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Nissan Murano Z50 (2006 year). Manual - part 50

ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)

BRC-45

[ABS]

BRC

Revision: 2006 August

2006 Murano

ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)

PFP:47660

Removal and Installation

NFS000FX

Pay attention to the following when removing actuator.

CAUTION:

●

Before servicing, disconnect battery cables.

●

To remove brake tube, use flare nut wrench to prevent flare nuts and brake tube from being dam-
aged. To install, use flare nut torque wrench (commercial service tool).

●

Do not remove and install actuator by holding harness.

●

After work is completed, bleed air from brake piping. Refer to

BR-11, "Bleeding Brake System"

PFIA0800E

To front left

To rear right

To rear left

To front right

From master cylinder secondary
side

From master cylinder primary side

ABS actuator and electric unit (con-
trol unit)

Harness connector

BRC-46

[VDC/TCS/ABS]

PRECAUTIONS

Revision: 2006 August

2006 Murano

[VDC/TCS/ABS]

PRECAUTIONS

PFP:00001

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

NFS000FY

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:

●

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.

●

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.

●

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

NFS000FZ

●

Recommended fluid is brake fluid “DOT 3”. Refer to

MA-10, "RECOMMENDED FLUIDS AND LUBRI-

CANTS"

●

Never reuse drained brake fluid.

●

Be careful not to splash brake fluid on painted areas.

●

To clean or wash all parts of master cylinder, disc brake caliper and wheel cylinder, use clean brake fluid.

●

Never use mineral oils such as gasoline or kerosene. They will ruin rubber parts of the hydraulic system.

●

Use flare nut wrench when removing and installing brake tube.

●

When installing brake piping, be sure to torque.

●

Before working, turn ignition switch OFF and disconnect con-
nectors of ABS actuator and control unit or battery cables.

●

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:

●

Clean brake pads and shoes with a waste cloth, then wipe
with a dust collector.

Precautions for Brake Control

NFS000G0

●

During ABS operation, brake pedal lightly vibrates and a mechanical noise may be heard. This is normal.

●

Just after starting vehicle after turning 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.

●

Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.

●

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.

●

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.

●

If there is a radio, antenna, or antenna lead-in wire (including wiring) near control module, ABS function
may have a malfunction or error.

SBR686C

PRECAUTIONS

BRC-47

[VDC/TCS/ABS]

BRC

Revision: 2006 August

2006 Murano

●

If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness
pinches, open circuits, and improper wiring.

●

If the following components are replaced with non-genuine components or converted, the VDC OFF indi-
cator lamp and SLIP indicator lamp may turn on or the VDC system may not operate properly. Compo-
nents related to suspension (Shock Absorber, Strut, Spring, Bushing, 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.).

●

Driving in the condition of breakage or excessive wear of the suspension, tires or components related to
the brakes may cause the VDC OFF indicator lamp and the SLIP indicator lamp to turn on, and the VDC
system may not operate properly.

●

When the TCS or VDC is activated by sudden acceleration or sudden turn, some noise may occur. The
noise is a result of the normal operation of the TCS and VDC.

●

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 and the SLIP
indicator lamp may turn on. However, this is not a malfunction if normal operation can be resumed after
restarting the engine.

●

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 malfunction. However, this is not a malfunc-
tion if normal operation can be resumed after restarting the engine.

BRC-48

[VDC/TCS/ABS]

PREPARATION

Revision: 2006 August

2006 Murano

PREPARATION

PFP:00002

Commercial Service Tools

NFS000G1

Tool name

Description

1.Flare nut crowfoot
a:10 mm (0.39 in)/12 mm (0.47 in)
2.Torque wrench

Removing and installing each brake piping

S-NT360

ON-VEHICLE SERVICE

BRC-49

[VDC/TCS/ABS]

BRC

Revision: 2006 August

2006 Murano

ON-VEHICLE SERVICE

PFP:00000

Adjustment of Steering Angle Sensor Neutral Position

NFS000G2

After removing/installing or replacing ABS actuator and electric unit (control unit), steering angle sensor, steer-
ing components, suspension components, or after adjusting wheel alignment, make sure to adjust neutral
position of steering angle sensor before running vehicle.

