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BRC


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F BRAKES

                                                                                                                                                                  A




                                                                               SECTION
                                                                         BRAKE CONTROL SYSTEM
                                                                                                          BRC                                                     B



                                                                                                                                                                  C



                                                                                                                                                                  D



                                                                                                                                                                  E
                                                               CONTENTS
                         VDC/TCS/ABS                                               AND BATTERY INSPECTION ............................ 24                .        BRC
                                                                                   ABS WARNING LAMP, SLIP INDICATOR LAMP
PRECAUTIONS ......................................................... 4
                                                                     .             AND VDC OFF INDICATOR LAMP INSPECTION 24                              ...
 Precautions for Supplemental Restraint System                                   For Fast and Accurate Diagnosis .......................... 25           .        G
 (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                           PRECAUTIONS FOR DIAGNOSIS .................... 25                     .
 SIONER" ................................................................. 4
                                                                     .           Warning Lamp and Indicator Timing ...................... 26             .
 Precautions for Brake System ................................. 4    .           Control Unit Input/Output Signal Standard ............ 26               .
 Precautions When Using CONSULT-II .................... 4            .                                                                                            H
                                                                                   REFERENCE VALUE FROM CONSULT-II ........ 26                           .
   CHECK POINTS FOR USING CONSULT-II ........ 4                      .           CONSULT-II Function (ABS) ................................. 29          .
 Precautions for Brake Control ................................. 5   .             CONSULT-II BASIC OPERATION PROCEDURE
 Precautions for CAN System .................................. 6     .                                                                                   ... 29    I
 Wiring Diagrams and Trouble Diagnosis ................. 6           .             SELF-DIAGNOSIS ............................................. 30       .
PREPARATION .......................................................... 7
                                                                     .             DATA MONITOR ................................................ 33      .
 Special Service Tool ................................................ 7
                                                                     .             ACTIVE TEST .................................................... 36   .        J
 Commercial Service Tools ....................................... 7  .         TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
SYSTEM DESCRIPTION ........................................... 8     .         ITEMS ....................................................................... 38
                                                                                                                                                         .
 System Components ............................................... 8 .           Wheel Sensor System Inspection .......................... 38            .
 ABS Function .......................................................... 9
                                                                     .                                                                                            K
                                                                                 Engine System Inspection ..................................... 39       .
 EBD Function .......................................................... 9
                                                                     .           ABS/TCS/VDC Control Unit Inspection ................. 40                .
 TCS Function .......................................................... 9
                                                                     .           Steering Angle Sensor System .............................. 40          .
 VDC Function .......................................................... 9
                                                                     .           Yaw Rate/Side/Decel G Sensor System Inspection 42                       ...      L
 Fail-Safe Function ................................................... 9
                                                                     .           Solenoid and VDC Change-Over Valve System
   ABS/EBD SYSTEM ............................................ 10    .           Inspection .............................................................. 44
                                                                                                                                                         .
   VDC/TCS SYSTEM ............................................ 10    .           Actuator Motor, Motor Relay, and Circuit Inspection 45                  ...      M
 Hydraulic Circuit Diagram ..................................... 10  .           Stop Lamp Switch System Inspection ................... 46               .
CAN COMMUNICATION ..........................................11       .           ABS/TCS/VDC Control Unit Power and Ground
 System Description ................................................11
                                                                     .           Systems Inspection ............................................... 47   .
TROUBLE DIAGNOSIS ........................................... 12     .           Brake Fluid Level Switch System Inspection ......... 48                 .
 How to Perform Trouble Diagnoses for Quick and                                  Pressure Sensor System Inspection ..................... 49              .
 Accurate Repair .................................................... 12
                                                                     .           Steering Angle Sensor Safe Mode Inspection ....... 50                   .
   INTRODUCTION ................................................ 12  .           CAN Communication System Inspection ............... 51                  .
   WORK FLOW ..................................................... 13.           Inspection For Self-diagnosis Result "ST ANGLE
   CLARIFY CONCERN ......................................... 14      .           SEN SIGNAL" ........................................................ 51 .
   EXAMPLE OF DIAGNOSIS SHEET .................. 14                  .           Inspection For Self-diagnosis Result "DECEL G
 Component Parts and Harness Connector Location 15                   ...         SEN SET" .............................................................. 51
                                                                                                                                                         .
 Schematic ............................................................. 16
                                                                     .           VDC OFF Indicator lamp Does Not Illuminate ....... 52                   .
 Wiring Diagram -- VDC -- .................................... 17    .           Component Inspection ........................................... 52     .
 Basic Inspection .................................................... 24
                                                                     .             VDC OFF SWITCH ............................................ 52        .
   BRAKE FLUID LEVEL, FLUID LEAK, AND                                          TROUBLE DIAGNOSES FOR SYMPTOMS ........... 53                             .
   BRAKE PAD INSPECTION ................................ 24          .           ABS Works Frequently .......................................... 53      .
   POWER SYSTEM TERMINAL LOOSENESS

