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BRAKE CONTROL SYSTEM


F BRAKES

                                                                                                                                                                         A


                                                                                                                                                                         B
                                                                                     SECTION
                                                                               BRAKE CONTROL SYSTEM                                                                      C


                                                                                                                                                                         D


                                                                                                                                                                         E
                                                                    CONTENTS
                           VDC/TCS/ABS                                               For Fast and Accurate Diagnosis .......................... 33              .        BRC
                                                                                       PRECAUTIONS FOR DIAGNOSIS .................... 33                        .
PRECAUTIONS ......................................................... 3    .         Basic Inspection .................................................... 35   .
 Precautions for Supplemental Restraint System                                         BASIC INSPECTION 1: BRAKE FLUID LEVEL                                             G
 (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                               AND LEAK INSPECTION ................................... 35               .
 SIONER" ................................................................. 3
                                                                           .           BASIC INSPECTION 2: INSPECTION FOR
 Precautions for Brake System ................................. 3          .           LOOSENESS OF POWER SYSTEM TERMI-
 Precautions for Brake Control ................................. 3         .                                                                                             H
                                                                                       NALS .................................................................. 35
                                                                                                                                                                .
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 ............................ 35                  .         I
ON-VEHICLE SERVICE ............................................ 6          .         Inspection 1: Wheel Sensor System ...................... 36                .
 Adjustment of Steering Angle Sensor Neutral Posi-                                     INSPECTION PROCEDURE ............................. 36                    .
 tion .......................................................................... 6
                                                                           .         Inspection 2: Engine System ................................. 38           .        J
GENERAL INFORMATION ........................................ 7             .         Inspection 3: VDC/TCS/ABS Control Unit System 39                           ...
 Fail-Safe .................................................................. 7
                                                                           .         Inspection 4: Pressure Sensor and Circuit Between
    ABS SYSTEM ...................................................... 7    .         Pressure sensor and VDC/TCS/ABS Control Unit... 39
    VDC/TCS SYSTEM .............................................. 7        .                                                                                             K
                                                                                     Inspection 5: Steering Angle Sensor and Circuit
 Hydraulic Circuit Diagram ....................................... 7       .         Between Steering Angle Sensor and VDC/TCS/
 ABS Function .......................................................... 7 .         ABS Control Unit ................................................... 41    .
 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 ................................................... 42    .
CAN COMMUNICATION ........................................... 9            .         Inspection 7: Solenoid, VDC Switching Valve, and                                    M
 System Description ................................................. 9    .         Circuits ................................................................... 44
                                                                                                                                                                .
TROUBLE DIAGNOSIS ........................................... 10           .         Inspection 8: Actuator Motor, Motor Relay, and Cir-
 How to Perform Trouble Diagnoses ...................... 10                .         cuit ......................................................................... 46
                                                                                                                                                                .
    BASIC CONCEPT .............................................. 10        .         Inspection 9: Solenoid Valve Relay and Circuit ..... 48                    .
    DIAGNOSIS FLOW CHART ...............................11                 .         Inspection 10: Stop Lamp Switch and Circuit ........ 50                    .
    ASKING COMPLAINTS ..................................... 12             .         Inspection 11: VDC/TCS/ABS Control Unit Power
    EXAMPLE OF DIAGNOSIS SHEET .................. 12                       .         Supply Circuit ........................................................ 51 .
 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) .................................................................. 53
                                                                                                                                                                .
 Control Unit Input/Output Signal Standard ............ 22                 .         Inspection 13: When "EMERGENCY BRAKE"
    STANDARDS BY CONSULT-II ........................... 22                 .         Appears on Self-Diagnostic Results Display ......... 54                    .
 CONSULT-II Functions .......................................... 24        .         Inspection 14: When "STEERING ANGLE SEN-
    CONSULT-II MAIN FUNCTION .......................... 24                 .         SOR HAS NOT BEEN CORRECTED" Appears on
    SELF-DIAGNOSIS ............................................. 24        .         Self-Diagnostic Results Display ............................. 54           .
    DATA MONITOR ................................................ 27       .         Inspection 15: Brake Fluid Level in Reservoir Tank,
    ACTIVE TEST .................................................... 30    .

