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BRAKE CONTROL SYSTEM


F BRAKES

                                                                                                                                                                         A




                                                                                     SECTION
                                                                               BRAKE CONTROL SYSTEM
                                                                                                              BRC                                                        B



                                                                                                                                                                         C


                                                                                                                                                                         D


                                                                                                                                                                         E
                                                                    CONTENTS
                           VDC/TCS/ABS                                               For Fast and Accurate Diagnosis .......................... 35              .        BRC
                                                                                       PRECAUTIONS FOR DIAGNOSIS .................... 35                        .
PRECAUTIONS ......................................................... 3    .         Basic Inspection .................................................... 37   .
 Precautions for Supplemental Restraint System                                         BASIC INSPECTION 1: BRAKE FLUID LEVEL                                             G
 (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                               AND LEAK INSPECTION ................................... 37               .
 SIONER" ................................................................. 3
                                                                           .           BASIC INSPECTION 2: INSPECTION FOR
 Precautions for Brake System ................................. 3          .           LOOSENESS OF POWER SYSTEM TERMI-
 Precautions for Brake Control ................................. 3         .                                                                                             H
                                                                                       NALS .................................................................. 37
                                                                                                                                                                .
PREPARATION .......................................................... 5   .           BASIC INSPECTION 3: INSPECTION OF ABS
 Special Service Tools .............................................. 5    .           WARNING LAMP, VDC OFF INDICATOR LAMP,
 Commercial Service Tools ....................................... 5        .           AND SLIP INDICATOR LAMP ............................ 37                  .         I
ON-VEHICLE SERVICE ............................................ 6          .         Inspection 1: Wheel Sensor Circuit ....................... 38              .
 Adjustment of Steering Angle Sensor Neutral Posi-                                     INSPECTION PROCEDURE ............................. 38                    .
 tion .......................................................................... 6
                                                                           .         Inspection 2: Engine System ................................. 40           .        J
GENERAL INFORMATION ........................................ 7             .         Inspection 3: VDC/TCS/ABS Control Unit Circuit ... 41
 Fail-Safe .................................................................. 7
                                                                           .         Inspection 4: Pressure Sensor and Circuit Between
    ABS SYSTEM ...................................................... 7    .         Pressure sensor and VDC/TCS/ABS Control Unit... 41
    VDC/TCS SYSTEM .............................................. 7        .                                                                                             K
                                                                                     Inspection 5: Steering Angle Sensor and Circuit
 Hydraulic Pressure Control System Diagram .......... 7                    .         Between Steering Angle Sensor and VDC/TCS/
 ABS Function .......................................................... 7 .         ABS Control Unit ................................................... 42    .
 TCS Function .......................................................... 8 .         Inspection 6: Yaw Rate/Side G Sensor and Circuit                                    L
 VDC Function .......................................................... 8 .         Between Yaw Rate/Side G Sensor and VDC/TCS/
 System Diagram ...................................................... 8   .         ABS Control Unit ................................................... 44    .
CAN COMMUNICATION ........................................... 9            .         Inspection 7: Solenoid, VDC Switching Valve, and                                    M
 System Description ................................................. 9    .         Circuits ................................................................... 46
                                                                                                                                                                .
TROUBLE DIAGNOSIS ........................................... 10           .         Inspection 8: Actuator Motor, Motor Relay, and Cir-
 How to Perform Trouble Diagnoses ...................... 10                .         cuit ......................................................................... 48
                                                                                                                                                                .
    BASIC CONCEPT .............................................. 10        .         Inspection 9: Solenoid Valve Relay and Circuit ..... 51                    .
    DIAGNOSIS FLOW CHART ...............................11                 .         Inspection 10: Stop Lamp Switch and Circuit ........ 53                    .
    ASKING COMPLAINTS ..................................... 12             .         Inspection 11: VDC/TCS/ABS Control Unit Power
    EXAMPLE OF DIAGNOSIS SHEET .................. 12                       .         Supply Circuit ........................................................ 54 .
 Component Parts Location .................................... 13          .         Inspection 12 When "SHIFT POSITION ERROR"
 Schematic ............................................................. 14.         Appears in Self-Diagnostic results Display (A/T
 Wiring Diagram -- VDC -- .................................... 15          .         Models) .................................................................. 56
                                                                                                                                                                .
 Control Unit Input/Output Signal Standard ............ 23                 .         Inspection 13: When "EMERGENCY BRAKE"
    STANDARDS BY CONSULT-II ........................... 23                 .         Appears on Self-Diagnostic Results Display ......... 56                    .
 CONSULT-II Functions .......................................... 25        .         Inspection 14: Brake Fluid Level in Reservoir Tank,
    CONSULT-II MAIN FUNCTION .......................... 25                 .         Communication Circuit Between VDC/TCS/ABS
    SELF-DIAGNOSIS ............................................. 26        .         Control Unit and Brake Fluid Level Switch ............ 57                  .
    DATA MONITOR ................................................ 29       .         Inspection 15: CAN Communication Circuit .......... 58                     .
    ACTIVE TEST .................................................... 31    .

