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BRAKE CONTROL SYSTEM


F BRAKES

                                                                                                                                                                         A




                                                                                     SECTION
                                                                               BRAKE CONTROL SYSTEM
                                                                                                              BRC                                                        B



                                                                                                                                                                         C


                                                                                                                                                                         D


                                                                                                                                                                         E
                                                                    CONTENTS
PRECAUTIONS ......................................................... 3    .           ACTIVE TEST .................................................... 30      .        BRC
 Precautions for Supplemental Restraint System                                       For Fast and Accurate Diagnosis .......................... 34              .
 (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                               PRECAUTIONS FOR DIAGNOSIS .................... 34                        .
 SIONER" ................................................................. 3
                                                                           .         Basic Inspection .................................................... 36   .        G
 Precautions for Brake System ................................. 3          .           BASIC INSPECTION 1: BRAKE FLUID LEVEL
 Precautions for Brake Control ................................. 3         .           AND LEAK INSPECTION ................................... 36               .
 Diagnosis Precaution .............................................. 4     .           BASIC INSPECTION 2: INSPECTION FOR
                                                                                                                                                                         H
    CAN SYSTEM ...................................................... 4    .           LOOSENESS OF POWER SYSTEM TERMI-
PREPARATION .......................................................... 5   .           NALS .................................................................. 36
                                                                                                                                                                .
 Special Service Tools .............................................. 5    .           BASIC INSPECTION 3: INSPECTION OF ABS
 Commercial Service Tools ....................................... 5        .           WARNING LAMP, VDC OFF INDICATOR LAMP,                                              I
ON-VEHICLE SERVICE ............................................ 6          .           AND SLIP INDICATOR LAMP ............................ 36                  .
 Adjustment of Steering Angle Sensor Neutral Posi-                                   Inspection 1 Wheel Sensor System ....................... 37                .
 tion .......................................................................... 6
                                                                           .           INSPECTION PROCEDURE ............................. 37                    .        J
SYSTEM DESCRIPTION ........................................... 7           .         Inspection 2 Engine System .................................. 39           .
 Fail-Safe .................................................................. 7
                                                                           .         Inspection 3 VDC/TCS/ABS Control Unit System... 39
    ABS SYSTEM ...................................................... 7    .         Inspection 4 Pressure Sensor and Circuit Between
                                                                                                                                                                         K
    VDC/TCS SYSTEM .............................................. 7        .         Pressure Sensor and VDC/TCS/ABS Control Unit 40                            ...
 Hydraulic Circuit Diagram ....................................... 7       .         Inspection 5 Steering Angle Sensor and Circuit
 ABS Function .......................................................... 7 .         Between Steering Angle Sensor and VDC/TCS/
 TCS Function .......................................................... 8 .         ABS Control Unit ................................................... 41    .        L
 VDC Function .......................................................... 8 .         Inspection 6 Yaw Rate/Side G-Sensor and Circuit
 System Diagram ...................................................... 8   .         Between Yaw Rate/Side G-Sensor and VDC/TCS/
CAN COMMUNICATION ........................................... 9            .         ABS Control Unit ................................................... 43    .        M
 System Description ................................................. 9    .         Inspection 7 Solenoid, VDC Switching Valve, and
TROUBLE DIAGNOSIS ........................................... 10           .         Circuits ................................................................... 44
                                                                                                                                                                .
 How to Proceed With Diagnosis ............................ 10             .         Inspection 8 Actuator Motor, Motor Relay, and Cir-
    BASIC CONCEPT .............................................. 10        .         cuit ......................................................................... 46
                                                                                                                                                                .
    DIAGNOSIS FLOWCHART ................................11                 .         Inspection 9 Actuator Relay and Circuit ................ 48                .
    ASKING COMPLAINTS ..................................... 12             .         Inspection 10 Stop Lamp Switch and Circuit ......... 50                    .
    EXAMPLE OF DIAGNOSIS SHEET .................. 12                       .         Inspection 11 VDC/TCS/ABS Control Unit Power
 Component Installation Location ........................... 13            .         Circuit .................................................................... 51
                                                                                                                                                                .
 Schematic ............................................................. 14.         Inspection 12 When "SHIFT POSITION ERROR"
 Wiring Diagram -- VDC -- .................................... 15          .         Appears in Self-Diagnosis Results Display ........... 53                   .
 Control Unit Input/Output Signal Standard ............ 23                 .         Inspection 13 When "EMERGENCY BRAKE"
    STANDARDS BY CONSULT-II ........................... 23                 .         Appears on Self-Diagnosis Results Display .......... 53                    .
 CONSULT-II Functions .......................................... 24        .         Inspection 14 When "STEERING ANGLE SENSOR
    CONSULT-II MAIN FUNCTION .......................... 24                 .         HAS NOT BEEN CORRECTED" Appears on Self-
    SELF-DIAGNOSIS ............................................. 25        .         Diagnosis Results Display ..................................... 54         .
    DATA MONITOR ................................................ 28       .         Inspection 15 Brake Fluid Level in Reservoir Tank,


