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BRAKE CONTROL SYSTEM


F BRAKES

                                                                                                                                                                      A




                                                                                     SECTION
                                                                               BRAKE CONTROL SYSTEM
                                                                                                             BRC                                                      B



                                                                                                                                                                      C


                                                                                                                                                                      D


                                                                                                                                                                      E
                                                                    CONTENTS
                           VDC/TCS/ABS                                                                                                                       ... 26   BRC
                                                                                       SELF-DIAGNOSIS ............................................. 27       .
PRECAUTIONS ......................................................... 3    .           DATA MONITOR ................................................ 30      .
 Precautions for Supplemental Restraint System                                         ACTIVE TEST .................................................... 33   .        G
 (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                             For Fast and Accurate Diagnosis .......................... 35           .
 SIONER" ................................................................. 3
                                                                           .           PRECAUTIONS FOR DIAGNOSIS .................... 35                     .
 Precautions for Brake System ................................. 3          .         Basic Inspection .................................................... 36.
 Precautions for Brake Control ................................. 3         .                                                                                          H
                                                                                       BASIC INSPECTION 1: BRAKE FLUID
PREPARATION .......................................................... 5   .           AMOUNT, LEAKS, AND BRAKE PADS INSPEC-
 Special Service Tools .............................................. 5    .           TION ................................................................... 36
                                                                                                                                                             .
 Commercial Service Tools ....................................... 5        .           BASIC INSPECTION 2: POWER SYSTEM TER-                                           I
ON-VEHICLE SERVICE ............................................ 6          .           MINAL LOOSENESS AND BATTERY INSPEC-
 Adjustment of Steering Angle Sensor Neutral Posi-                                     TION ................................................................... 36
                                                                                                                                                             .
 tion .......................................................................... 6
                                                                           .           BASIC INSPECTION 3: ABS WARNING LAMP,                                          J
 Calibration of Decel G Sensor (AWD Model) .......... 6                    .           VDC OFF INDICATOR LAMP, SLIP INDICATOR
SYSTEM DESCRIPTION ........................................... 8           .           LAMP AND BRAKE WARNING LAMP INSPEC-
 System Diagram ...................................................... 8   .           TION ................................................................... 37
                                                                                                                                                             .
 VDC Function .......................................................... 8 .                                                                                          K
                                                                                     Inspection 1: Wheel Sensor Circuit ....................... 37           .
 TCS Function .......................................................... 8 .         Inspection 2: Engine System ................................. 39        .
 ABS Function .......................................................... 8 .         Inspection 3: VDC/TCS/ABS Control Unit Circuit ... 40
 EBD Function .......................................................... 9 .         Inspection 4: Pressure Sensor Circuit ................... 40            .        L
 Fail-Safe Function ................................................... 9  .         Inspection 5: Steering Angle Sensor Circuit .......... 42               .
    VDC / TCS SYSTEM ............................................ 9        .         Inspection 6: Yaw Rate/Side G Sensor (2WD
    ABS, EBD SYSTEM ............................................. 9        .         Model), Yaw Rate/Side/Decel G sensor (AWD Mod-                                   M
 Hydraulic Circuit Diagram ..................................... 10        .         els) Circuit .............................................................. 44
                                                                                                                                                             .
CAN COMMUNICATION ..........................................11             .         Inspection 7: Solenoid and VDC Change-Over
 System Description ................................................11     .         Valve Circuit ........................................................... 46
                                                                                                                                                             .
TROUBLE DIAGNOSIS ........................................... 12           .         Inspection 8: Actuator Motor Circuit ...................... 47          .
 How to Proceed with Diagnosis ............................ 12             .         Inspection 9: ABS Actuator and Electric Unit (Con-
    BASIC CONCEPT .............................................. 12        .         trol Unit) Power Supply and Ground Circuit ........... 48               .
    DIAGNOSIS FLOWCHART ............................... 13                 .         Inspection 10: Stop Lamp Switch Circuit ............... 50              .
    ASKING COMPLAINTS ..................................... 14             .         Inspection 11: Brake Fluid Level Switch Circuit ..... 51                .
    EXAMPLE OF DIAGNOSIS SHEET .................. 14                       .         Inspection 12: When "ST ANG SEN SIGNAL"
 Component Installation Location ........................... 15            .         Appears on Self-diagnosis Results Display ........... 52                .
 Schematic ............................................................. 16.         Inspection 13: When "DECEL G SEN SET" Appears
 Wiring Diagram -- VDC -- .................................... 17          .         on Self-diagnostic Results Display (AWD Model) ... 52
 Control Unit Input/Output Signal Standard ............ 23                 .         Inspection 14: CAN Communication Circuit .......... 53                  .
    REFERENCE VALUE FROM CONSULT-II ........ 23                            .         Component Inspection ........................................... 53     .
 CONSULT-II Functions .......................................... 25        .           VDC OFF SWITCH ............................................ 53        .
    CONSULT-II MAIN FUNCTION .......................... 25                 .         Symptom 1: Excessive ABS Function Operation
    CONSULT-II BASIC OPERATION PROCEDURE