Revision: November 2005                                                 BRC-1                                                           2005 Pathfinder
 Unexpected Pedal Action ...................................... 54          .            ABS/EBD SYSTEM .............................................72        .
 Long Stopping Distance ......................................... 55        .            HDC/HSA SYSTEM ............................................72         .
 ABS Does Not Work .............................................. 55        .            VDC/TCS SYSTEM ............................................72         .
 Pedal Vibration or ABS Operation Noise ............... 55                  .          Hydraulic Circuit Diagram ......................................73      .
 ABS Warning Lamp Does Not Come On When Igni-                                        CAN COMMUNICATION ..........................................74            .
 tion Switch Is Turned On ....................................... 56        .          System Description ................................................74   .
 ABS Warning Lamp Stays On When Ignition Switch                                      TROUBLE DIAGNOSIS ...........................................75           .
 Is Turned On .......................................................... 56 .          How to Perform Trouble Diagnoses for Quick and
 Vehicle Jerks During TCS/VDC Activation ............. 57                   .          Accurate Repair .....................................................75 .
ON-VEHICLE SERVICE ........................................... 58           .            INTRODUCTION ................................................75       .
 Adjustment of Steering Angle Sensor Neutral Posi-                                       WORK FLOW .....................................................76     .
 tion ......................................................................... 58
                                                                            .            CLARIFY CONCERN ..........................................77          .
    WITH CONSULT-II ............................................. 58        .            EXAMPLE OF DIAGNOSIS SHEET ...................77                      .
    WITHOUT CONSULT-II ...................................... 58            .          Component Parts and Harness Connector Location                          ...78
 Calibration of Decel G Sensor ............................... 58           .          Schematic ..............................................................79
                                                                                                                                                               .
WHEEL SENSORS .................................................. 60         .          Wiring Diagram -- VDC -- ....................................80         .
 Removal and Installation ....................................... 60        .          Basic Inspection .....................................................87.
    REMOVAL .......................................................... 60   .            BRAKE FLUID LEVEL, FLUID LEAK, AND
    INSTALLATION ................................................... 60     .            BRAKE PAD INSPECTION .................................87              .
SENSOR ROTOR ..................................................... 61       .            POWER SYSTEM TERMINAL LOOSENESS
 Removal and Installation ....................................... 61        .            AND BATTERY INSPECTION ............................87                 .
    FRONT ............................................................... 61.            ABS WARNING LAMP, SLIP INDICATOR LAMP,
    REAR .................................................................. 61
                                                                            .            VDC OFF INDICATOR LAMP AND HDC INDI-
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) ... 62                                             CATOR LAMP INSPECTION ..............................87                .
 Removal and Installation ....................................... 62        .          For Fast and Accurate Diagnosis ...........................88           .
    REMOVAL .......................................................... 62   .            PRECAUTIONS FOR DIAGNOSIS ....................88                      .
    INSTALLATION ................................................... 63     .          Warning Lamp and Indicator Timing ......................89              .
STEERING ANGLE SENSOR .................................. 64                 .          Control Unit Input/Output Signal Standard .............89               .
 Removal and Installation ....................................... 64        .            REFERENCE VALUE FROM CONSULT-II .........89                           .
G SENSOR ............................................................... 65 .          CONSULT-II Function (ABS) ..................................93          .
 Removal and Installation ....................................... 65        .            CONSULT-II BASIC OPERATION PROCEDURE
    REMOVAL .......................................................... 65   .                                                                                  ...93
    INSTALLATION ................................................... 65     .            SELF-DIAGNOSIS ..............................................94       .
                                                                                         DATA MONITOR .................................................97      .
                 HDC/HSA/VDC/TCS/ABS                                                     ACTIVE TEST ................................................... 100   .
                                                                                     TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
PRECAUTIONS ........................................................ 66
                                                                      .              ITEMS ..................................................................... 103
                                                                                                                                                               .
 Precautions for Supplemental Restraint System                                         Wheel Sensor System Inspection ........................ 103             .
 (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                               Engine System Inspection ................................... 104        .
 SIONER" ................................................................ 66
                                                                      .                ABS/TCS/VDC Control Unit Inspection ................ 105                .
 Precautions for Brake System ............................... 66      .                Steering Angle Sensor System ............................ 105           .
 Precautions When Using CONSULT-II .................. 66              .                Yaw Rate/Side/Decel G Sensor System Inspection.107
   CHECK POINTS FOR USING CONSULT-II ....... 66                       .                Solenoid and VDC Change-Over Valve System
 Precautions for Brake Control ............................... 67     .                Inspection ............................................................. 109
                                                                                                                                                               .
 Precautions for CAN System ................................. 68      .                Actuator Motor, Motor Relay, and Circuit Inspection. 110
 Wiring Diagrams and Trouble Diagnosis ............... 68             .                Stop Lamp Switch System Inspection .................. 111               .
PREPARATION ........................................................ 69
                                                                      .                ABS/TCS/VDC Control Unit Power and Ground
 Special Service Tool .............................................. 69
                                                                      .                Systems Inspection .............................................. 112   .
 Commercial Service Tools ..................................... 69    .                Brake Fluid Level Switch System Inspection ....... 113                  .
SYSTEM DESCRIPTION ......................................... 70       .                Active Booster System Inspection ....................... 114            .
 System Components ............................................. 70   .                Pressure Sensor System Inspection .................... 115              .
 ABS Function ......................................................... 71
                                                                      .                Steering Angle Sensor Safe Mode Inspection ..... 118                    .
 EBD Function ........................................................ 71
                                                                      .                CAN Communication System Inspection ............. 118                   .
 TCS Function ......................................................... 71
                                                                      .                Inspection For Self-diagnosis Result "ST ANGLE
 VDC Function ........................................................ 71
                                                                      .                SEN SIGNAL" ...................................................... 119  .
 HDC Function ........................................................ 71
                                                                      .                Inspection For Self-diagnosis Result "DECEL G
 HSA Function ........................................................ 72
                                                                      .                SEN SET" ............................................................ 119
                                                                                                                                                               .
 Fail-Safe Function ................................................. 72
                                                                      .