: Required

–: Not required

CAUTION:

To adjust neutral position of steering angle sensor, make sure to use CONSULT-II.
(Adjustment can not be done without CONSULT-II.)

Stop vehicle with front wheels in straight-ahead position.

Perform “CONSULT-II SETTING PROCEDURE”. Refer to

BRC-

68, "CONSULT-II SETTING PROCEDURE"

Touch “WORK SUPPORT”.

Touch “START”on“ST ANGLE SENSOR ADJUSTMENT”screen.

CAUTION:

Do not touch steering wheel while adjusting steering angle
sensor.

After approximately 10 seconds, touch “END”. (After approxi-
mately 60 seconds, it ends automatically.)

Turn ignition switch OFF, then turn it ON again.

CAUTION:

Be sure to perform above operation.

Run vehicle with front wheels in straight-ahead position, then
stop.

Select “DATA MONITOR”, “SELECTION FROM MENU”, and “STR ANGLE SIG” on CONSULT-II screen.
Then make sure “STR ANGLE SIG” is within 0

2.5 deg. If value is more than specification, repeat steps 1

to 7.

Erase memory of ABS actuator and electric unit (control unit) and ECM.

10. Turn ignition switch OFF.

Situation

Adjustment of Steering Angle Sensor Neutral Position

Removing/Installing ABS actuator and electric unit (control unit)

–

Replacing ABS actuator and electric unit (control unit)

Removing/Installing steering angle sensor

Removing/Installing steering components

Removing/Installing suspension components

Change tires to new ones

–

Tire rotation

–

Adjustment wheel alignment

PBIB1300E

SFIA0371E

BRC-50

[VDC/TCS/ABS]

ON-VEHICLE SERVICE

Revision: 2006 August

2006 Murano

Calibration of Decel G Sensor

NFS000G3

After removing/installing or replacing yaw rate/side/decel G sensor, ABS actuator and electric unit (control
unit) make sure to Calibration of Decel G Sensor before running vehicle.

: Required

–: Not required

CAUTION:

To adjust neutral position of steering angle sensor, make sure to use CONSULT-II.
(Adjustment can not be done without CONSULT-II.)

Stop vehicle with front wheels in straight-ahead position.

CAUTION:

●

Keep all tires inflated to correct pressures. Adjust the tire
pressure to the specified pressure value.

●

See that there is on-load in vehicle other than the driver
(or equivalent weight placed in driver's position).

Perform “CONSULT-II SETTING PROCEDURE”. Refer to

BRC-

68, "CONSULT-II SETTING PROCEDURE"

Touch “WORK SUPPORT”.

Touch “START” on “DECEL G SEN CALIBRATION” on CON-
SULT- II screen.

After approximately 10 seconds, touch “END”. (After approxi-
mately 60 seconds, it ends automatically.)

Turn ignition switch OFF, then turn it ON again.

CAUTION:

Be sure to carry out above operation.

Run vehicle with front wheels in straight-ahead position, then
stop.

Select “DATA MONITOR”, “SELECTION FROM MENU”, and
“DECEL G SEN” on CONSULT- II screen. Then check that
“DECEL G SEN” is within

0.08 G. If value is more than specification, repeat steps 1 to 5.

Erase memory of ABS actuator and electric unit (control unit) and ECM.

10. Turn ignition switch OFF.

Situation

Calibration of Decel G Sensor

Removing/Installing ABS actuator and electric unit (control unit)

Removing/Installing steering components

–

Removing/Installing suspension components

–

Change tires to new ones

–

Tire rotation

–

Adjusting wheel alignment

–

Removing/Installing Yaw rate/side/decel G sensor

PBIB1300E

LFIA0171E

SYSTEM DESCRIPTION

BRC-51

[VDC/TCS/ABS]

BRC

Revision: 2006 August

2006 Murano

SYSTEM DESCRIPTION

PFP:00000

System Diagram

NFS000G4

COMPONENTS FUNCTION DESCRIPTION

Function

NFS000G6

VDC

●

In addition to the TCS/ABS function, the driver steering amount and brake operation amount are detected
from the steering angle sensor and pressure sensor, and the vehicle's driving status (amount of under
steering / over steering) is determined from information from the yaw rate side/decel G sensor, wheel sen-
sor, etc., and this information is used to improve vehicle stability by controlling the braking and engine
power to all four wheels.