Revision: 2005 July                                                           BRC-1                                                                    2005 FX
 Frequency .............................................................. 53
                                                                         .        ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) ...60
 Symptom 2: Unexpected Pedal Reaction .............. 54                  .         Removal and Installation ........................................60 .
 Symptom 3: The Braking Distance is Long ............ 54                 .           REMOVAL ...........................................................60
                                                                                                                                                       .
 Symptom 4: The ABS Function Does Not Operate 55                         ...         INSTALLATION ...................................................60.
 Symptom 5: Pedal Vibration or ABS Operation                                      G SENSOR ...............................................................62
                                                                                                                                                       .
 Sound Occurs ........................................................ 55.         Removal and Installation ........................................62 .
 Symptom 6: Vehicle Jerks During VDC/TCS/ABS                                         REMOVAL ...........................................................62
                                                                                                                                                       .
 Control ................................................................... 55
                                                                         .           INSTALLATION ...................................................62.
WHEEL SENSORS .................................................. 57      .        STEERING ANGLE SENSOR ..................................63           .
 Removal and Installation ....................................... 57     .         Removal and Installation ........................................63 .
   REMOVAL .......................................................... 57 .           REMOVAL ...........................................................63
                                                                                                                                                       .
   INSTALLATION ................................................... 57   .           INSTALLATION ...................................................63.
SENSOR ROTOR ..................................................... 59    .
 Removal and Installation ....................................... 59     .
   REMOVAL .......................................................... 59 .
   INSTALLATION ................................................... 59   .




Revision: 2005 July                                                        BRC-2                                                                 2005 FX
                                             PRECAUTIONS
                                                                                            [VDC/TCS/ABS]
PRECAUTIONS
[VDC/TCS/ABS]                                                       PFP:00001
                                                                                                                       A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER"                                                                                         AFS00289


The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. 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 C
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:                                                                                                              D
q    To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
     in the event of a collision which would result in air bag inflation, all maintenance must be per-
     formed by an authorized NISSAN/INFINITI dealer.                                                                  E
q    Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
     sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
     Bag Module, see the SRS section.                                                                                BRC
q    Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
     Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
     harness connectors.
                                                                                                                      G
Precautions for Brake System                                                                               AFS001S3


q   Recommended fluid is brake fluid "DOT 3".
                                                                                                                       H
q   Do not reuse drained brake fluid.
q   Be careful not to splash brake fluid on painted areas such as body. If brake fluid is splashed, wipe it off
    and flush area with water immediately.
                                                                                                                       I
q   Do not use mineral oils such as gasoline or kerosene to clean. They will ruin rubber parts and cause
    improper operation.
q   Using a flare nut crowfoot and torque wrench, securely tighten
                                                                                                                       J
    brake tube flare nuts.
q   Brake system is an important safety part. If a brake fluid leak is
    detected, always disassemble the affected part. If a malfunction
    is detected, replace part with a new one.                                                                          K
q   Before working, turn ignition switch OFF and disconnect electri-
    cal connectors of ABS actuator and electric unit (control unit) or
    battery negative terminal.                                                                                         L
q   When installing brake piping, be sure to check torque.
WARNING:                                                                                              SBR686C
Clean brake pads and shoes with a waste cloth, then wipe with                                                          M
a dust collector.
Precautions for Brake Control                                                                              AFS001S4


q   During VDC/TCS/ABS operation, brake pedal lightly vibrates and a mechanical noise may be heard. This
    is normal.
q   Just after starting vehicle after turning ignition switch ON, brake pedal may vibrate or motor operating
    noise may be heard from engine room. This is a normal status of operation check.
q   Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
    or snow-covered (fresh, deep snow) roads.
q   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
    diagnostic servicing. Besides electrical system inspection, check booster operation, brake fluid level, and
    fluid leaks.
q   If tire size and type are used in an improper combination, or brake pads are not Genuine NISSAN parts,
    stopping distance or steering stability may deteriorate.


