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BRAKE CONTROL SYSTEM

F BRAKES

SECTION
BRAKE CONTROL SYSTEM
BRC B

E
CONTENTS
ABS ACTIVE TEST .................................................... 26 . BRC
ABS ACTUATOR AND ELECTRIC UNIT (CON-
PRECAUTIONS ......................................................... 4 . TROL UNIT) PART NUMBER ............................ 27 .
Precautions for Supplemental Restraint System Trouble Diagnosis Chart for Symptoms ................. 27 . G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- For Fast and Accurate Diagnosis .......................... 28 .
SIONER" ................................................................. 4
. PRECAUTIONS FOR DIAGNOSIS .................... 28 .
Precautions for Brake System ................................. 4 . Basic Inspection .................................................... 29
.
Precautions for Brake Control ................................. 4 . H
BRAKE FLUID LEVEL, LEAKS, AND BRAKE
PREPARATION .......................................................... 6. PAD .................................................................... 29
.
Commercial Service Tools ....................................... 6 . POWER SYSTEM TERMINAL LOOSENESS
SYSTEM DESCRIPTION ........................................... 7 . AND BATTERY ................................................... 29 . I
System Diagram ...................................................... 7. ABS WARNING LAMP AND BRAKE WARNING
COMPONENTS FUNCTION DESCRIPTION ...... 7 . LAMP .................................................................. 29
.
Function .................................................................. 7
. TROUBLE DIAGNOSIS FOR SYSTEM ................... 30 . J
ABS ...................................................................... 7
. Wheel Sensor ........................................................ 30
.
EBD ...................................................................... 8
. INSPECTION PROCEDURE ............................. 30 .
Hydraulic Circuit Diagram ....................................... 8 . ABS Actuator and Electric Unit (Control Unit) ....... 33 .
HYDRAULIC COMPONENTS FUNCTION K
INSPECTION PROCEDURE ............................. 33 .
DESCRIPTION ..................................................... 8 . Solenoid Valve Circuit ............................................ 33 .
CAN Communication ............................................... 9 . INSPECTION PROCEDURE ............................. 33 .
SYSTEM DESCRIPTION ..................................... 9 . CAN Communication Circuit .................................. 34 . L
TROUBLE DIAGNOSIS ........................................... 10 . INSPECTION PROCEDURE ............................. 34 .
Fail-Safe Function ................................................. 10. Actuator Motor, Motor Relay, and Circuit ............... 35 .
ABS, EBD SYSTEM ........................................... 10 . INSPECTION PROCEDURE ............................. 35 . M
How to Perform Trouble Diagnosis for Quick and ABS Actuator and Electric Unit (Control Unit) Power
Accurate Repair .................................................... 10. Supply and Ground Circuit .................................... 36 .
INTRODUCTION ................................................ 10 . INSPECTION PROCEDURE ............................. 36 .
DIAGNOSIS FLOW CHART ...............................11 . G Sensor System .................................................. 37 .
ASKING COMPLAINTS ..................................... 12 . INSPECTION PROCEDURE ............................. 37 .
EXAMPLE OF DIAGNOSIS SHEET .................. 12 . Stop Lamp Switch .................................................. 38 .
Component Installation Location ........................... 13 . INSPECTION PROCEDURE ............................. 38 .
Schematic ............................................................. 14
. TROUBLE DIAGNOSIS FOR SYMPTOMS ............. 39 .
Wiring Diagram -- ABS -- .................................... 15 . Excessive ABS Function Operation Frequency ..... 39 .
Control Unit Input/Output Signal Standard ............ 19 . Unexpected Pedal Reaction .................................. 39 .
REFERENCE VALUE FROM CONSULT-II ........ 19 . The Braking Distance is Long ................................ 40 .
CONSULT- II Functions (ABS) .............................. 20 . ABS Function Dose Not Operate ........................... 40 .
CONSULT-II MAIN FUNCTION .......................... 20 . Pedal Vibration or ABS Operation Sound Occurs... 40
CONSULT-II SETTING PROCEDURE ............... 20 . ABS Warning Lamp Indication is Not Normal ........ 41 .
SELF-DIAG RESULT MODE ............................. 22 .
DATA MONITOR MODE .................................... 24 .

