Nissan Murano Z50 (2004 year). Manual - part 106

 

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Nissan Murano Z50 (2004 year). Manual - part 106

 

 

VIAS

EC-607

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VIAS

PFP:14956

Description

ABS004S6

SYSTEM DESCRIPTION

*: ECM determines the start signal status by the signals of engine speed and battery voltage.

When the engine is running at medium speed, the ECM sends the ON signal to the VIAS control solenoid
valve. This signal introduces the intake manifold vacuum into the power valve actuator and therefore closes
the power valve.
Under this condition, the effective intake manifold length is equivalent to the total length of passage A and pas-
sage B. This long intake manifold provides increased amount of intake air, which results in improved suction
efficiency and higher torque.
When engine is running at low or high speed, the ECM sends the OFF signal to the VIAS control solenoid
valve and the power valve is opened.
Under this condition, the effective intake manifold length is equivalent to the length of passage B. This short-
ened intake manifold length results in enhanced engine output due to reduced suction resistance under high
speeds.

COMPONENT DESCRIPTION
Power Valve

The power valve is installed in intake manifold collector and used to
control the suction passage of the variable induction air control sys-
tem. It is set in the fully closed or fully opened position by the power
valve actuator operated by the vacuum stored in the surge tank. The
vacuum in the surge tank is controlled by the VIAS control solenoid
valve.

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

VIAS control

VIAS control solenoid valve

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Battery

Battery voltage*

PBIB1822E

PBIB1369E

EC-608

VIAS

Revision: 2004 November

2004 Murano

VIAS Control Solenoid Valve

The VIAS control solenoid valve cuts the intake manifold vacuum
signal for power valve control. It responds to ON/OFF signals from
the ECM. When the solenoid is off, the vacuum signal from the
intake manifold is cut. When the ECM sends an ON signal the coil
pulls the plunger downward and feeds the vacuum signal to the
power valve actuator.

CONSULT-II Reference Value in Data Monitor Mode

ABS004VR

Specification data are reference values.

PBIB1369E

MONITOR ITEM

CONDITION

SPECIFICATION

VIAS S/V

Engine: After warming up

1,800 - 3,600 rpm

ON

Except above conditions

OFF

VIAS

EC-609

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Wiring Diagram

ABS004S8

TBWA0724E

EC-610

VIAS

Revision: 2004 November

2004 Murano

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

29

G/Y

VIAS control solenoid valve

[Engine is running]

Idle speed

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

Engine speed is between 1,800 and 3,600 
rpm.

0 - 1.0V

111

W/B

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch: OFF]

For a few seconds after turning ignition 
switch OFF

0 - 1.5V

[Ignition switch: OFF]

A few seconds passed after turning ignition 
switch OFF

BATTERY VOLTAGE
(11 - 14V)

119

120

R/B
R/B

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

VIAS

EC-611

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Diagnostic Procedure

ABS004S9

1. 

CHECK OVERALL FUNCTION

 With CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode with CON-
SULT-II.

3.

Turn VIAS control solenoid valve “ON” and “OFF”, and make
sure that power valve actuator rod moves.

 Without CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Rev engine quickly up to above 5,000 rpm and make sure that
power valve actuator rod moves.

OK or NG

OK

>> INSPECTION END

NG (With CONSULT-II) >>GO TO 2.
NG (Without CONSULT-II) >>GO TO 3.

PBIB0844E

PBIB1380E

PBIB1380E

EC-612

VIAS

Revision: 2004 November

2004 Murano

2. 

CHECK VACUUM EXISTENCE

 With CONSULT-II

1.

Stop engine and disconnect vacuum hose connected to power valve actuator.

2.

Start engine and let it idle.

3.

Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode with CONSULT-II.

4.

Turn VIAS control solenoid valve “ON” and “OFF”, and check
vacuum existence under the following conditions.

OK or NG

OK

>> Repair or replace power valve actuator.

NG >> GO 

TO 

4.

3. 

CHECK VACUUM EXISTENCE

 Without CONSULT-II

1.

Stop engine and disconnect vacuum hose connected to power valve actuator.