Revision: November 2005                                                       BRC-2                                                           2005 Pathfinder
 VDC OFF Indicator lamp Does Not Illuminate .....119                       .          WITHOUT CONSULT-II .................................... 128        .
 Component Inspection ........................................ 120         .        Calibration of Decel G Sensor ............................. 128      .       A
    VDC OFF SWITCH .......................................... 120          .       WHEEL SENSORS ................................................ 130    .
    HDS SWITCH .................................................. 120      .        Removal and Installation ..................................... 130   .
TROUBLE DIAGNOSES FOR SYMPTOMS ......... 121                               .          REMOVAL ........................................................ 130
                                                                                                                                                         .       B
 ABS Works Frequently ........................................ 121         .          INSTALLATION ................................................ 130  .
 Unexpected Pedal Action .................................... 122          .       SENSOR ROTOR .................................................. 131   .
 Long Stopping Distance ...................................... 123         .        Removal and Installation ..................................... 131   .
 ABS Does Not Work ............................................ 123        .          FRONT ............................................................. 131
                                                                                                                                                         .       C
 Pedal Vibration or ABS Operation Noise ............ 123                   .          REAR ............................................................... 131
                                                                                                                                                         .
 ABS Warning Lamp Does Not Come On When Igni-                                      ACTUATOR AND ELECTRIC UNIT (ASSEMBLY). 132
 tion Switch Is Turned On ..................................... 124        .        Removal and Installation ..................................... 132   .       D
 ABS Warning Lamp Stays On When Ignition Switch                                       REMOVAL ........................................................ 132
                                                                                                                                                         .
 Is Turned On ....................................................... 124  .          INSTALLATION ................................................ 133  .
 Vehicle Jerks During TCS/VDC Activation .......... 125                    .       STEERING ANGLE SENSOR ............................... 134             .       E
 Stop Lamp Relay Inspection ............................... 126            .        Removal and Installation ..................................... 134   .
 HDC Switch Inspection ....................................... 126         .       G SENSOR ............................................................. 135
                                                                                                                                                         .
ON-VEHICLE SERVICE ........................................ 128            .        Removal and Installation ..................................... 135   .
 Adjustment of Steering Angle Sensor Neutral Posi-                                    REMOVAL ........................................................ 135
                                                                                                                                                         .       BRC
 tion ...................................................................... 128
                                                                           .          INSTALLATION ................................................ 135  .
    WITH CONSULT-II ........................................... 128        .
                                                                                                                                                                 G


                                                                                                                                                                 H



                                                                                                                                                                  I


                                                                                                                                                                 J



                                                                                                                                                                 K


                                                                                                                                                                 L



                                                                                                                                                                 M




Revision: November 2005                                                     BRC-3                                                       2005 Pathfinder
                                              PRECAUTIONS
                                                                                               [VDC/TCS/ABS]
PRECAUTIONS                                                         PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER"                                                                                           EFS0062C