Revision: 2005 September BRC-1 2006 Murano
WHEEL SENSORS .................................................. 43
. ABS ACTUATOR AND ELECTRIC UNIT (CON-
Removal and Installation ....................................... 43
. TROL UNIT) PART NUMBER .............................76 .
REMOVAL .......................................................... 43
. Trouble Diagnosis Chart for Symptoms .................77 .
INSTALLATION ................................................... 43
. For Fast and Accurate Diagnosis ...........................78 .
SENSOR ROTOR ..................................................... 44
. PRECAUTIONS FOR DIAGNOSIS ....................78 .
Removal and Installation ....................................... 44
. Basic Inspection .....................................................79
.
REMOVAL .......................................................... 44
. BRAKE FLUID LEVEL, LEAKS, AND BRAKE
INSTALLATION ................................................... 44
. PADS ..................................................................79
.
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)... 45 POWER SYSTEM TERMINAL LOOSENESS
Removal and Installation ....................................... 45
. AND BATTERY ...................................................79 .
ABS WARNING LAMP, VDC OFF INDICATOR
VDC/TCS/ABS LAMP, BRAKE WARNING LAMP AND SLIP INDI-
CATOR LAMP .....................................................79 .
PRECAUTIONS ........................................................ 46 . TROUBLE DIAGNOSIS FOR SYSTEM ...................81 .
Precautions for Supplemental Restraint System Wheel Sensor ........................................................81
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- INSPECTION PROCEDURE ..............................81 .
SIONER" ................................................................ 46. Engine System Control Signal ...............................83 .
Precautions for Brake System ............................... 46 . INSPECTION PROCEDURE ..............................83 .
Precautions for Brake Control ............................... 46 . ABS Actuator and Electric Unit (Control Unit) ........84 .
PREPARATION ........................................................ 48 . INSPECTION PROCEDURE ..............................84 .
Commercial Service Tools ..................................... 48 . Pressure Sensor ....................................................84.
ON-VEHICLE SERVICE ........................................... 49 . INSPECTION PROCEDURE ..............................84 .
Adjustment of Steering Angle Sensor Neutral Posi- Steering Angle Sensor ...........................................85 .
tion ......................................................................... 49
. INSPECTION PROCEDURE ..............................85 .
Calibration of Decel G Sensor ............................... 50 . Yaw Rate/Side/Decel G Sensor .............................87 .
SYSTEM DESCRIPTION ......................................... 51 . INSPECTION PROCEDURE ..............................87 .
System Diagram .................................................... 51 . Solenoid and VDC Change-Over Valve .................89 .
COMPONENTS FUNCTION DESCRIPTION ..... 51 . INSPECTION PROCEDURE ..............................89 .
Function ................................................................. 51
. Actuator Motor and Motor Relay ............................90 .
VDC .................................................................... 51
. INSPECTION PROCEDURE ..............................90 .
TCS .................................................................... 52
. ABS Actuator and Electric Unit (Control Unit) Power
ABS .................................................................... 52
. Supply and Ground Circuit .....................................91 .
EBD .................................................................... 52
. INSPECTION PROCEDURE ..............................91 .
Hydraulic Circuit Diagram ...................................... 53 . Stop Lamp Switch ..................................................93 .
HYDRAULIC COMPONENTS FUNCTION INSPECTION PROCEDURE ..............................93 .
DESCRIPTION ................................................... 53 . Brake Fluid Level Switch ........................................93 .
CAN Communication ............................................. 53 . INSPECTION PROCEDURE ..............................93 .
SYSTEM DESCRIPTION ................................... 53 . VDC OFF Switch ....................................................95 .
TROUBLE DIAGNOSIS ........................................... 54 . INSPECTION PROCEDURE ..............................95 .
Fail-Safe Function ................................................. 54 . CAN Communication Circuit ..................................96 .
VDC/TCS SYSTEM ............................................ 54 . INSPECTION PROCEDURE ..............................96 .
ABS, EBD SYSTEM ........................................... 54 . Component Inspection ...........................................96 .
How to Perform Trouble Diagnosis for Quick and VDC OFF SWITCH .............................................96 .
Accurate Repair ..................................................... 54 . BRAKE FLUID LEVEL SWITCH .........................97 .
INTRODUCTION ................................................ 54 . TROUBLE DIAGNOSIS FOR SYMPTOMS .............98 .
DIAGNOSIS FLOW CHART ............................... 55 . Excessive ABS Function Operation Frequency .....98 .
ASKING COMPLAINTS ...................................... 56 . Unexpected Pedal Reaction ..................................98 .
EXAMPLE OF DIAGNOSIS SHEET ................... 56 . The Braking Distance is Long ................................99 .
Component Installation Location ........................... 57 . ABS Function Does Not Operate ...........................99 .
Schematic .............................................................. 58. Pedal Vibration or ABS Operation Sound Occurs ...99
Wiring Diagram -- VDC -- .................................... 59 . Vehicle Jerks During VDC/TCS/ABS Control ....... 100 .
Control Unit Input/Output Signal Standard ............. 65 . ABS Warning Lamp Indication is Not Normal ...... 100 .
REFERENCE VALUE FROM CONSULT-II ........ 65 . Slip Indicator Lamp Indication is Not Normal ....... 101 .
CONSULT-II Functions (ABS) ................................ 67 . VDC OFF Indicator Lamp Indication is Not Normal.102
CONSULT-II MAIN FUNCTION .......................... 67 . WHEEL SENSORS ................................................ 103 .
CONSULT-II SETTING PROCEDURE ............... 68 . Removal and Installation ...................................... 103 .
SELF-DIAG RESULT MODE .............................. 70 . REMOVAL ......................................................... 103
.
DATA MONITOR MODE ..................................... 72 . INSTALLATION ................................................. 103 .
ACTIVE TEST .................................................... 75 .