Revision: 2005 July                                BRC-3                                                2005 FX
                                             PRECAUTIONS
                                                                                            [VDC/TCS/ABS]
q   If there is a radio, antenna, or antenna lead-in wire (including wiring) near control module, VDC/TCS/ABS
    function may have a malfunction or error.
q   If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness
    pinches, open circuits, and improper wiring.
q   If the following components are replaced with non-genuine components or converted, VDC OFF indicator
    lamp and SLIP indicator lamp may turn on or the VDC system may not operate properly. Components
    related to suspension (shock absorber, strut, spring, bushing, etc.), Tires, wheels (exclude specified size),
    components related to brake (pad, rotor, caliper, etc.), components related to engine (muffler, ECM, etc.),
    components related to body reinforcement (roll bar, tower bar, etc.).
q   Driving in the condition of breakage or excessive wear of suspension, tires or components related to the
    brakes may cause VDC OFF indicator lamp and SLIP indicator lamp turn on, and the VDC system may
    not operate properly.
q   When the TCS or VDC is activated by sudden acceleration or sudden turn, some noise may occur. The
    noise is a result of the normal operation of the TCS and VDC.
q   When driving on roads which have extreme slopes (such as mountainous roads) or high banks (such as
    sharp carves on a freeway), the VDC may not operate normally, or VDC OFF indicator lamp and SLIP
    indicator lamp may turn on. However, this is not a malfunction, if normal operation can be resumed after
    restarting engine.
q   Sudden turns (such as spin turns, acceleration turns), drifting, etc. When VDC function is OFF (VDC OFF
    SW ON) may cause the G sensor system indicate a malfunction. However, this is not a malfunction, if nor-
    mal operation can be resumed after restarting engine.




Revision: 2005 July                                BRC-4                                                2005 FX
                                            PREPARATION
                                                                                                 [VDC/TCS/ABS]
PREPARATION                                                                                                 PFP:00002
                                                                                                                              A
Special Service Tools                                                                                              AFS001S7


The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
   Tool number                                                                                                                B
   (Kent-Moore No.)                                                    Description
   Tool name
                                                                                                                              C
   ST30720000
   (J 25405)
   Drift                                                                                                                      D
   a: 77 mm (3.03 in) dia.
   b: 55 mm (2.17 in) dia.
                                                            ZZA0701D
                                                                                                                              E

   ST27863000
   (--)
                                                                                                                              BRC
   Drift                                                               Installing rear sensor rotor
   a: 75 mm (2.95 in) dia.
   b: 62 mm (2.44 in) dia.
                                                            ZZA0832D                                                          G


   KV40104710
   (--)                                                                                                                       H
   Drift
   a: 76 mm (2.99 in) dia.
   b: 68.5 mm (2.697 in) dia.
                                                                                                                               I
                                                            ZZA0832D



Commercial Service Tools                                                                                           AFS001S8
                                                                                                                              J
    Tool name                                                          Description


                                                                                                                              K
    1: Flare nut crowfoot
     a: 10 mm (0.39 in)
                                                                       Removing and installing each brake piping
      : 12 mm (0.47 in)
    2: Torque wrench                                                                                                          L

                                                           S-NT360


                                                                                                                              M




Revision: 2005 July                                BRC-5                                                    2005 FX
                                                  ON-VEHICLE SERVICE
                                                                                                          [VDC/TCS/ABS]
ON-VEHICLE SERVICE                                                                                                     PFP:00000

Adjustment of Steering Angle Sensor Neutral Position                                                                       AFS001S9


In case of doing work that applies to the list below, make sure to adjust neutral position of steering angle sen-
sor before running vehicle.
                                   Situation                             Adjustment of Steering Angle Sensor Neutral Position
     Removing/Installing ABS actuator and electric unit (control unit)                            -
     Replacing ABS actuator and electric unit (control unit)                                      



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