The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
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. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:
G    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.
G    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.
G    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.
Precautions for Brake System                                                                                  EFS004MG


CAUTION:
G  Refer to MA-11, "RECOMMENDED FLUIDS AND LUBRICANTS" for recommended brake fluid.
G  Never reuse drained brake fluid.
G  Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is
   splashed on painted areas, wash it away with water immediately.
G  To clean or wash all parts of master cylinder and disc brake caliper, use clean brake fluid.
G  Never use mineral oils such as gasoline or kerosene. They will ruin rubber parts of the hydraulic
   system.
G  Use flare nut wrench when removing and installing brake
   tube.
G  If a brake fluid leak is found, the part must be disassembled
   without fail. Then it has to be replaced with a new one if a
   defect exists.
G  Turn the ignition switch OFF and remove the connector of
   the ABS actuator and electric unit (control unit) or the bat-
   tery terminal before performing the work.
G  Always torque brake lines when installing.
G  Burnish the brake contact surfaces after refinishing or                                      SBR686C
   replacing rotors, after replacing pads, or if a soft pedal
   occurs at very low mileage.
   Refer to BR-29, "BRAKE BURNISHING PROCEDURE" (front disc brake) or BR-34, "BRAKE BUR-
   NISHING PROCEDURE" (rear disc brake).
WARNING:
G  Clean brake pads and shoes with a waste cloth, then wipe with a dust collector.
Precautions When Using CONSULT-II                                                                             EFS004MH


When connecting CONSULT-II to data link connector, connect them through CONSULT-II CONVERTER.
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
CHECK POINTS FOR USING CONSULT-II
1.   Has CONSULT-II been used without connecting CONSULT-II CONVERTER on this vehicle?
     G If YES, GO TO 2.

Revision: November 2005                              BRC-4                                         2005 Pathfinder
                                            PRECAUTIONS
                                                                                          [VDC/TCS/ABS]
     G  If NO, GO TO 5.
2.   Is there any indication other than indications relating to CAN communication system in the self-diagnosis      A
     results?
     G If YES, GO TO 3.

     G If NO, GO TO 4.                                                                                              B
3.   Based on self-diagnosis results unrelated to CAN communication, carry out the inspection.
4.   Malfunctions may be detected in self-diagnosis depending on control units carrying out CAN communica-
     tion. Therefor, erase the self-diagnosis results.                                                              C
5.   Diagnose CAN communication system. Refer to LAN-24, "CAN COMMUNICATION" .
Precautions for Brake Control                                                                            EFS004MI   D
G    During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
     normal.
G    Just after starting vehicle, the brake pedal may vibrate or a motor operating noise may be heard from E
     engine compartment. This is a normal status of operation check.
G    Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
     or snow-covered (fresh, deep snow) roads.                                                                    BRC
G    When an error is indicated by ABS or another warning lamp, collect all necessary information from cus-
     tomer (what symptoms are present under what conditions) and check for simple causes before starting
     diagnosis. Besides electrical system inspection, check brake booster operation, brake fluid level, and fluid G
     leaks.
G    If incorrect tire sizes or types are installed on the vehicle or brake pads are not Genuine NISSAN parts,
     stopping distance or steering stability may deteriorate.                                                      H
G    If there is a radio, antenna or related wiring near control module, ABS function may have a malfunction or
     error.
G    If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness   I
     pinches, open circuits or improper wiring.
G    If the following components are replaced with non-genuine components or modified, the VDC OFF indica-
     tor lamp and SLIP indicator lamp may turn on or the VDC system may not operate properly. Components
                                                                                                                   J
     related to suspension (shock absorbers, struts, springs, bushings, etc.), tires, wheels (exclude specified
     size), components related to brake system (pads, rotors, calipers, etc.), components related to engine
     (muffler, ECM, etc.), components related to body reinforcement (roll bar, tower bar, etc.).
G    Driving with broken or excessively worn suspension components, tires or brake system components may K
     cause the VDC OFF indicator lamp and the SLIP indicator lamp to turn on, and the VDC system may not
     operate properly.
G    When the TCS or VDC is activated by sudden acceleration or sudden turn, some noise may occur. The L
     noise is a result of the normal operation of the TCS and VDC.
G    When driving on roads which have extreme slopes (such as mountainous roads) or high banks (such as
     sharp curves on a freeway), the VDC may not operate normally, or the VDC warning lamp and the SLIP M
     indicator lamp may turn on. This is not a problem if normal operation can be resumed after restarting the
     engine.
G    Sudden turns (such as spin turns, acceleration turns), drifting, etc. with VDC turned off may cause the yaw
     rate/side G sensor to indicate a problem. This is not a problem if normal operation can be resumed after
     restarting the engine.
G    If battery is removed or steering angle sensor is disconnected, power to steering angle sensor is lost and
     the screen goes into steering angle sensor safe mode.
G    When screen goes into steering angle sensor safe mode, perform "Adjustment of Steering Angle Sensor
     Neutral Position" with CONSUT-II and check that VDC OFF indicator turns off. Additionally, perform self-
     diagnosis, check that only "Steering Angle Sensor Safe Mode" is shown for self-diagnostic result, and
     then delete the memory. (If the self-diagnostic result shows an indication other than "Steering Angle Sen-
     sor Safe Mode", repair the relevant part and restart self-diagnosis.) The steering angle sensor is released
     and returns to normal condition by performing the above operation.
G    When checking, if only "Steering Angle Sensor Safe Mode" is shown in the self-diagnostic result and VDC
     OFF indicator is off, delete history of malfunction. This happens when battery power supply is lost and the
     screen goes into Steering Angle Sensor Safe Mode, and then screen returns to normal mode automati-


