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Nissan Murano Z50 (2006 year). Manual - part 78

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC-27

Revision: 2006 August

2006 Murano

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

PFP:18930

System Description

NBS002YO

INPUT/OUTPUT SIGNAL CHART

*: This signal is sent to the ECM through CAN communication line

BASIC ASCD SYSTEM

Refer to Owner's Manual for ASCD operating instructions.
Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed
without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/
h (25 MPH) and 144 km/h (89 MPH).
ECM controls throttle angle of electric throttle control actuator to regulate engine speed.
Operation status of ASCD is indicated by CRUISE indicator and SET indicator in combination meter. If any
malfunction occurs in ASCD system, it automatically deactivates control.
NOTE:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.

SET OPERATION

Press MAIN switch. (The CRUISE indicator in combination meter illuminates.)
When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89
MPH), press SET/COAST switch. (Then SET indicator in combination meter illuminates.)

ACCELERATE OPERATION

If the RESUME/ACCELERATE switch is pressed during cruise control driving, increase the vehicle speed until
the switch is released or vehicle speed reaches maximum speed controlled by the system.
And then ASCD will keep the new set speed.

CANCEL OPERATION

When any of following conditions exist, cruise operation will be canceled.

●

CANCEL switch is pressed.

●

More than 2 switches at ASCD steering switch are pressed at the same time (Set speed will be cleared.).

●

Brake pedal is depressed.

●

Shift lever is changed to N, P, R position.

●

Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed.

●

VDC/TCS system is operated.

●

CVT control system has a malfunction. Refer to

EC-537, "DTC P1700 CVT CONTROL SYSTEM"

When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform
the driver by blinking indicator lamp.

●

Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE lamp may
blink slowly.
When the engine coolant temperature decreases to the normal operating temperature, CRUISE lamp will
stop blinking and the cruise operation will be able to work by pressing SET/COAST switch or RESUME/
ACCELERATE switch.

●

Malfunction for some self-diagnoses regarding ASCD control: SET lamp will blink quickly.

If MAIN switch is turned to OFF during ASCD is activated, all of ASCD operations will be canceled and vehicle
speed memory will be erased.

Sensor

Input signal to ECM

ECM function

Actuator

ASCD brake switch

Brake pedal operation

ASCD vehicle speed control

Electric throttle control
actuator

Stop lamp switch

Brake pedal operation

ASCD steering switch

ASCD steering switch operation

Park/Neutral position (PNP)
switch

Gear position

Unified meter and A/C amp.

Vehicle speed*

TCM

Powertrain revolution*

EC-28

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Revision: 2006 August

2006 Murano

COAST OPERATION

When the SET/COAST switch is pressed during cruise control driving, decrease vehicle set speed until the
switch is released. And then ASCD will keep the new set speed.

RESUME OPERATION

When the RESUME/ACCELERATE switch is pressed after cancel operation other than pressing MAIN switch
is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition must
meet following conditions.

●

Brake pedal is released.

●

CVT shift lever is in other than P and N positions.

●

Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH).

Component Description

NBS002YP

ASCD STEERING SWITCH

Refer to

EC-520

ASCD BRAKE SWITCH

Refer to

EC-527

and

EC-610

STOP LAMP SWITCH

Refer to

EC-527

EC-547

and

EC-610

ELECTRIC THROTTLE CONTROL ACTUATOR

Refer to

and

ASCD INDICATOR

Refer to

EC-617

CAN COMMUNICATION

EC-29

Revision: 2006 August

2006 Murano

CAN COMMUNICATION

PFP:23710

System Description

NBS002YQ

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-25, "CAN COMMUNICATION"

, about CAN communication for detail.

EC-30

EVAPORATIVE EMISSION SYSTEM

Revision: 2006 August

2006 Murano

EVAPORATIVE EMISSION SYSTEM

PFP:14950

Description

NBS002YR

SYSTEM DESCRIPTION

The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the
engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the
engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is
proportionally regulated as the air flow increases.
EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating and
idling.

PBIB1631E

EVAPORATIVE EMISSION SYSTEM

EC-31

Revision: 2006 August

2006 Murano

EVAPORATIVE EMISSION LINE DRAWING

PBIB3191E

EC-32

EVAPORATIVE EMISSION SYSTEM

Revision: 2006 August

2006 Murano

PBIB1385E

EVAPORATIVE EMISSION SYSTEM

EC-33

Revision: 2006 August

2006 Murano

Component Inspection

NBS002YS

EVAP CANISTER

Check EVAP canister as follows:

Block port B .

Blow air into port A and check that it flows freely out of port C .

Release blocked port B .

Apply vacuum pressure to port B and check that vacuum pres-
sure exists at the ports A and C .

Block port A and B .

Apply pressure to port C and check that there is no leakage.

FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FULLER CAP)

Wipe clean valve housing.

Check valve opening pressure and vacuum.

If out of specification, replace fuel filler cap as an assembly.

CAUTION:

Use only a genuine fuel filler cap as a replacement. If an incor-
rect fuel filler cap is used, the MIL may come on.

EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to

EC-415

FUEL TANK TEMPERATURE SENSOR

Refer to

EC-337

EVAP CANISTER VENT CONTROL VALVE

Refer to

EC-421

EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to

EC-432

PBIB1044E

SEF445Y

Pressure:

15.3 - 20.0 kPa (0.156 - 0.204 kg/cm

, 2.22

- 2.90 psi)

Vacuum:

−

6.0 to

−

3.3 kPa (

−

0.061 to

−

0.034 kg/cm

−

0.87 to

−

0.48 psi)

SEF943S

EC-34

EVAPORATIVE EMISSION SYSTEM

Revision: 2006 August

2006 Murano

EVAP SERVICE PORT

Positive pressure is delivered to the EVAP system through the EVAP
service port. If fuel vapor leakage in the EVAP system occurs, use a
leak detector to locate the leak.

Removal and Installation

NBS002YT

EVAP CANISTER

Tighten EVAP canister as shown in the figure.

EVAP CANISTER VENT CONTROL VALVE

Turn EVAP canister vent control valve counterclockwise.

Remove the EVAP canister vent control valve.

Always reprece O-ring with a new one.

How to Detect Fuel Vapor Leakage

NBS002YU

CAUTION:

●

Never use compressed air or a high pressure pump.

●

Do not exceed 4.12 kPa (0.042 kg/cm

, 0.6 psi) of pressure in EVAP system.

NOTE:

●

Do not start engine.

●

Improper installation of EVAP service port adapter to the EVAP service port may cause a leak.

SEF462UA

PBIB1383E

PBIB1384E

EVAPORATIVE EMISSION SYSTEM

EC-35

Revision: 2006 August

2006 Murano

WITH CONSULT-II

Attach the EVAP service port adapter securely to the EVAP service port.

Also attach the pressure pump and hose to the EVAP service port adapter.

Turn ignition switch ON.

Select the “EVAP SYSTEM CLOSE” of “WORK SUPPORT
MODE” with CONSULT-II.

Touch “START”. A bar graph (Pressure indicating display) will
appear on the screen.

Apply positive pressure to the EVAP system until the pressure
indicator reaches the middle of the bar graph.

Remove EVAP service port adapter and hose with pressure
pump.

Locate the leak using a leak detector. Refer to

EC-31, "EVAPO-

RATIVE EMISSION LINE DRAWING"

WITHOUT CONSULT-II

Attach the EVAP service port adapter securely to the EVAP ser-
vice port.

Also attach the pressure pump with pressure gauge to the EVAP
service port adapter.

PEF838U

PEF917U

SEF200U

SEF462UA

EC-36

EVAPORATIVE EMISSION SYSTEM

Revision: 2006 August

2006 Murano

Apply battery voltage to the terminal of EVAP canister vent control valve to make a closed EVAP system.

To locate the leak, deliver positive pressure to the EVAP system until pressure gauge points reach 1.38 to
2.76 kPa (0.014 to 0.028 kg/cm

, 0.2 to 0.4 psi).

Remove EVAP service port adapter and hose with pressure pump.

Locate the leak using a leak detector. Refer to

EC-31, "EVAPORATIVE EMISSION LINE DRAWING"

PBIB1365E

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

EC-37

Revision: 2006 August

2006 Murano

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

PFP:00032

System Description

NBS002YV

From the beginning of refueling, the air and vapor inside the fuel tank go through refueling EVAP vapor cut
valve and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by the EVAP canister and the air is
released to the atmosphere.
When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and
refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged
during driving.

WARNING:

When conducting inspections below, be sure to observe the following:

●

Put a “CAUTION: INFLAMMABLE” sign in workshop.

●

Do not smoke while servicing fuel system. Keep open flames and sparks away from work area.

●

Be sure to furnish the workshop with a CO

fire extinguisher.

CAUTION:

●

Before removing fuel line parts, carry out the following procedures:

–

Put drained fuel in an explosion-proof container and put lid on securely.

–

Release fuel pressure from fuel line. Refer to Fuel Pressure Release,

EC-78

–

Disconnect battery ground cable.

●

Always replace O-ring when the fuel gauge retainer is removed.

●

Do not kink or twist hose and tube when they are installed.

●

Do not tighten hose and clamps excessively to avoid damaging hoses.

●

After installation, run engine and check for fuel leaks at connection.

●

Do not attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically.
Continued refueling may cause fuel overflow, resulting in fuel spray and possibly a fire.

PBIB1387E

EC-38

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

Revision: 2006 August

2006 Murano

Diagnostic Procedure

NBS002YW

SYMPTOM: FUEL ODOR FROM EVAP CANISTER IS STRONG.

CHECK EVAP CANISTER

Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.

Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.1 kg (4.6 lb).

OK or NG

>> GO TO 2.

>> GO TO 3.

CHECK IF EVAP CANISTER SATURATED WITH WATER

Does water drain from the EVAP canister?
Yes or No

Yes

>> GO TO 3.

>> GO TO 5.

REPLACE EVAP CANISTER

Replace EVAP canister with a new one.

>> GO TO 4.

DETECT MALFUNCTIONING PART

Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.