                                                                              BRC-1
Communication Circuit Between VDC/TCS/ABS                                          WHEEL SENSORS ..................................................64   .
Control Unit and Brake Fluid Level Sensor ........... 54                  .         Removal and Installation ........................................64 .
Inspection 16 CAN Communications Lines, VDC/                                          REMOVAL ...........................................................64
                                                                                                                                                        .
TCS/ABS Control Unit and Steering Angle Sensor                                        INSTALLATION ...................................................64.
System ................................................................... 55
                                                                          .        VDC/TCS/ABS CONTROL UNIT .............................65             .
Inspecting Components ......................................... 55        .         Removal and Installation ........................................65 .
  VDC OFF SWITCH ............................................ 55          .           REMOVAL ...........................................................65
                                                                                                                                                        .
  VDC RELAY BOX ............................................... 56        .           INSTALLATION ...................................................65.
  VDC/TCS/ABS ACTUATOR ............................... 56                 .        SENSOR ROTOR .....................................................66 .
Symptom 1 ABS Works Frequently. ...................... 58                 .         Removal and Installation ........................................66 .
Symptom 2 Unexpected Pedal Reaction ............... 58                    .           REMOVAL ...........................................................66
                                                                                                                                                        .
Symptom 3 Long Stopping Distance ...................... 59                .           INSTALLATION ...................................................66.
Symptom 4 ABS Does Not Work. .......................... 60                .        VDC/TCS/ABS ACTUATOR .....................................67         .
Symptom 5 Pedal Vibration and Noise .................. 60                 .         Removal and Installation ........................................67 .
Symptom 6 VDC OFF Indicator Lamp Does Not Illu-                                    G SENSOR ...............................................................68
                                                                                                                                                        .
minate. ................................................................... 62
                                                                          .         Removal and Installation ........................................68 .
Symptom 7 SLIP Indicator Lamp Does Not Illumi-                                        REMOVAL ...........................................................68
                                                                                                                                                        .
nate. ....................................................................... 62
                                                                          .           INSTALLATION ...................................................68.
Symptom 8 Vehicle Behaves Jerkily During VDC/                                      STEERING ANGLE SENSOR ..................................69           .
TCS/ABS Operation. ............................................. 63       .         Removal and Installation ........................................69 .
                                                                                      REMOVAL ...........................................................69
                                                                                                                                                        .
                                                                                      INSTALLATION ...................................................69.




                                                                            BRC-2
                                             PRECAUTIONS

PRECAUTIONS                                                         PFP:00001
                                                                                                                       A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER"                                                                                         EFS00285


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 harness connec-
     tors.
                                                                                                                      G
Precautions for Brake System                                                                                EFS00209


q   Recommended fluid is brake fluid "DOT 3".
                                                                                                                       H
q   Never 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   Never use mineral oils such as gasoline or kerosene to clean. They will ruin rubber parts and cause
    improper operation.
q   Using a flare nut torque wrench, securely tighten brake tube
                                                                                                                       J
    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 actuator and control or battery negative termi-
    nals.                                                                                                              L
q   When installing brake piping, be sure to check torque.
                                                                                                         SBR686C
                                                                                                                       M
Precautions for Brake Control                                                                               EFS0020A


q   During ABS, TCS and VDC operations of sudden deceleration and turn, 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 compartment. 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
    oil 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 control module, ABS function
    may have a malfunction or error.


                                                   BRC-3
                                            PRECAUTIONS

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 non-standard suspension parts (shock absorber, strut, spring, bushing, etc.) and reinforcements (roll
    bar, tower bar, etc.) are attached, or if suspension parts deteriorate significantly, VDC may not operate
    normally and VDC warning lamp may turn on.
q   If non-standard engine components (muffler, etc.) are attached, VDC may not operate normally and VDC
    warning lamp may turn on.
q   When driving on a steep slope (as a bank), VDC may not operate normally and VDC warning lamp may
    turn on. In this case, start engine to resume the normal screen. This is normal.
Diagnosis Precaution                                                                                     EFS0020B

CAN SYSTEM
q   Do not apply voltage of 7.0V or higher to terminal to be measured.
q   Maximum open terminal voltage of tester in use shall be 7.0V or lower.
q   Before checking harnesses, turn ignition switch to OFF and disconnect battery negative cable.




                                                  BRC-4
                                            PREPARATION

PREPARATION                                                                                                PFP:00002
                                                                                                                             A
Special Service Tools                                                                                             EFS00288


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                                                                                          EFS0020D
                                                                                                                             J
   Tool name                                                          Description

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

                                                           S-NT360


                                                                                                                             M




                                                   BRC-5
                                                 ON-VEHICLE SERVICE

ON-VEHICLE SERVICE                                                                                                  PFP:00000

Adjustment of Steering Angle Sensor Neutral Position                                                                     EFS0020E


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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