Revision: November 2005                            BRC-5                                       2005 Pathfinder
                                            PRECAUTIONS
                                                                                        [VDC/TCS/ABS]
   cally by driving the vehicle in a straight forward direction [for approximately 30 seconds at 20 km/h (12
   MPH) or more] after power is supplied again.
NOTE:
VDC OFF indicator lamp is on when VDC OFF switch is on.
Precautions for CAN System                                                                             EFS004MJ


G   Do not apply voltage of 7.0V or higher to terminal to be measured.
G   Maximum open terminal voltage of tester in use must be less than 7.0V.
G   Before checking harnesses, turn ignition switch OFF and disconnect battery negative cable.
G   Area to be repaired must be soldered and wrapped with tape.
    Make sure that fraying of twisted wire is within 110 mm (4.33 in).




                                                                                                    PKIA0306E




G   Do not make a bypass connection to repaired area. (If the circuit
    is bypassed, characteristics of twisted wire will be lost.)




                                                                                                    PKIA0307E


Wiring Diagrams and Trouble Diagnosis                                                                  EFS004MK


When you read wiring diagrams, refer to the following:
G  GI-15, "How to Read Wiring Diagrams".
G  PG-4, "POWER SUPPLY ROUTING CIRCUIT".
When you perform trouble diagnosis, refer to the following:
G  GI-11, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES".
G  GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident".




Revision: November 2005                           BRC-6                                      2005 Pathfinder
                                            PREPARATION
                                                                                                 [VDC/TCS/ABS]
PREPARATION                                                                                                   PFP:00002
                                                                                                                            A
Special Service Tool                                                                                             EFS004ML


The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
    Tool number                                                         Description                                         B
    (Kent-Moore No.)
    Tool name
        --                                                              Checking operation of ABS active wheel              C
    (J-45741)                                                           sensors
    ABS active wheel sensor tester

                                                                                                                            D


                                                           WFIA0101E
                                                                                                                            E
    205-D002                                                            Removing sensor rotor
    ( -- )
    Bearing replacer
                                                                                                                            BRC



                                                           ZZA0700D                                                         G
    ST30720000                                                          Installing rear sensor rotor
    (J-25405)                                                           a: 77 mm (0.03 in) dia.
    Drift                                                               b: 55 mm (2.17 in) dia.                             H



                                                                                                                             I
                                                           ZZA0701D


    ST27863000                                                          Installing rear sensor rotor
    (--)                                                                a: 75 mm (2.95 in) dia.                             J
    Drift                                                               b: 62 mm (2.44 in) dia.


                                                                                                                            K
                                                           ZZA0832D


    KV40104710                                                          Installing rear sensor rotor
                                                                                                                            L
    (--)                                                                a: 76 mm (2.99 in) dia.
    Drift                                                               b: 68.5 mm (2.697 in) dia.

                                                                                                                            M

                                                           ZZA0832D



Commercial Service Tools                                                                                         EFS004MM


   Tool name                                                           Description
   1. Flare nut crowfoot                                               Removing and installing brake piping
   2. Torque wrench                                                    a: 10 mm (0.39 in)/12 mm (0.47 in)




                                                           S-NT360




Revision: November 2005                            BRC-7                                               2005 Pathfinder
                          SYSTEM DESCRIPTION
                                               [VDC/TCS/ABS]
SYSTEM DESCRIPTION                                     PFP:00000

System Components                                           EFS004MN




                                                      WFIA0356E




Revision: November 2005         BRC-8            2005 Pathfinder
                                       SYSTEM DESCRIPTION
                                                                                            [VDC/TCS/ABS]
ABS Function                                                                                               EFS004MO

