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BRAKE CONTROL SYSTEM

F BRAKES

SECTION
BRAKE CONTROL SYSTEM
BRC B

E
CONTENTS
VDC/TCS/ABS Wiring Diagram -- VDC -- .................................... 18 . BRC
Control Unit Input/Output Signal Standard ............ 26 .
PRECAUTIONS ......................................................... 3 . REFERENCE VALUE FROM CONSULT-II ........ 26 .
Precautions for Supplemental Restraint System CONSULT-II Functions .......................................... 27 . G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- CONSULT-II MAIN FUNCTION .......................... 27 .
SIONER" ................................................................. 3
. CONSULT-II BASIC OPERATION PROCEDURE
Precautions for Brake System ................................. 3 . ... 29
Precautions for Brake Control ................................. 3 . H
SELF-DIAGNOSIS ............................................. 29 .
Diagnosis Precaution .............................................. 4 . DATA MONITOR ................................................ 32 .
CAN SYSTEM ...................................................... 4 . ACTIVE TEST .................................................... 34 .
Precaution for Harness Repair ................................ 4 . Correct and Quick Diagnosis ................................. 38 . I
CAN SYSTEM ...................................................... 4 . DIAGNOSIS PRECAUTIONS ............................ 38 .
PREPARATION .......................................................... 5 . Basic Inspection .................................................... 40 .
Special Service Tools .............................................. 5 . BASIC INSPECTION 1 BRAKE FLUID AMOUNT, J
Commercial Service Tools ....................................... 5 . LEAKS, AND BRAKE PADS INSPECTION ........ 40 .
ON-VEHICLE SERVICE ............................................ 6 . BASIC INSPECTION 2 POWER SYSTEM TER-
Adjustment of Steering Angle Sensor Neutral Posi- MINAL LOOSENESS AND BATTERY INSPEC-
tion .......................................................................... 6
. K
TION ................................................................... 40
.
SYSTEM DESCRIPTION ........................................... 7 . BASIC INSPECTION 3 ABS WARNING LAMP,
System Diagram ...................................................... 7 . VDC OFF LAMP, SLIP LAMP INSPECTION ...... 40 .
VDC Function .......................................................... 7 . Inspection 1 Wheel Sensor System ....................... 41 . L
TCS Function .......................................................... 7 . INSPECTION PROCEDURE ............................. 41 .
ABS Function .......................................................... 8 . Inspection 2 Engine System .................................. 43 .
EBD Function .......................................................... 8 . Inspection 3 VDC/TCS/ABS Control Unit 1 ........... 43 . M
Fail-Safe Function ................................................... 8 . Inspection 4 Pressure Sensor System .................. 43 .
VDC / TCS SYSTEM ............................................ 8 . Inspection 5 Steering Angle Sensor System ......... 45 .
ABS, EBD SYSTEM ............................................. 8 . Inspection 6 Yaw Rate Sensor /Side G Sensor Sys-
Hydraulic Circuit Diagram ....................................... 9 . tem ......................................................................... 46
.
CAN COMMUNICATION ......................................... 10 . Inspection 7 Solenoid and VDC Change-Over Valve
System Description ............................................... 10 . System ................................................................... 48
.
CAN Communication Unit ..................................... 10 . Inspection 8 ABS Motor and Motor Relay System... 51
TYPE 1 ............................................................... 10
. Inspection 9 Solenoid Valve Relay System ........... 53 .
TYPE 2 ................................................................11
. Inspection 10 Stop Lamp Switch System .............. 54 .
TROUBLE DIAGNOSIS ........................................... 13 . Inspection 11 VDC/TCS/ABS Control Unit Power
How to Proceed With Diagnosis ............................ 13 . and Ground Systems ............................................. 55 .
BASIC CONCEPT .............................................. 13 . Inspection 12 VDC/TCS/ABS Control Unit 2 ......... 56 .
DIAGNOSIS FLOWCHART ............................... 14 . Inspection 13 Brake Fluid Level Sensor System ... 57
ASKING COMPLAINTS ..................................... 15 . Inspection 14 CAN Communication System .......... 58 .
EXAMPLE OF DIAGNOSIS SHEET .................. 15 . Inspection 15 When "SHIFT POSITION ERROR"
Component Installation Location ........................... 16 . Appears in Self-Diagnosis Results Display ........... 58 .
Schematic ............................................................. 17.