Revision: 2005 September BRC-2 2006 Murano
SENSOR ROTOR .................................................. 104
. G SENSOR ............................................................. 107
.
Removal and Installation ..................................... 104
. Removal and Installation ..................................... 107 . A
REMOVAL ........................................................ 104
. REMOVAL ........................................................ 107
.
INSTALLATION ................................................ 104
. INSTALLATION ................................................ 107 .
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY). 105 STEERING ANGLE SENSOR ............................... 108 . B
Removal and Installation ..................................... 105
. Removal and Installation ..................................... 108 .

BRC

Revision: 2005 September BRC-3 2006 Murano
PRECAUTIONS
[ABS]
PRECAUTIONS
[ABS] PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" NFS000F0

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
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
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:
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.
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.
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.
Precautions for Brake System NFS000F1

q Recommended fluid is brake fluid "DOT 3". Refer toMA-10, "RECOMMENDED FLUIDS AND LUBRI-
CANTS" .
q Never reuse drained brake fluid.
q Be careful not to splash brake fluid on painted areas.
q To clean or wash all parts of master cylinder, disc brake caliper and wheel cylinder, use clean brake fluid.
q Never use mineral oils such as gasoline or kerosene. They will ruin rubber parts of the hydraulic system.
q Use flare nut wrench when removing and installing brake tube.
q Always torque brake lines when installing.
q Before working, turn ignition switch OFF and disconnect electri-
cal connectors of ABS actuator and electric control unit or bat-
tery cables.
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-30, "BRAKE BURNISHING PROCEDURE" .
WARNING: SBR686C
Clean brake pads and shoes with a waste cloth, then wipe with
a dust collector.
Precautions for Brake Control NFS000F2

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 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 control module, ABS function
may have a malfunction or error.