                                                                                                                      A
G   The Anti-Lock Brake System detects wheel revolution while braking and improves handling stability during
    sudden braking by electrically preventing wheel lockup. Maneuverability is also improved for avoiding
    obstacles.
G   If the electrical system malfunctions, the Fail-Safe function is activated, the ABS becomes inoperative and       B
    the ABS warning lamp turns on.
G   The electrical system can be diagnosed using CONSULT-II.
                                                                                                                      C
G   During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
    normal.
G   Just after starting the vehicle, the brake pedal may vibrate or a motor operating noise may be heard from
    engine compartment. This is a normal status of operation check.                                                   D
G   Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
    or snow-covered (fresh, deep snow) roads.
                                                                                                                      E
EBD Function                                                                                               EFS004MP


G   Electronic Brake Distribution is a function that detects subtle slippages between the front and rear wheels
    during braking, and it improves handling stability by electronically controlling the brake fluid pressure BRC
    which results in reduced rear wheel slippage.
G   If the electrical system malfunctions, the Fail-Safe function is activated, the EBD and ABS become inoper-
    ative, and the ABS warning lamp and brake warning lamp are turned on.                                       G
G   The electrical system can be diagnosed using CONSULT-II.
G   During EBD operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
    normal.                                                                                                     H
G   Just after starting the vehicle, the brake pedal may vibrate or a motor operating noise may be heard from
    engine compartment. This is a normal status of operation check.
TCS Function                                                                                               EFS004MQ   I
G   Spinning of the drive wheels is detected by the ABS actuator and electric unit (control unit) using inputs
    from the wheel speed sensors. If wheel spin occurs, the drive wheel right and left brake fluid pressure
    control and engine fuel cut are activated while the throttle value is restricted to reduce the engine torque      J
    and decrease the amount of wheel spin. In addition, the throttle opening is controlled to achieve the opti-
    mum engine torque.
G   Depending on road condition, the vehicle may have a sluggish feel. This is normal, because optimum trac-          K
    tion has the highest priority during TCS operation.
G   TCS may be activated during sudden vehicle acceleration, wide open throttle acceleration, sudden trans-
    mission shifts or when the vehicle is driven on a road with a varying surface friction coefficient.               L
G   The SLIP indicator lamp flashes to inform the driver of TCS operation.
VDC Function                                                                                               EFS004MR
                                                                                                                      M
G   In addition to the ABS/TCS function, the driver steering amount and brake operation amount are detected
    from the steering angle sensor and pressure sensors, and the vehicle's driving status (amount of under
    steering/over steering) is determined using inputs from the yaw rate sensor/side G sensor, wheel speed
    sensors, etc. and this information is used to improve vehicle stability by controlling the braking and engine
    torque application to the wheels.
G   The SLIP indicator lamp flashes to inform the driver of VDC operation.
G   During VDC operation, the vehicle body and brake pedal may vibrate lightly and a mechanical noise may
    be heard. This is normal.
G   The ABS warning lamp, VDC OFF indicator lamp and SLIP indicator lamp may turn on when the vehicle is
    subject to strong shaking or large vibration, such as when the vehicle is on a turntable or a ship while the
    engine is running or on a steep slope. In this case, restart the engine on a normal road and if the ABS
    warning lamp, VDC OFF indicator lamp and SLIP indicator lamp turn off, there is no problem.
Fail-Safe Function                                                                                         EFS004MS


CAUTION:
If the Fail-Safe function is activated, perform the Self Diagnosis for ABS/TCS/VDC system.


Revision: November 2005                            BRC-9                                         2005 Pathfinder
                                      SYSTEM DESCRIPTION
                                                                                          [VDC/TCS/ABS]
ABS/EBD SYSTEM
In case of an electrical malfunction with the ABS, the ABS warning lamp, VDC OFF indicator lamp and SLIP
indicator lamp will turn on. In case of an electrical malfunction with the EBD system, the BRAKE warning lamp,
ABS warning lamp, VDC OFF indicator lamp and SLIP indicator lamp will turn on.
The system will revert to one of the following conditions of the Fail-Safe function.
1. For ABS malfunction, only the EBD is operative and the condition of the vehicle is the same condition of
     vehicles without ABS/TCS/VDC system.
2. For EBD malfunction, the EBD and ABS become inoperative, and the condition of the vehicle is the same
     as the condition of vehicles without ABS/TCS/VDC or EBD system.
VDC/TCS SYSTEM
In case of TCS/VDC system malfunction, the VDC OFF indicator lamp and SLIP indicator lamp are turned on
and the condition of the vehicle is the same as the condition of vehicles without TCS/VDC system. In case of
an electrical malfunction with the TCS/VDC system, the ABS control continues to operate normally without
TCS/VDC control.
Hydraulic Circuit Diagram                                                                                 EFS004MT




