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BRAKE CONTROL SYSTEM

F BRAKES

SECTION
BRAKE CONTROL SYSTEM
BRC B

E
CONTENTS
PRECAUTIONS ......................................................... 3 . Functions of CONSULT-II ...................................... 30 . BRC
Precautions for Supplemental Restraint System CONSULT-II MAIN FUNCTION .......................... 30 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- DATA MONITOR ................................................ 30 .
SIONER" ................................................................. 3
. SELF-DIAGNOSIS ............................................. 33 . G
Precautions for Brake System ................................. 3 . ACTIVE TEST .................................................... 36 .
Precautions for Brake Control ................................. 3 . Refer to "For Correct and Quick Diagnosis". ......... 39 .
Precautions for Trouble Diagnosis .......................... 4 . PRECAUTIONS FOR TROUBLE DIAGNOSIS ... 39
H
CAN SYSTEM ...................................................... 4 . Basic Inspection .................................................... 40 .
Precautions for Harness Repair .............................. 4 . PRELIMINARY CHECK 1: (BRAKE FLUID
CAN SYSTEM ...................................................... 4 . LEVEL AND LEAK INSPECTION) ..................... 40 .
ON-VEHICLE SERVICE ............................................ 5 . PRELIMINARY 2: (INSPECTION FOR LOOSE I
Adjustment of Neutral Position of Steering Angle POWER SUPPLY TERMINAL) ........................... 40 .
Sensor ..................................................................... 5
. PRELIMINARY 3: (INSPECTION FOR ABS
GENERAL INFORMATION ........................................ 6 . WARNING LAMP, VDC OFF INDICATOR LAMP, J
Fail-Safe .................................................................. 6
. AND SLIP INDICATOR LAMP) ........................... 40 .
ABS SYSTEM ...................................................... 6 . Self-Diagnoses ...................................................... 41 .
VDC/TCS SYSTEM .............................................. 6 . FUNCTION ......................................................... 41 .
K
Hydraulic Circuit ...................................................... 6
. PROCEDURE .................................................... 41 .
ABS Functions ........................................................ 6
. HOW TO READ SELF-DIAGNOSIS RESULTS
TCS Functions ........................................................ 7
. (MALFUNCTION) ............................................... 41 .
VDC Functions ........................................................ 7
. HOW TO ERASE SELF-DIAGNOSIS RESULTS L
System Diagram ...................................................... 7. (MALFUNCTION) ............................................... 42 .
CAN Communication ............................................... 8 . INDICATION ITEM ............................................. 42 .
SYSTEM DESCRIPTION ..................................... 8 . Inspection 1 CAN Communication Line or VDC/ M
FOR VDC MODELS ............................................. 8 . TCS/ABS Control Unit and Steering Angle Sensor
FOR ICC MODELS .............................................. 9 . System ................................................................... 45
.
TROUBLE DIAGNOSIS ............................................11 . Inspection 2 Engine System .................................. 46 .
How to Perform Trouble Diagnoses for Quick and Inspection 3 VDC/TCS/ABS Control Unit System... 46
Accurate Repair .....................................................11. Inspection 4 Pressure Sensor and the Circuit
INTRODUCTION .................................................11 . between Pressure Sensor and VDC/TCS/ABS Con-
WORK FLOW ..................................................... 12 . trol Unit .................................................................. 47
.
ASKING COMPLAINTS ..................................... 13 . Inspection 5 Steering Wheel Angle Sensor and the
EXAMPLE OF DIAGNOSIS SHEET .................. 13 . Path between Steering Wheel Angle Sensor and
Component Parts and Harness Connector Location 14 ... VDC/TCS/ABS Control Unit ................................... 49 .
Schematic ............................................................. 15
. Inspection 6 Yaw Rate Sensor/Side G-sensor and
Wiring Diagram -VDC- .......................................... 16 . Path between Yaw Rate Sensor/Side G-sensor and
Control Unit Input/Output Signal Standard ............ 24 . VDC/TCS/ABS Control Unit. .................................. 50 .
STANDARDS USING A CIRCUIT TESTER AND Inspection 7 Precharging Pump Motor and Circuit 52 ...
OSCILLOSCOPE ............................................... 24 . Inspection 8 Solenoid, VDC Switching Valve and
STANDARDS WITH CONSULT-II ...................... 27 . Circuit .................................................................... 54
.