Revision; 2004 April BRC-1 2003 M45
Inspecting Components ......................................... 59 . VDC/TCS/ABS CONTROL UNIT .............................67 .
VDC OFF SWITCH ............................................ 59 . Removal and Installation ........................................67 .
VDC RELAY BOX ............................................... 59 . REMOVAL ...........................................................67
.
VDC ACTUATOR ................................................ 60 . INSTALLATION ...................................................67.
Symptom 1 Excessive ABS Function Operation Fre- SENSOR ROTOR .....................................................68 .
quency ................................................................... 61
. Removal and Installation ........................................68 .
Symptom 2 Unexpected Pedal Reaction ............... 62 . REMOVAL ...........................................................68
.
Symptom 3 The Braking Distance Is Long ............ 62 . INSTALLATION ...................................................68.
Symptom 4 The ABS Function Does Not Operate... 62 VDC/TCS/ABS ACTUATOR .....................................69 .
Symptom 5 Pedal Vibration or ABS Operation Removal and Installation ........................................69 .
Sound Occurs ........................................................ 63. G SENSOR ...............................................................70
.
Symptom 6 Vehicle Jerks During VDC/TCS/ABS Removal and Installation ........................................70 .
Control ................................................................... 63
. REMOVAL ...........................................................70
.
WHEEL SENSORS .................................................. 65 . INSTALLATION ...................................................70.
Removal and Installation ....................................... 65 . STEERING ANGLE SENSOR ..................................71 .
REMOVAL .......................................................... 65 . Removal and Installation ........................................71 .
INSTALLATION ................................................... 65 . REMOVAL ...........................................................71
.
INSTALLATION ...................................................71.

Revision; 2004 April BRC-2 2003 M45
PRECAUTIONS
[VDC/TCS/ABS]
PRECAUTIONS
[VDC/TCS/ABS] PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" AFS000KY

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 AFS000KZ

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 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 electri-
cal connectors of VDC actuator and control module or battery
terminals. L
q When installing brake piping, be sure to check torque.
SBR686C
M
Precautions for Brake Control AFS001JS

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 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.

Revision; 2004 April BRC-3 2003 M45
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, the VDC OFF lamp
and SLIP lamp may turn on or the VDC system may not operate properly. Components related to suspen-
sion (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.), Compo-
nents related to body reinforcement (Roll bar, Tower bar, etc.).
q Driving in the condition of breakage or excessive wear of the suspension, tires or components related to
the brakes may cause the VDC OFF lump and the SLIP 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 the
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 the VDC warning lamp may turn on.
However, this is not a problem if normal operation can be resumed after restarting the engine.
q Sudden turns (such as spin turns, acceleration turns), drifting, etc. When VDC function is OFF (VDC SW
ON) may cause the yaw rate/side G -sensor system indicate a problem. However this is not a problem if
normal operation can be resumed after restarting the engine.
Diagnosis Precaution AFS000L1

CAN SYSTEM
q Do not apply voltage of 7.0 V or higher to terminal to be measured.
q Maximum open terminal voltage of tester in use shall be 7.0 V or lower.
q Before checking harnesses, turn ignition switch to OFF and disconnect battery negative cable.
Precaution for Harness Repair AFS000L2

CAN SYSTEM
q Area to be repaired shall be soldered, and wrapped with a tape
[be sure that fraying of twisted wire shall be within 110 mm (4.33
in)].

PKIA0306E

q Do not make a bypass connection to repaired area. (If it is done,
branch part will be removed and characteristics of twisted wire
will be lost.)

PKIA0307E

Revision; 2004 April BRC-4 2003 M45
PREPARATION
[VDC/TCS/ABS]
PREPARATION PFP:00002
A
Special Service Tools AFS001I1

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
ST3072 000
(J25405)
Drift Installing rear sensor rotor. D
a: 76.5mm (3.012 in) dia.
b: 55.0mm (2.17 in) dia.
ZZC0760D
E

ST2786 3000 BRC
( -- ) Installing rear sensor rotor.
Drift

G
ZZC1307D

H
KV401 04710
( -- ) Installing rear sensor rotor.
Drift
I
ZZC1082D

Commercial Service Tools AFS000L3
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

Revision; 2004 April BRC-5 2003 M45
ON-VEHICLE SERVICE
[VDC/TCS/ABS]
ON-VEHICLE SERVICE PFP:00000

Adjustment of Steering Angle Sensor Neutral Position AFS000L4

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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