M




Revision: 2006 November                          LAN-7                                           2007 350Z
                                                 TROUBLE DIAGNOSIS
                                                                                                     [CAN FUNDAMENTAL]
Symptom When Error Occurs in CAN Communication System                                                                        NKS004PF


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:
q  Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring.
q  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.
                                                 q   Shift position indicator and OD OFF indicator turn OFF.
 Combination meter
                                                 q   Warning lamps turn ON.
 ABS actuator and electric unit (control unit)   Normal operation.
 TCM                                             No impact on operation.
 IPDM E/R                                        Normal operation.




Revision: 2006 November                                        LAN-8                                                  2007 350Z
                                                 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:
q  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
q  When data link connector branch line is open, "ECU list" displayed on the CONSULT-III "CAN DIAG SUP-
   PORT MNTR" may be the same as when the CAN communication line has short-circuit. However, symp-
   toms differ depending on the case. See below chart for the differences.
                                                                                                          L
                                                 "ECU list" on the "CAN DIAG
                                                     SUPPORT MNTR"                             Difference of symptom
                                                        (CONSULT-III)
                                                                                                                                       M
  Data link connector branch line open cir-
                                                                                 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: 2006 November                                        LAN-9                                                     2007 350Z
                                                 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.
                                                 q   Reverse warning chime does not sound.
 BCM                                             q   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.
                                                 q   The shift position indicator and OD OFF indicator turn OFF.
 Combination meter                               q   The speedometer is inoperative.
                                                 q   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                                        q   The headlamps (Lo) turn ON.
                                                 q   The cooling fan continues to rotate.




Revision: 2006 November                                       LAN-10                                                   2007 350Z
                                                 TROUBLE DIAGNOSIS
                                                                                                      [CAN FUNDAMENTAL]
Example: CAN-H, CAN-L Harness Short Circuit
                                                                                                                                             A


                                                                                                                                             B



                                                                                                                                             C


                                                                                                                                             D


                                                                                                                                             E



                                                                                                                                             F

                                                                                                                              SKIB8741E


                    Unit name                                                            Symptom                                             G
                                                  q   Engine torque limiting is affected, and shift harshness increases.
 ECM
                                                  q   Engine speed drops.
                                                                                                                                             H
                                                  q   Reverse warning chime does not sound.
                                                  q   The front wiper moves under continuous operation mode even though the front
                                                      wiper switch being in the intermittent position.
                                                                                                                                              I
                                                  q   The room lamp does not turn ON.
 BCM
                                                  q   The engine does not start (if an error or malfunction occurs while turning the igni-
                                                      tion switch is OFF.)
                                                                                                                                              J
                                                  q   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.
                                                                                                                                             LAN
                                                  q   The tachometer and the speedometer do not move.
 Combination meter                                q   Warning lamps turn ON.
                                                  q   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                                         q   The headlamps (Lo) turn ON.
                                                  q   The cooling fan continues to rotate.




Revision: 2006 November                                       LAN-11                                                         2007 350Z
                                        TROUBLE DIAGNOSIS
                                                                                          [CAN FUNDAMENTAL]
Self-Diagnosis                                                                                                            NKS004PG


                    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: 2006 November                          LAN-12                                                           2007 350Z
                                     TROUBLE DIAGNOSIS
                                                                                           [CAN FUNDAMENTAL]
CAN Diagnostic Support Monitor                                                                                             NKS004PH

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

                                                                                                                                      C


                                                                                                                                      D


                                                                                                                                      E



                                                                                                                                      F


                                                                                                                                      G


                                                                                                                                      H
                                                                                                                   PKID1075E


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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