●

The SLIP indicator lamp flashes to inform the driver of VDC operation.

●

During VDC operation, the body and brake pedal lightly vibrate and mechanical noises may be heard.
This is normal.

PFIA0740E

Components

Description

ABS actuator and electric unit
(control unit)

●

Receives the information of various sensor signals, engine and AT, and then determines the
vehicle driving status. Performs the calculations of target brake fluid pressure, of brake actuator
drive signal output and of engine torque required for the VDC/TCS/ABS control.

●

Receives the actuator drive signal from ABS actuator and electric unit (control unit), and then
performs the brake fluid adjustment of each wheel caliper.

Yaw rate side/decel G sensor

Detects the yaw rate and side G of the vehicle.

Steering angle sensor

Detects the operating angle and direction of driver steering wheel.

Wheel sensor

Detects the rotation speed of each wheel.

VDC OFF switch

Cancels the VDC function.

ECM

Receives the command from ABS actuator and electric unit (control unit), and then performs the
controls of throttle motor and injector.

BRC-52

[VDC/TCS/ABS]

SYSTEM DESCRIPTION

Revision: 2006 August

2006 Murano

●

The ABS warning lamp, VDC OFF indicator lamp, and SLIP indicator lamp might turn on when the vehicle
is subject to strong shaking or large vibration, such as when the vehicle is on a turn table or a ship while
the engine is running or steep slope such as bank. In this case, restart the engine on a normal road, and if
the ABS warning lamp, VDC OFF indicator lamp, and SLIP indicator lamp turn off, there is no malfunction.

TCS

●

The wheel spin of the drive wheels is detected by the ABS actuator and electric unit (control unit) from the
wheel speed signals from the four wheels, so if wheel spin occurs, the drive wheel right and left brake fluid
pressure control and engine fuel cut are conducted while the throttle value is restricted to reduce the
engine torque and decrease the amount of wheel spin. In addition, the degree the throttle is opened is
controlled to achieve the optimum engine torque.

●

Depending on road circumstances, the driver may have a sluggish feel. This is normal, because the opti-
mum traction has the highest priority under TCS operation.

●

TCS may be activated any time the vehicle suddenly accelerates, depressing accelerator peal fully, sud-
denly downshifts, upshifts, or is driven on a road with a varying surface friction coefficient.

●

During TCS operation, it informs a driver of system operation by flashing SLIP indicator lamp.

ABS

●

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.

●

If the electrical system malfunction, then Fail-Safe function is activated, ABS becomes inoperative, and
ABS warning lamp turns on.

●

Electrical system diagnosis by CONSULT-II is available.

●

During ABS operation, brake pedal lightly vibrates and a mechanical noise may be heard. This is normal.

●

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.

●

Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.

EBD

●

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.

●

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.

●

Electrical system diagnosis by CONSULT-II is available.

●

During EBD operation, brake pedal lightly vibrates and a mechanical noise may be heard. This is normal.

●

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.

●

Stopping distance may be longer than that of vehicles without EBD when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.

SYSTEM DESCRIPTION

BRC-53

[VDC/TCS/ABS]

BRC

Revision: 2006 August

2006 Murano

Hydraulic Circuit Diagram

NFS000GB

HYDRAULIC COMPONENTS FUNCTION DESCRIPTION

CAN Communication

NFS000GC

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-
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

Communication Unit"

PFIA0452E

Components

Description

Solenoid valve (ABS control valve)

Increases, maintains and decreases the fluid pressure of each caliper according to the signal
from VDC/TCS/ABS control unit.

Reservoir

When decreasing the caliper pressure, temporarily saves the brake fluid drained form the caliper
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 VDC/TCS/ABS control unit.