2.

Disconnect VIAS control solenoid valve harness connector.

3.

Start engine and let it idle.

4.

Apply 12V of direct current between VIAS control solenoid valve
terminals 1 and 2.

5.

Check vacuum existence under the following conditions.

OK or NG

OK

>> Repair or replace power valve actuator.

NG

>> GO TO 4.

4. 

CHECK VACUUM HOSE

1.

Stop engine.

2.

Check hoses and tubes between intake manifold and power
valve actuator for crack, clogging, improper connection or dis-
connection. Refer to 

EC-23, "Vacuum Hose Drawing"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair hoses or tubes.

VIAS SOL VALVE

Vacuum

ON

Should exist.

OFF

Should not exist.

PBIB0844E

Condition

Vacuum

12V direct current supply

Should exist.

No supply

Should not exist.

PBIB0845E

SEF109L

VIAS

EC-613

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5. 

CHECK VACUUM TANK

Refer to 

EC-614, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Replace vacuum tank.

6. 

CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect VIAS control solenoid valve harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between terminal 1 and ground with CONSULT-II
or tester.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors E110, M7

Harness connectors M82, F102

IPDM E/R connector E7

Harness for open or short between VIAS control solenoid valve and IPDM E/R

Harness for open or short between VIAS control solenoid valve and ECM

>> Repair harness or connectors.

8. 

CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 29 and VIAS control solenoid valve terminal 2.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 9.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB1369E

Voltage: Battery voltage

PBIB0173E

Continuity should exist.

EC-614

VIAS

Revision: 2004 November

2004 Murano

9. 

CHECK VIAS CONTROL SOLENOID VALVE

Refer to 

EC-614, "Component Inspection"

 .

OK or NG

OK

>> GO TO 10.

NG

>> Replace VIAS control solenoid valve.

10. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-130, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

ABS004SA

VIAS CONTROL SOLENOID VALVE

 With CONSULT-II

1.

Reconnect harness connectors disconnected.

2.

Turn ignition switch ON.

3.

Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode.

4.

Check air passage continuity and operation delay time under the
following conditions.

Operation takes less than 1 second.

 Without CONSULT-II

Check air passage continuity and operation delay time under the fol-
lowing conditions.

Operation takes less than 1 second.

VACUUM TANK

1.

Disconnect vacuum hose connected to vacuum tank.

2.

Connect a vacuum pump to the port A of vacuum tank.

3.

Apply vacuum and make sure that vacuum exists at the port B.

Condition

VIAS SOL VALVE

Air passage continuity 

between A and B

Air passage continuity 

between A and C

ON

Yes

No

OFF

No

Yes

PBIB0177E

Condition

Air passage continuity 

between A and B

Air passage continuity 

between A and C

12V direct current supply 
between terminals 1 and 2

Yes

No

No supply

No

Yes

MEC488B

PBIB0846E

VIAS

EC-615

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Removal and Installation

ABS004SB

VIAS CONTROL SOLENOID VALVE

Refer to 

EM-21, "INTAKE MANIFOLD"

 .

EC-616

INJECTOR CIRCUIT

Revision: 2004 November

2004 Murano

INJECTOR CIRCUIT

PFP:16600

Component Description

ABS004OE

The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the injector circuit, the coil in the injector is
energized. The energized coil pulls the needle valve back and allows
fuel to flow through the injector into the intake manifold. The amount
of fuel injected depends upon the injection pulse duration. Pulse
duration is the length of time the injector remains open. The ECM
controls the injection pulse duration based on engine fuel needs.

CONSULT-II Reference Value in Data Monitor Mode

ABS004OF

Specification data are reference values.

SEF375Z

MONITOR ITEM

CONDITION

SPECIFICATION

B/FUEL SCHDL

See 

EC-126, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"

 .

INJ PULSE-B1
INJ PULSE-B2

Engine: After warming up

Shift lever: P or N

Air conditioner switch: OFF

No-load

Idle

2.0 - 3.0 msec

2,000 rpm

1.9 - 2.9 msec

INJECTOR CIRCUIT

EC-617

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Wiring Diagram

ABS004OG

TBWA0720E

EC-618

INJECTOR CIRCUIT

Revision: 2004 November

2004 Murano

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure

ABS004OH

1. 