Revision: 2005 September BRC-4 2006 Murano
PRECAUTIONS
[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. A

BRC

Revision: 2005 September BRC-5 2006 Murano
PREPARATION
[ABS]
PREPARATION PFP:00002

Commercial Service Tools NFS000F3

Tool name Description
1.Flare nut crowfoot Removing and installing each brake piping
a:10 mm (0.39 in)/12 mm (0.47 in)
2.Torque wrench

S-NT360

Revision: 2005 September BRC-6 2006 Murano
SYSTEM DESCRIPTION
[ABS]
SYSTEM DESCRIPTION PFP:00000
A
System Diagram NFS000F4

BRC

PFIA0739E

COMPONENTS FUNCTION DESCRIPTION J
Components Description
q Receives the information of various sensor signals and then determines the vehicle driving
status. Performs the calculations of target brake fluid pressure, of brake actuator drive signal K
ABS actuator and electric unit (con- output for the ABS control.
trol unit)
q Receives the actuator drive signal from ABS actuator and electric unit (control unit), and then
performs the brake fluid adjustment of each wheel caliper. L
Decel G sensor (Only AWD models) Detects the G of the vehicle.
Wheel sensor Detects the rotation speed of each wheel.
M
Function NFS000F6

ABS
q The Anti-Lock Brake System is a function that detects wheel revolution while braking, and it improves
handling stability during sudden braking by electrically preventing 4 wheel lock. Maneuverability is also
improved for avoiding obstacles.
q If the electrical system malfunctions, then fail-safe function is activated, ABS becomes inoperative, and
ABS warning lamp turns on.
q Electrical system diagnosis by CONSULT-II is available.
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.

Revision: 2005 September BRC-7 2006 Murano
SYSTEM DESCRIPTION
[ABS]
EBD
q Electronic Brake Distribution is a function that detects subtle slippages between front and rear wheels dur-
ing braking, and it improves handling stability by electronically controlling Brake Fluid Pressure which
results in reduced rear wheel slippage.
q In case of electrical system malfunction, fail-safe function is activated, EBD and ABS becomes inopera-
tive, and ABS warning lamp and brake warning lamp are turned on.
q Electrical system diagnosis by CONSULT-II is available.
q During EBD 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 EBD when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.
Hydraulic Circuit Diagram NFS000F9

PFIA0422E

HYDRAULIC COMPONENTS FUNCTION DESCRIPTION
Components Description
Increases, maintains and decreases the fluid pressure of each caliper according to the signal
Solenoid valve (ABS control valve)
from ABS actuator and electric unit (control unit).
When decreasing the caliper pressure, temporarily saves the brake fluid drained form the caliper
Reservoir
in order to perform the work efficiently.
Pump Refills the brake fluid saved in the reservoir via the damper to the caliper.
Motor Operates the pump according to the signal from ABS actuator and electric unit (control unit).
Leaves the brake fluid drained from the reservoir to the pump so as not to return it to the reser-
Inlet valve
voir.

Revision: 2005 September BRC-8 2006 Murano
SYSTEM DESCRIPTION
[ABS]
Components Description
A
Outlet valve Leaves the brake fluid drained from the pump so as not to return it to the pump.
When releasing the brake, bypasses with the orifice of solenoid valve, and then refills the brake-
Return check valve
fluid of caliper to the master cylinder.
B
Controls the pulsation of brake fluid drained from the pump, and then weakens the pedal vibra-
Damper
tion during ABS operation.

CAN Communication NFS000FA C
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec- D
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. Refer to LAN-32, "CAN E
Communication Unit" .