                                                                                                    WFIA0357E




Revision: November 2005                          BRC-10                                       2005 Pathfinder
                                CAN COMMUNICATION
                                                    [VDC/TCS/ABS]
CAN COMMUNICATION                                           PFP:23710
                                                                          A
System Description                                             EFS004MU


Refer to LAN-24, "CAN COMMUNICATION" .
                                                                          B



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                                                                          BRC



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Revision: November 2005                  BRC-11       2005 Pathfinder
                                        TROUBLE DIAGNOSIS
                                                                          [VDC/TCS/ABS]
TROUBLE DIAGNOSIS                                                                 PFP:00000

How to Perform Trouble Diagnoses for Quick and Accurate Repair                        EFS004MV

INTRODUCTION
The ABS/TCS/VDC system has an electronic control unit to control
major functions. The control unit accepts input signals from sensors
and controls actuator operation. It is also important to check for con-
ventional problems such as air leaks in the booster or lines, lack of
brake fluid, or other problems with the brake system.
It is much more difficult to diagnose a problem that occurs intermit-
tently rather than continuously. Most intermittent problems are
caused by poor electrical connections or faulty wiring. In this case,
careful checking of suspicious circuits may help prevent the replace-
ment of good parts.
A visual check only may not find the cause of the problem, so a road
                                                                                   SEF233G
test should be performed.
Before undertaking actual checks, take just a few minutes to talk with
a customer who approaches with a ABS/TCS/VDC complaint. The
customer is a very good source of information on such problems,
especially intermittent ones. Through the talks with the customer,
find out what symptoms are present and under what conditions they
occur.
Start your diagnosis by looking for "conventional" problems first. This
is one of the best ways to troubleshoot brake problems on a ABS/
TCS/VDC equipped vehicle. Also check related Service Bulletins for
information.
                                                                                   SEF234G




Revision: November 2005                            BRC-12                   2005 Pathfinder
                          TROUBLE DIAGNOSIS
                                              [VDC/TCS/ABS]
WORK FLOW
                                                                  A



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                                                     WFIA0358E




Revision: November 2005        BRC-13           2005 Pathfinder
                                         TROUBLE DIAGNOSIS
                                                                            [VDC/TCS/ABS]
CLARIFY CONCERN
G   A customer's description of a vehicle concern may vary depend-
    ing on the individual. It is important to clarify the customer's con-
    cern.
G   Ask the customer about what symptoms are present under what
    conditions. Use this information to reproduce the symptom while
    driving.
G   It is also important to use the diagnosis sheet to understand
    what type of trouble the customer is having.


                                                                                      SBR339B


EXAMPLE OF DIAGNOSIS SHEET




                                                                                   WFIA0097E




Revision: November 2005                             BRC-14                    2005 Pathfinder
                          TROUBLE DIAGNOSIS
                                                 [VDC/TCS/ABS]
Component Parts and Harness Connector Location                EFS004MW

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                                                        WFIA0359E




Revision: November 2005         BRC-15             2005 Pathfinder
                          TROUBLE DIAGNOSIS
                                              [VDC/TCS/ABS]
Schematic                                                  EFS004MX




                                                     WFWA0279E




Revision: November 2005        BRC-16           2005 Pathfinder
                           TROUBLE DIAGNOSIS
                                               [VDC/TCS/ABS]
Wiring Diagram -- VDC --                                    EFS004MY

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                                                      WFWA0227E




Revision: November 2005         BRC-17           2005 Pathfinder
                          TROUBLE DIAGNOSIS
                                              [VDC/TCS/ABS]




                                                     WFWA0218E




Revision: November 2005        BRC-18           2005 Pathfinder
                          TROUBLE DIAGNOSIS
                                              [VDC/TCS/ABS]

                                                                  A



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                                                     WFWA0219E




Revision: November 2005        BRC-19           2005 Pathfinder
                          TROUBLE DIAGNOSIS
                                              [VDC/TCS/ABS]




                                                     WFWA0220E




Revision: November 2005        BRC-20           2005 Pathfinder
                          TROUBLE DIAGNOSIS
                                              [VDC/TCS/ABS]

                                                                  A



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                                                     WFWA0280E




Revision: November 2005        BRC-21           2005 Pathfinder
                          TROUBLE DIAGNOSIS
                                              [VDC/TCS/ABS]




                                                     WFWA0281E




Revision: November 2005        BRC-22           2005 Pathfinder
                          TROUBLE DIAGNOSIS
                                              [VDC/TCS/ABS]

                                                                  A



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                                                     WFWA0282E