INSPECTION START

Turn ignition switch to START.
Is any cylinder ignited?
Yes or No

Yes

>> GO TO 2.

No

>> GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

21
22
23

L/W
R/Y
R/B

Injector No. 5
Injector No. 3
Injector No. 1

[Engine is running]

Warm-up condition

Idle speed

NOTE:
The pulse cycle changes depending on rpm 
at idle.

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

Warm-up condition

Engine speed is 2,000 rpm.

BATTERY VOLTAGE

(11 - 14V)

40
41
42

R/G
L/Y
W/L

Injector No. 6
Injector No. 4 
Injector No. 2

[Engine is running]

Warm-up condition

Idle speed

NOTE:
The pulse cycle changes depending on rpm 
at idle.

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

Warm-up condition

Engine speed is 2,000 rpm

BATTERY VOLTAGE

(11 - 14V)

SEC984C

SEC985C

SEC984C

SEC985C

INJECTOR CIRCUIT

EC-619

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Revision: 2004 November

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2. 

CHECK OVERALL FUNCTION

 With CONSULT-II

1.

Start engine.

2.

Perform “POWER BALANCE” in “ACTIVE TEST” mode with
CONSULT-II.

3.

Make sure that each circuit produces a momentary engine
speed drop.

 Without CONSULT-II

1.

Start engine.

2.

Listen to each injector operating sound.
Clicking noise should be heard.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 3.

PBIB0133E

MEC703B

EC-620

INJECTOR CIRCUIT

Revision: 2004 November

2004 Murano

3. 

CHECK INJECTOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect injector harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between injector terminal 1 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors M82, F102

Harness connectors F29, F201

Fuse block (J/B) connector M1

10A fuse

Harness for open or short between injector and fuse

>> Repair harness or connectors.

5. 

CHECK INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between injector terminal 2 and ECM terminals 21, 22, 23, 40, 41, 42. 
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

Voltage: Battery voltage

PBIB1358E

PBIB0582E

Continuity should exist.

INJECTOR CIRCUIT

EC-621

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6. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors F201, F29

Harness for open or short between injector and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

7. 

CHECK INJECTOR

Refer to 

EC-621, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Replace injector.

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-130, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

ABS004OI

INJECTOR

1.

Disconnect injector harness connector.

2.

Check resistance between terminals as shown in the figure.

Removal and Installation

ABS004OJ

INJECTOR

Refer to 

EM-40, "FUEL INJECTOR AND FUEL TUBE"

 .

Resistance: 11.1 - 14.5

 [at 10 - 60

°

C (50 - 140

°

F)]

PBIB1727E

EC-622

FUEL PUMP CIRCUIT

Revision: 2004 November

2004 Murano

FUEL PUMP CIRCUIT

PFP:17042

Description

ABS004OK

SYSTEM DESCRIPTION

*: ECM determines the start signal status by the signals of engine speed and battery voltage.

The ECM activates the fuel pump for 1 second after the ignition switch is turned ON to improve engine start-
ability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows that
the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when the
ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging,
thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.

COMPONENT DESCRIPTION

A turbine type design fuel pump is used in the furl tank.

CONSULT-II Reference Value in Data Monitor Mode

ABS004OL

Specification data are reference values.

Sensor

Input Signal to ECM

ECM Function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

Fuel pump control

Fuel pump relay

Battery

Battery voltage*

Condition

Fuel pump operation

Ignition switch is turned to ON.

Operates for 1 second.

Engine running and cranking

Operates.

When engine is stopped

Stops in 1.5 seconds.

Except as shown above

Stops.

PBIB1356E

MONITOR ITEM

CONDITION

SPECIFICATION

FUEL PUMP RLY

For 1 second after turning ignition switch ON

Engine running or cranking

ON

Except above conditions

OFF

 

 

 

 

 

 

 

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