                                                                              BRC-1
Communication Circuit Between VDC/TCS/ABS                                          WHEEL SENSOR .....................................................65 .
Control Unit and Brake Fluid Level Sensor ........... 55                  .         Removal and Installation ........................................65 .
Inspection 16: CAN Communication Lines, VDC/                                          REMOVAL ...........................................................65
                                                                                                                                                        .
TCS/ABS Control Unit, and Steering Angle Sensor                                       INSTALLATION ...................................................65.
System ................................................................... 55
                                                                          .        VDC/TCS/ABS CONTROL UNIT .............................66             .
Component Inspection ........................................... 56       .         Removal and Installation ........................................66 .
  VDC OFF SWITCH ............................................ 56          .           REMOVAL ...........................................................66
                                                                                                                                                        .
  VDC RELAY BOX ............................................... 56        .           INSTALLATION ...................................................66.
  VDC ACTUATOR ................................................ 57        .        SENSOR ROTOR .....................................................67 .
Symptom 1: ABS Works Frequently. ..................... 58                 .         Removal and Installation ........................................67 .
Symptom 2: Unexpected Pedal Reaction .............. 58                    .           REMOVAL ...........................................................67
                                                                                                                                                        .
Symptom 3: Long Stopping Distance ..................... 59                .           INSTALLATION ...................................................67.
Symptom 4: ABS Does Not Work. ......................... 60                .        VDC/TCS/ABS ACTUATOR .....................................68         .
Symptom 5: Pedal Vibration and Noise ................. 60                 .         Removal and Installation ........................................68 .
Symptom 6: VDC OFF Indicator Lamp Does Not Illu-                                   G-SENSOR ...............................................................69
                                                                                                                                                        .
minate .................................................................... 62
                                                                          .         Removal and Installation ........................................69 .
Symptom 7: SLIP Indicator Lamp Does Not Illumi-                                       REMOVAL ...........................................................69
                                                                                                                                                        .
nate ........................................................................ 62
                                                                          .           INSTALLATION ...................................................69.
Symptom 8: Vehicle Behaves Jerkily During VDC/                                     STEERING ANGLE SENSOR ..................................70           .
TCS/ABS Operation. ............................................. 63       .         Removal and Installation ........................................70 .
                                                                                      REMOVAL ...........................................................70
                                                                                                                                                        .
                                                                                      INSTALLATION ...................................................70.




                                                                            BRC-2
                                             PRECAUTIONS
                                                                                            [VDC/TCS/ABS]
PRECAUTIONS
[VDC/TCS/ABS]                                                       PFP:00001
                                                                                                                       A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER"                                                                                         AFS0027E


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 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 wrench, securely tighten brake tube flare nuts.
                                                                                                                       J
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 actuator and VDC/TCS/ABS control unit or bat-
    tery negative terminal.
q   When installing brake piping, be sure to check torque.                                                             L


                                                                                                         SBR686C
                                                                                                                       M
Precautions for Brake Control                                                                               AFS001J2


q   During ABS operation, brake pedal lightly vibrates and a mechanical noise may be heard. This is normal.
q   Just after starting vehicle after 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.
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.



                                                   BRC-3
                                            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 noise may occur if brake
    pedal is used. 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 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
    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.




                                                  BRC-4
                                            PREPARATION
                                                                                                [VDC/TCS/ABS]
PREPARATION                                                                                                PFP:00002
                                                                                                                             A
Special Service Tools                                                                                             AFS001I2


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                                                                                                               BRC
    (--)                                                               Installing rear sensor rotor
    Drift

                                                                                                                             G
                                                           ZZC1307D




                                                                                                                             H
    KV40104710
    (--)                                                               Installing rear sensor rotor
    Drift
                                                                                                                              I
                                                           ZZC1082D



Commercial Service Tools                                                                                          AFS0007C
                                                                                                                             J
   Tool name                                                          Description

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

                                                           S-NT360


                                                                                                                             M




                                                   BRC-5
                                                 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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