Nissan Murano Z51 (2008 year). Manual - part 138

 

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Nissan Murano Z51 (2008 year). Manual - part 138

 

 

EC-24

< FUNCTION DIAGNOSIS >

[VQ35DE]

ENGINE CONTROL SYSTEM

JMBIA1832GB

1.

A/F sensor 1 (bank 1) harness con-
nector

2.

A/F sensor 1 (bank 1)

3.

A/F sensor 1 (bank 2) harness con-
nector

4.

A/F sensor 1 (bank 2)

: Vehicle front

1.

HO2S2 (bank 1)

2.

HO2S2 (bank 2)

3.

HO2S2 (bank 2) harness connector

4.

HO2S2 (bank 1) harness connector

5.

Power steering pressure sensor

6.

Drive shaft (RH)

: Vehicle front

JMBIA1116ZZ

JMBIA1117ZZ

Revision: 2008 October

2009 Murano

ENGINE CONTROL SYSTEM

EC-25

< FUNCTION DIAGNOSIS >

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1.

Electronic controlled engine mount 
control solenoid valve

2.

VIAS control solenoid valve 1

3.

VIAS control solenoid valve 2

4.

EVAP canister purge volume control 
solenoid valve

5.

EVAP service port

6.

EVAP control system pressure sen-
sor

7.

EVAP canister vent control valve

8.

EVAP canister

: Vehicle front

1.

Intake valve timing control solenoid 
valve (bank 1)

2.

Intake valve timing control solenoid 
valve (bank 2)

3.

Data link connector

1.

Stop lamp switch

2.

ASCD brake switch

3.

Accelerator pedal position sensor

JMBIA1111ZZ

JMBIA1118ZZ

JMBIA1119ZZ

JMBIA1120ZZ

Revision: 2008 October

2009 Murano

EC-26

< FUNCTION DIAGNOSIS >

[VQ35DE]

ENGINE CONTROL SYSTEM

Component Description

INFOID:0000000003387888

1.

ASCD steering switch

2.

CANSEL switch

3.

RESUME/ACCELERATE switch

4.

SET/COAST switch

5.

MAIN switch

1.

Fuel level sensor unit and fuel pump 
harness connector

2.

Fuel level sensor unit and fuel pump 3.

Fuel pressure regulator

: Vehicle front

JMBIA1121ZZ

Component

Reference

A/F sensor 1

EC-186, "Description"

A/F sensor 1 heater

EC-145, "Description"

Accelerator pedal position sensor

EC-413, "Description"

ASCD brake switch

EC-380, "Description"

ASCD steering switch

EC-377, "Description"

Battery current sensor

EC-365, "Description"

Camshaft position sensor (PHASE)

EC-264, "Description"

Cooling fan motor

EC-434, "Description"

Crankshaft position sensor (POS)

EC-260, "Description"

Electric throttle control actuator

EC-411, "Description"

Electronic controlled engine mount

EC-441, "Description"

Engine coolant temperature sensor

EC-170, "Description"

Engine oil temperature sensor

EC-242, "Description"

EVAP canister purge volume control solenoid valve

EC-284, "Description"

EVAP canister vent control valve

EC-292, "Description"

EVAP control system pressure sensor

EC-300, "Description"

Fuel injector

EC-444, "Description"

Fuel level sensor

EC-327, "Description"

Fuel pump

EC-447, "Description"

Fuel tank temperature sensor

EC-236, "Description"

Heated oxygen sensor 2

EC-203, "Description"

Heated oxygen sensor 2 heater

EC-148, "Description"

Ignition coil with power transistor

EC-451, "Description"

Intake air temperature sensor

EC-167, "Description"

Intake valve timing control solenoid valve

EC-151, "Description"

Knock sensor

EC-257, "Description"

Mass air flow sensor

EC-154, "Description"

Revision: 2008 October

2009 Murano

ENGINE CONTROL SYSTEM

EC-27

< FUNCTION DIAGNOSIS >

[VQ35DE]

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PCV valve

EC-462, "Description"

Power steering pressure sensor

EC-339, "Description"

Power valves 1 and 2

EC-466, "Description"

Refrigerant pressure sensor

EC-463, "Description"

Stop lamp switch

EC-399, "Description"

TCM

EC-350, "Description"

Throttle control motor

EC-408, "Description"

Throttle control motor relay

EC-402, "Description"

Throttle position sensor

EC-175, "Description"

VIAS control solenoid valve 1

EC-393, "Description"

VIAS control solenoid valve 2

EC-396, "Description"

Component

Reference

Revision: 2008 October

2009 Murano

EC-28

< FUNCTION DIAGNOSIS >

[VQ35DE]

MULTIPORT FUEL INJECTION SYSTEM

MULTIPORT FUEL INJECTION SYSTEM

System Diagram

INFOID:0000000003387889

System Description

INFOID:0000000003387890

INPUT/OUTPUT SIGNAL CHART

*1: This sensor is not used to control the engine system under normal conditions.

*2: This signal is sent to the ECM via the CAN communication line.