BRC

Revision: 2005 September BRC-9 2006 Murano
TROUBLE DIAGNOSIS
[ABS]
TROUBLE DIAGNOSIS PFP:00004

Fail-Safe Function NFS000LL

ABS, EBD SYSTEM
In case of electrical malfunctions with ABS, ABS warning lamp will turn on. In case of electrical malfunctions
with EBD, brake warning lamp and ABS warning lamp will turn on. Simultaneously, ABS become one of follow-
ing conditions of Fail-Safe function.
1. For ABS malfunction, only EBD is activated and condition of vehicle is same condition of vehicles without
ABS system.
2. For EBD malfunction, EBD and ABS become inoperative, and condition of vehicle is same as condition of
vehicles without ABS, EBD system.
NOTE:
In step 1 shown above, self-diagnosis when ignition switch is turned ON and when vehicle starts at initial time
is performed. ABS self-diagnosis noise may be hard as usual.
How to Perform Trouble Diagnosis for Quick and Accurate Repair NFS000FB

INTRODUCTION
q Most important point to perform diagnosis is to understand systems (control and mechanism) in vehicle
thoroughly.

q It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptom, and understand it fully.
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptom by driving vehicle with
customer.
NOTE:
Customers are not professionals. Do not assume "maybe cus-
tomer means..." or "maybe customer mentioned this symptom".

EFJ0028D

q It is essential to check symptoms right from beginning in order to
repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce
symptom based on interview with customer and past examples.
Do not perform inspection on ad hoc basis. Most intermittent
malfunctions are caused by poor contacts. In this case, it will be
effective to shake suspected harness or connector by hand.
When repairs are performed without any symptom check, no
one can judge if malfunction has actually been eliminated.
q After diagnosis, make sure to perform "erase memory". Refer to
BRC-23, "How to Erase Self-Diagnostic Results" . SEF233G

q For an intermittent malfunction, move harness or harness con-
nector by hand to check poor contact or false open circuit.
q Always read "GI General Information" to confirm general precautions. Refer to GI-4, "General Precau-
tions" .

Revision: 2005 September BRC-10 2006 Murano
TROUBLE DIAGNOSIS
[ABS]
DIAGNOSIS FLOW CHART
A

BRC

SFIA3270E

Revision: 2005 September BRC-11 2006 Murano
TROUBLE DIAGNOSIS
[ABS]
ASKING COMPLAINTS
q Complaints against malfunction vary depending on each person.
It is important to clarify customer complaints.
q Ask customer about what symptoms are present and under
what conditions. Use information to reproduce symptom while
driving.
q It is also important to use the diagnosis sheet so as not to miss
information.

SBR339B

EXAMPLE OF DIAGNOSIS SHEET

SFIA3264E

Revision: 2005 September BRC-12 2006 Murano
TROUBLE DIAGNOSIS
[ABS]
Component Installation Location NFS000FC

BRC

PFIA0741E

Revision: 2005 September BRC-13 2006 Murano
TROUBLE DIAGNOSIS
[ABS]
Schematic NFS000FD

TFWB0121E

Revision: 2005 September BRC-14 2006 Murano
TROUBLE DIAGNOSIS
[ABS]
Wiring Diagram -- ABS -- NFS000FE

BRC

TFWB0117E

Revision: 2005 September BRC-15 2006 Murano
TROUBLE DIAGNOSIS
[ABS]

TFWB0035E

Revision: 2005 September BRC-16 2006 Murano
TROUBLE DIAGNOSIS
[ABS]

BRC

TFWB0036E

Revision: 2005 September BRC-17 2006 Murano
TROUBLE DIAGNOSIS
[ABS]

TFWA0064E

Revision: 2005 September BRC-18 2006 Murano
TROUBLE DIAGNOSIS
[ABS]
Control Unit Input/Output Signal Standard NFS000FF

REFERENCE VALUE FROM CONSULT-II A
CAUTION:
The display shows control unit calculation data, so a normal value might be displayed even in the
event the output circuit (harness) is open or short - circuited. B
Data monitor
Monitor item Display content Reference value in Check item
Condition C
normal operation
Vehicle stopped 0 [km/h]
FR RH SENSOR
FR LH SENSOR Almost in accor-
Wheel speed dance with speed- BRC-30, "Wheel Sensor" D
RR RH SENSOR Vehicle running (Note 1)
RR LH SENSOR ometer display
(within

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