Revision: 2004 April BRC-1 2002 Q45
Inspection 9 Actuator Motor, Motor Relay, and Cir- Symptom 7: SLIP Indicator Lamp Does Not Illumi-
cuit ......................................................................... 57
. nate ........................................................................73
.
Inspection 10 Actuator Relay and Route ............... 59 . Symptom 8: During VDC/TCS/ABS Control, Vehicle
Inspection 11 Stop Lamp Switch and Path ............ 61 . Behavior is Jerky. ...................................................73 .
Inspection 12 VDC/TCS/ABS Control Unit Power WHEEL SENSORS ..................................................75 .
Supply Circuit ........................................................ 62 . Removal and Installation ........................................75 .
Inspection 13 If "Shift Position Error" is Indicated REMOVAL ...........................................................75 .
in the Self-Diagnosis Item Display ......................... 64 . INSTALLATION ...................................................75 .
Inspection 14 When "Emergency Brake" is Dis- VDC/TCS/ABS CONTROL UNIT .............................76 .
played in the Self-Diagnosis Item Display ............. 64 . Removal and Installation ........................................76 .
Inspection 15 When "Steering Wheel Angle Sensor SENSOR ROTOR .....................................................77 .
has not been Corrected" is Indicated in the Self- Removal and Installation ........................................77 .
Diagnosis Display .................................................. 65 . REMOVAL ...........................................................77 .
Inspection 16 Communication Circuit between INSTALLATION ...................................................77 .
Brake Fluid Level of Reservoir Tank, VDC/TCS/ABS VDC/TCS/ABS ACTUATOR .....................................78 .
Control Unit and Brake Fluid Level Switch ............ 65 . Removal and Installation ........................................78 .
Component Check ................................................. 66 . PRECHARGE PUMP ASSEMBLY ...........................79 .
VDC OFF SWITCH ............................................ 66 . Removal and Installation ........................................79 .
VDC RELAY BOX ............................................... 66 . REMOVAL ...........................................................79 .
VDC ACTUATOR ................................................ 67 . INSTALLATION ...................................................79 .
Symptom 1: ABS Works Frequently. ..................... 69 . G SENSOR ...............................................................80 .
Symptom 2: Unexpected Pedal Action .................. 69 . Removal and Installation ........................................80 .
Symptom 3: Longer Stopping Distance ................. 70 . REMOVAL ...........................................................80 .
Symptom 4: ABS Does Not Work. ......................... 71 . INSTALLATION ...................................................80 .
Symptom 5: Pedal Vibration and Noise ................. 71 . VDC/TCS/ABS RELAY BOX ....................................81 .
Symptom 6: VDC OFF Indicator Lamp Does Not Illu- Removal and Installation ........................................81 .
minate .................................................................... 72
.

Revision: 2004 April BRC-2 2002 Q45
PRECAUTIONS

PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EFS000NX

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. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual. C
WARNING:
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. D
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. E
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. BRC
Precautions for Brake System EFS000GV

q Use brake fluid "DOT 3". G
q Never reuse drained brake fluid.
q Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is splashed
on painted areas, wash it away with water immediately. H
q Never use mineral oils such as gasoline or kerosene. They will ruin rubber parts of hydraulic system.
q Use flare nut wrench when removing and installing brake tubes.
q Always torque brake lines when installing. I
q Before working, turn the ignition switch OFF and disconnect the
connectors for the ABS actuator and control module or the bat-
tery terminals. J
q Burnish the brake contact surfaces after refinishing or replacing
drums or rotors, after replacing pads or linings, or if a soft pedal
occurs at very low mileage. Refer to BR-25, "Brake Burnishing K
Procedure" .
WARNING: SBR686C
Clean brakes with a vacuum dust collector to minimize risk L
of health hazard from powder caused by friction.
Precautions for Brake Control EFS000GW