>> Repair or replace EVAP hose.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to

EC-40, "Component Inspection"

OK or NG

>> INSPECTION END

>> Replace refueling EVAP vapor cut valve with fuel tank.

PBIB1381E

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

EC-39

Revision: 2006 August

2006 Murano

SYMPTOM: CANNOT REFUEL/FUEL ODOR FROM THE FUEL FILLER OPENING IS STRONG
WHILE REFUELING.

CHECK EVAP CANISTER

Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.

Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.1 kg (4.6 lb).

OK or NG

>> GO TO 2.

>> GO TO 3.

CHECK IF EVAP CANISTER SATURATED WITH WATER

Does water drain from the EVAP canister?

Yes or No

Yes

>> GO TO 3.

>> GO TO 5.

REPLACE EVAP CANISTER

Replace EVAP canister with a new one.

>> GO TO 4.

DETECT MALFUNCTIONING PART

Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.

>> Repair or replace EVAP hose.

CHECK VENT HOSES AND VENT TUBES

Check hoses and tubes between EVAP canister and refueling EVAP vapor cut valve for clogging, kink, loose-
ness and improper connection.

OK or NG

>> GO TO 6.

>> Repair or replace hoses and tubes.

CHECK FILLER NECK TUBE

Check recirculation line for clogging, dents and cracks.

OK or NG

>> GO TO 7.

>> Replace filler neck tube.

PBIB1381E

EC-40

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

Revision: 2006 August

2006 Murano

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to

EC-40, "Component Inspection"

OK or NG

>> GO TO 8.

>> Replace refueling EVAP vapor cut valve with fuel tank.

CHECK FUEL FILLER TUBE

Check filler neck tube and hose connected to the fuel tank for clogging, dents and cracks.

OK or NG

>> GO TO 9.

>> Replace fuel filler tube.

CHECK ONE-WAY FUEL VALVE-I

Check one-way valve for clogging.

OK or NG

>> GO TO 10.

>> Repair or replace one-way fuel valve with fuel tank.

10.

CHECK ONE-WAY FUEL VALVE-II

Make sure that fuel is drained from the tank.

Remove fuel filler tube and hose.

Check one-way fuel valve for operation as follows.
When a stick is inserted, the valve should open, when removing
stick it should close.
Do not drop any material into the tank.

OK or NG

>> INSPECTION END

>> Replace fuel filler tube or replace one-way fuel valve

with fuel tank.

Component Inspection

NBS002YX

REFUELING EVAP VAPOR CUT VALVE

With CONSULT-II

Remove fuel tank. Refer to

FL-10, "FUEL TANK"

Drain fuel from the tank as follows:

Remove fuel feed hose located on the fuel gauge retainer.

Connect a spare fuel hose, one side to fuel gauge retainer where the hose was removed and the other
side to a fuel container.

Drain fuel using “FUEL PUMP RELAY” in “ACTIVE TEST” mode with CONSULT-II.

Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve (from the end of EVAP/ORVR line hose), and check that
the air flows freely into the tank.

Check refueling EVAP vapor cut valve for being stuck to open as follows.

Connect vacuum pump to hose end.

Remove fuel gauge retainer with fuel gauge unit.
Always replace O-ring with new one.

Put fuel tank upside down.

SEF665U

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

EC-41

Revision: 2006 August

2006 Murano

Apply vacuum pressure to hose end [

−

13.3 kPa (

−

100 mmHg,

−

3.94 inHg)] with fuel gauge retainer

remaining open and check that the pressure is applicable.

Without CONSULT-II

Remove fuel tank. Refer to

FL-10, "FUEL TANK"

Drain fuel from the tank as follows:

Remove fuel gauge retainer.

Drain fuel from the tank using a handy pump into a fuel container.

Check refueling EVAP vapor cut valve for being stuck to open as follows.

Connect vacuum pump to hose end.

Remove fuel gauge retainer with fuel gauge unit.
Always replace O-ring with new one.

Put fuel tank upside down.

Apply vacuum pressure to hose end [

−

13.3 kPa (

−

100 mmHg,

−

3.94 inHg)] with fuel gauge retainer

remaining open and check that the pressure is applicable.

PBIB1388E

EC-42

POSITIVE CRANKCASE VENTILATION

Revision: 2006 August

2006 Murano

POSITIVE CRANKCASE VENTILATION

PFP:11810

Description

NBS002YY

SYSTEM DESCRIPTION

This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake
manifold. During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the
PCV valve. Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of venti-
lating air. The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air
passes through the hose connecting air inlet tubes to rocker cover. Under full-throttle condition, the manifold
vacuum is insufficient to draw the blow-by flow through the valve. The flow goes through the hose connection
in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meet the requirement. This is because some of the flow will go
through the hose connection to the air inlet tubes under all condi-
tions.

Component Inspection

NBS002YZ

PCV (POSITIVE CRANKCASE VENTILATION) VALVE

With engine running at idle, remove PCV valve from rocker cover. A
properly working valve makes a hissing noise as air passes through
it. A strong vacuum should be felt immediately when a finger is
placed over valve inlet.

SEC921C

PBIB1588E

PBIB1589E

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