Revision: November 2005        BRC-23           2005 Pathfinder
                                          TROUBLE DIAGNOSIS
                                                                                                 [VDC/TCS/ABS]
Basic Inspection                                                                                                EFS004MZ

BRAKE FLUID LEVEL, FLUID LEAK, AND BRAKE PAD INSPECTION
1.   Check fluid level in the brake fluid reservoir. If fluid level is low, add fluid.
2.   Check the brake piping and around the ABS actuator and electric unit (control unit) for leaks. If there is
     leaking or seeping fluid, check the following items.
     G If ABS actuator and electric unit (control unit) connection is loose, tighten the piping to the specified
        torque and recheck for leaks.
     G If there is damage to the connection flare nut or ABS actuator and electric unit (control unit) threads,
        replace the damaged part and recheck for leaks.
     G When there is fluid leaking or seeping from a fluid connection, use a clean cloth to wipe off the fluid and
        recheck for leaks. If fluid is still seeping out, replace the damaged part. If the fluid is leaking at the ABS
        actuator and electric unit (control unit), replace the ABS actuator and electric unit (control unit) assem-
        bly.
        CAUTION:
        The ABS actuator and electric unit (control unit) cannot be disassembled and must be replaced
        as an assembly.
3.   Check the brake pads for excessive wear.
POWER SYSTEM TERMINAL LOOSENESS AND BATTERY INSPECTION
Make sure the battery positive cable, negative cable and ground connection are not loose. In addition, make
sure the battery is sufficiently charged.
ABS WARNING LAMP, SLIP INDICATOR LAMP AND VDC OFF INDICATOR LAMP INSPECTION
1.   Make sure ABS warning lamp, SLIP indicator lamp and VDC OFF indicator lamp (when VDC OFF switch
     is off), turn on for approximately 2 seconds when the ignition switch is turned ON. If they do not, check the
     ABS warning lamp, SLIP indicator lamp and VDC OFF indicator lamp. Check CAN communications. If
     there are no errors with the CAN communication system, check combination meter. Refer to DI-4, "COM-
     BINATION METERS" .
2.   Make sure the lamps turn off approximately 2 seconds after the ignition switch is turned ON. If the lamp
     does not turn off, conduct self-diagnosis.
     NOTE:
     G On 4WD vehicles, when the transfer case is placed in 4LO, the VDC system is disabled and the VDC
        OFF indicator will turn on.
     G If the battery has been disconnected, the TCS/VDC system is initialized and the SLIP and VDC OFF
        indicator lamps may not turn off after 2 seconds when the ignition switch is turned ON. In this case,
        refer to BRC-30, "SELF-DIAGNOSIS" .
3.   With the engine running, make sure the VDC OFF indicator lamp turns on and off when the VDC OFF
     switch is turned on and off. If the indicator lamp status does not correspond to switch operation, check the
     VDC OFF switch. Refer to BRC-52, "VDC OFF SWITCH" .
4.   Make sure ABS warning lamp, SLIP indicator lamp and VDC OFF indicator lamp turn off approximately 2
     seconds after the ignition switch is turned ON. If ABS warning lamp, SLIP indicator lamp and VDC OFF
     indicator lamp have not turned off 2 seconds after the ignition switch is turned ON, conduct self-diagnosis
     of the ABS actuator and electric unit (control unit).
5.   After conducting the self-diagnosis, be sure to erase the error memory. Refer to BRC-29, "CONSULT-II
     Function (ABS)" .




Revision: November 2005                              BRC-24                                          2005 Pathfinder
                                                     TROUBLE DIAGNOSIS
                                                                                                                        [VDC/TCS/ABS]
For Fast and Accurate Diagnosis                                                                                                              EFS0059Z

PRECAUTIONS FOR DIAGNOSIS                                                                                                                               A
G       Before performing diagnosis, always read precautions. Refer to BRC-4, "PRECAUTIONS" .
G       If ABS actuator and electric unit (control unit), steering angle sensor, steering system parts or suspension
        system parts have been replaced, or if alignment has been adjusted, be sure to adjust neutral position of B
        steering angle sensor before driving. Refer to BRC-58, "Adjustment of Steering Angle Sensor Neutral
        Position" .
G       After diagnosis is finished, be sure to erase memory. Refer to BRC-30, "SELF-DIAGNOSIS" .                    C
G       When checking continuity and voltage between units, be sure to check for disconnection, looseness,
        bend, or collapse of connector terminals. If any non-standard condition is found, repair or replace connec-
        tor terminals.                                                                                               D
G       For intermittent symptoms, possible cause is malfunction in harness, harness connector, or terminals.
        Move harness, harness connector, and terminals to check for poor connections.
G       If a circuit tester is used for



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