Inlet valve

Leaves the brake fluid drained from the reservoir to the pump so as not to return it to the reser-
voir.

Outlet valve

Leaves the brake fluid drained from the pump so as not to return it to the pump.

Return check valve

When releasing the brake, bypasses with the orifice of solenoid valve, and then refills the brake-
fluid of caliper to the master cylinder.

Damper

Controls the pulsation of brake fluid drained from the pump, and then weakens the pedal vibra-
tion during VDC/TCS/ABS operation.

VDC switch-over valve (CV)

Shuts out the normal brake passage from master cylinder during VDC/TCS operation.

VDC switch-over valve (SV)

Supplies the brake fluid from master cylinder to the pump during VDC/TCS operation.

BRC-54

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

Revision: 2006 August

2006 Murano

TROUBLE DIAGNOSIS

PFP:00004

Fail-Safe Function

NFS000LE

VDC/TCS SYSTEM

In case of malfunction with TCS, the VDC OFF indicator lamp and SLIP indicator lamp are turned on, and the
condition of the vehicle is the same as the condition of vehicles without VDC/TCS system. In case of malfunc-
tion with TCS, the ABS control continues to operate normally without VDC/TCS control.

CAUTION:

If the Fail-Safe function is activated, then perform the Self Diagnosis for VDC/TCS/ABS control sys-
tem.

ABS, EBD SYSTEM

In case of electrical malfunction with the ABS, the ABS warning lamp, VDC OFF indicator lamp and SLIP indi-
cator lamp will turn on. In case of electrical malfunction with the EBD, Brake warning lamp, ABS warning lamp,
VDC OFF indicator lamp and SLIP indicator lamp will turn on. Simultaneously, the VDC/TCS/ABS become one
of the following conditions of the Fail- Safe function.
1.

For ABS malfunction, only the EBD is activated and the condition of the vehicle is the same condition of
vehicles without TCS/ABS system.

For EBD malfunction, the EBD and ABS become inoperative, and the condition of the vehicle is the same
as the condition of vehicles without VDC/TCS/ABS, EBD system.

NOTE:
In condition 1 described above, an ABS Self Diagnosis sound may be heard. That is a normal condition
because a self diagnosis for “Key switch ON” and “The first starting” are being performed.

How to Perform Trouble Diagnosis for Quick and Accurate Repair

NFS000GD

INTRODUCTION

●

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

●

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”.

●

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.

●

After diagnosis, make sure to perform “erase memory”. Refer to

BRC-72, "How to Erase Self-Diagnostic Results"

●

For an intermittent malfunction, move harness or harness con-
nector by hand to check poor contact or false open circuit.

●

Always read “GI General Information” to confirm general precautions. Refer to

GI-4, "General Precau-

tions"

EFJ0028D

SEF233G

TROUBLE DIAGNOSIS

BRC-55

[VDC/TCS/ABS]

BRC

Revision: 2006 August

2006 Murano

DIAGNOSIS FLOW CHART

SFIA3272E

BRC-56

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

Revision: 2006 August

2006 Murano

ASKING COMPLAINTS

●

Complaints against malfunction vary depending on each person.
It is important to clarify customer complaints.

●

Ask customer about what symptoms are present and under
what conditions. Use information to reproduce symptom while
driving.

●

It is also important to use the diagnosis sheet so as not to miss
information.

EXAMPLE OF DIAGNOSIS SHEET

SBR339B

SFIA3264E

TROUBLE DIAGNOSIS

BRC-57

[VDC/TCS/ABS]

BRC

Revision: 2006 August

2006 Murano

Component Installation Location

NFS000GE

PFIA0744E

BRC-58

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

Revision: 2006 August

2006 Murano

Schematic

NFS000GF

TFWB0118E

TROUBLE DIAGNOSIS

BRC-59

[VDC/TCS/ABS]

BRC

Revision: 2006 August

2006 Murano

Wiring Diagram — VDC —

NFS000GG

TFWB0119E

BRC-60

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

Revision: 2006 August

2006 Murano

TFWB0038E

Content .. 48 49 50 51 ..