Edition; 2004 September                                                       BRC-1                                                         2005 G35 Sedan
 Component Inspection ........................................... 58       .        VDC/TCS/ABS CONTROL UNIT .............................67             .
   VDC OFF SWITCH ............................................ 58          .         Removal and Installation ........................................67 .
   ABS MOTOR RELAY AND ACTUATOR RELAY... 58                                            REMOVAL ...........................................................67
                                                                                                                                                         .
   VDC/TCS/ABS ACTUATOR ............................... 59                 .           INSTALLATION ...................................................67.
 Symptom 1: ABS Works Frequently ...................... 59                 .        SENSOR ROTOR .....................................................68 .
 Symptom 2: Unexpected Pedal Reaction .............. 59                    .         Removal and Installation ........................................68 .
 Symptom 3: Long Stopping Distance ..................... 60                .           REMOVAL ...........................................................68
                                                                                                                                                         .
 Symptom 4: ABS Does Not Work .......................... 61                .           INSTALLATION ...................................................68.
 Symptom 5: Pedal Vibration and Sound ................ 61                  .        VDC/TCS/ABS ACTUATOR .....................................69         .
 Symptom 6: VDC OFF Indicator Lamp Does Not Illu-                                    Removal and Installation ........................................69 .
 minate .................................................................... 63
                                                                           .        G-SENSOR ...............................................................70
                                                                                                                                                         .
 Symptom 7: SLIP Indicator Lamp Does Not Illumi-                                     Removal and Installation ........................................70 .
 nate ........................................................................ 63
                                                                           .           REMOVAL ...........................................................70
                                                                                                                                                         .
 Symptom 8: Vehicle Behaves Jerkily During VDC/                                        INSTALLATION ...................................................70.
 TCS/ABS Operation .............................................. 64       .        STEERING ANGLE SENSOR ..................................71           .
WHEEL SENSOR ..................................................... 66      .         Removal and Installation ........................................71 .
 Removal and Installation ....................................... 66       .           REMOVAL ...........................................................71
                                                                                                                                                         .
   REMOVAL .......................................................... 66   .           INSTALLATION ...................................................71.
   INSTALLATION ................................................... 66     .




Edition; 2004 September                                                      BRC-2                                                     2005 G35 Sedan
                                             PRECAUTIONS
                                                                                            [VDC/TCS/ABS]
PRECAUTIONS
[VDC/TCS/ABS]                                                       PFP:00001
                                                                                                                       A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER"                                                                                         AFS002SS


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                                                                                AFS00071


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 surface of body. If brake fluid is splashed on painted sur-
    faces of body immediately wipe it off with cloth and then wash it away with water.
                                                                                                                       I
q   Do not use mineral oils such as gasoline or kerosene to clean. They will ruin rubber parts and cause
    improper operation.
q   Use a flare nut wrench when removing flare nuts, and use a flare
                                                                                                                       J
    nut torque wrench when tighten 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 con-
    nectors of VDC/TCS/ABS control unit or the battery cable from
    the negative terminal.                                                                                             L
q   When installing brake piping, be sure to check torque.
                                                                                                         SBR686C
                                                                                                                       M
Precautions for Brake Control                                                                               AFS001J2


q   During ABS operation, brake pedal lightly vibrates and a mechanical sound may be heard. This is normal.
q   Just after starting vehicle after turning ignition switch ON, brake pedal may vibrate or motor operating
    sound may be heard from engine compartment. This is a normal condition 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 brake 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.
q   If there is a radio, antenna, or antenna lead-in wire (including wiring) near VDC/TCS/ABS control unit,
    ABS function may have a malfunction or error.



Edition; 2004 September                            BRC-3                                        2005 G35 Sedan
                                            PRECAUTIONS
                                                                                           [VDC/TCS/ABS]
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, bush, 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
    brakes may cause VDC OFF indicator lamp and SLIP indicator lamp to 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 sound may occur if
    brake pedal is used. The sound 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 or VDC OFF
    indicator lamp and SLIP indicator lamp may turn on. However, this is not a malfunction, if normal opera-
    tion can be resumed after restarting engine.
q   Sudden turns (such as spin turns, acceleration turns), drifting, etc. When VDC function is OFF (VDC OFF
    switch ON) may cause yaw rate/side G sensor system to indicate a malfunction. However, this is not a
    malfunction if normal operation can be resumed after restarting engine. Then erase memory of self-diag-
    nosis.




Edition; 2004 September                           BRC-4                                       2005 G35 Sedan
                                            PREPARATION
                                                                                                [VDC/TCS/ABS]
PREPARATION                                                                                                  PFP:00002
                                                                                                                           A
Special Service Tools                                                                                           AFS002RH


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
    ST3072000
    (J25405)
    Drift                                                              Installing rear sensor rotor.                       D
    a: 76.5 mm (3.012 in) dia.
    b: 55.0 mm (2.17 in) dia.
                                                           ZZC0760D
                                                                                                                           E
    ST27863000
    (--)
    Drift
    a: 75 mm (2.95 in) dia.                                                                                                BRC
    b: 62 mm (2.44 in) dia.
                                                                       Installing rear sensor rotor.
    KV40104710
                                                                                                                           G
    (--)
    Drift
                                                           ZZA0832D
    a: 76 mm (2.99 in) dia.
    b: 68.5 mm (2.697 in) dia.                                                                                             H
Commercial Service Tools                                                                                        AFS0007C


   Tool name                                                          Description                                           I


   1. Flare nut crowfoot                                                                                                   J
    a: 10 mm (0.39 in), 12 mm (0.47 in)                               Installing each brake piping
   2. Torque wrench

                                                                                                                           K
                                                           S-NT360




                                                                                                                           L



                                                                                                                           M




Edition; 2004 September                            BRC-5                                               2005 G35 Sedan
                                                 ON-VEHICLE SERVICE
                                                                                                [VDC/TCS/ABS]
ON-VEHICLE SERVICE                                                                                           PFP:00000

Adjustment of Steering Angle Sensor Neutral Position                                                              AFS0003V


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 VDC/TCS/ABS control unit                                       -
     Replacing VDC/TCS/ABS control unit                                                 -
     Removing/Installing steering angle sensor                                          



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