q During ABS operation, the brake pedal vibrates lightly and its mechanical noise may be heard. This is a M
normal condition.
q Just after starting the vehicle after ignition switch ON, the brake pedal may vibrate or the motor operating
noise may be heard from the engine compartment. This is a normal status of the operation check.
q The stopping distance may be longer than that of vehicles without ABS when the vehicle drives on rough,
gravel, or snowy (fresh deep snow) road.
q If a malfunction is indicated by the ABS warning lamp, or other warning lamps, collect the necessary infor-
mation from the customer (what symptoms are present under what conditions) and find out the possible
causes before starting the service. Besides the electrical system inspection, check the booster operation,
brake fluid level, and oil leaks.
q If the tire size and type are used in a improper combination, or the brake pads are not NISSAN genuine
parts, the stopping distance or steering stability may deteriorate.
q If there is a radio, antenna, or antenna lead-in wire (including wiring) near the control unit, the ABS func-
tion may have a malfunction or error.
q If aftermarket parts (e.g. Car stereo equipment, CD player) have been installed, check the electrical har-
nesses for pinches, open, and improper wiring.

Revision: 2004 April BRC-3 2002 Q45
PRECAUTIONS

Precautions for Trouble Diagnosis EFS001OW

CAN SYSTEM
q Do not apply voltage of 7.0V or higher to the measurement terminals.
q Use the tester with its open terminal voltage being 7.0V or less.
Precautions for Harness Repair EFS001OX

CAN SYSTEM
q Solder the repaired parts, and wrap with tape. [Frays of twisted
line must be within 110 mm (4.33 in)]

PKIA0306E

q Do not perform bypass wire connections for the repair parts.
(The spliced wire will become separated and the characteristics
of twisted line will be lost.)

PKIA0307E

Revision: 2004 April BRC-4 2002 Q45
ON-VEHICLE SERVICE

ON-VEHICLE SERVICE PFP:00000
A
Adjustment of Neutral Position of Steering Angle Sensor EFS000GY

q After removing/installing or replacing the VDC/TCS/ABS control unit, steering angle sensor, steering com-
ponents, suspension components, and tires, or after adjusting the wheel alignment, make sure to adjust B
the neutral position of the steering angle sensor before running the vehicle.
CAUTION:
To adjust the neutral position of the steering angle sensor, make sure to use CONSULT-II. C
(Adjustment cannot be done other than CONSULT-II.)
1. Stop the vehicle with the front wheels in the straight-ahead posi-
tion.
D
2. Connect CONSULT-II to data link connector on the vehicle, and
turn the ignition switch to ON position (engine not running).
3. Touch "VDC", "WORK SUPPORT" and "ANGLE SENSOR
E
ADJUSTMNET" on the CONSULT-II screen in this order.

BRC

PBIB0196E

4. Touch "START". G
CAUTION:
Do not touch the steering wheel while adjusting the steer-
ing angle sensor. H
5. After approximately 10 seconds, touch "END". (After approxi-
mately 60 seconds, it ends automatically.)
6. Turn the ignition switch OFF, then turn it ON again. I
CAUTION:
Make sure to carry out the above operation.
7. Run the vehicle with the front wheels in the straight-ahead posi- J
SFIA0168E
tion, then stop.
8. Select "DATA MONITOR", "CONTROL MODULE INPUT ITEM", and "STEERING ANGLE SIGNAL" on the
CONSULT-II screen. Then check that the "STEERING ANGLE SIGNAL" is within 0

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