JMBIA1833GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed*

3

Piston position

Fuel injection 
& mixture ratio 
control

Fuel injector

Camshaft position sensor (PHASE)

Mass air flow sensor

Amount of intake air

Intake air temperature sensor

Intake air temperature

Engine coolant temperature sensor

Engine coolant temperature

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

TCM

Gear position

Battery

Battery voltage*

3

Knock sensor

Engine knocking condition

Power steering pressure sensor

Power steering operation

Heated oxygen sensor 2*

1

Density of oxygen in exhaust gas

ABS actuator and electric unit (control unit)

VDC/TCS operation command*

2

Combination meter

Vehicle speed*

2

BCM

Air conditioner operation*

2

Revision: 2008 October

2009 Murano

MULTIPORT FUEL INJECTION SYSTEM

EC-29

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

SYSTEM DESCRIPTION

The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from the crankshaft position sensor (POS), camshaft position
sensor (PHASE) and the mass air flow sensor.

VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION

In addition, the amount of fuel injected is compensated to improve engine performance under various operat-
ing conditions as listed below.

<Fuel increase>

• During warm-up
• When starting the engine
• During acceleration
• Hot-engine operation
• When selector lever position is changed from N to D
• High-load, high-speed operation

<Fuel decrease>

• During deceleration
• During high engine speed operation

MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)

The mixture ratio feedback system provides the best air-fuel mixture ratio for drive ability and emission control.
The three way catalyst (manifold) can better reduce CO, HC and NOx emissions. This system uses A/F sen-
sor 1 in the exhaust manifold to monitor whether the engine operation is rich or lean. The ECM adjusts the
injection pulse width according to the sensor voltage signal. For more information about A/F sensor 1, refer to

EC-186, "Description"

. This maintains the mixture ratio within the range of stoichiometric (ideal air-fuel mix-

ture).
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 is located downstream of the three way catalyst (manifold). Even if the switching
characteristics of A/F sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal from heated
oxygen sensor 2.
• Open Loop Control

The open loop system condition refers to when the ECM detects any of the following conditions. Feedback
control stops in order to maintain stabilized fuel combustion.

- Deceleration and acceleration
- High-load, high-speed operation
- Malfunction of A/F sensor 1 or its circuit
- Insufficient activation of A/F sensor 1 at low engine coolant temperature
- High engine coolant temperature
- During warm-up
- After shifting from N to D
- When starting the engine

MIXTURE RATIO SELF-LEARNING CONTROL

The mixture ratio feedback control system monitors the mixture ratio signal transmitted from A/F sensor 1.
This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to the theoret-
ical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as originally

PBIB3020E

Revision: 2008 October

2009 Murano

EC-30

< FUNCTION DIAGNOSIS >

[VQ35DE]

MULTIPORT FUEL INJECTION SYSTEM

designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic changes dur-
ing operation (i.e., fuel injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is
then computed in terms of “injection pulse duration” to automatically compensate for the difference between
the two ratios.
“Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim
includes “short-term fuel trim” and “long-term fuel trim”.
“Short-term fuel trim” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical
value. The signal from A/F sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the the-
oretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an increase in
fuel volume if it is lean.
“Long-term fuel trim” is overall fuel compensation carried out over time to compensate for continual deviation
of the “short-term fuel trim” from the central value. Continual deviation will occur due to individual engine differ-
ences, wear over time and changes in the usage environment.

FUEL INJECTION TIMING

Two types of systems are used.
• Sequential Multiport Fuel Injection System

Fuel is injected into each cylinder during each engine cycle according to the ignition order. This system is
used when the engine is running.

• Simultaneous Multiport Fuel Injection System

Fuel is injected simultaneously into all six cylinders twice each engine cycle. In other words, pulse signals of
the same width are simultaneously transmitted from the ECM.
The six injectors will then receive the signals 2 times for each engine cycle.
This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.

FUEL SHUT-OFF

Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or oper-
ation of the vehicle at excessively high speeds.

SEF179U

Revision: 2008 October

2009 Murano

MULTIPORT FUEL INJECTION SYSTEM

EC-31

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Component Parts Location

INFOID:0000000003573769

1.

Intake valve timing control solenoid 
valve (bank 1)

2.

Intake valve timing control solenoid 
valve (bank 2)

3.

Electronic controlled engine mount 
control solenoid valve

4.

Fuel injector (bank 2)

5.

A/F sensor 1 (bank 2)

6.

Cooling fan motor-2

7.

Ignition coil (with power transistor) 
and spark plug (bank 2)

8.

Camshaft position sensor (PHASE) 
(bank 2)

9.

Crankshaft position sensor (POS)

10. Engine coolant temperature sensor

11.

Cooling fan motor-1

12. ECM

13. Refrigerant pressure sensor

14. Battery current sensor

15. IPDM E/R

16. Mass air flow sensor (with intake air 

temperature sensor)

17. Electric throttle control actuator

18. EVAP service port

19. Power valve actuator 2

20. EVAP canister purge volume control 

solenoid valve

21. Camshaft position sensor (PHASE) 

(bank 1)

22. Ignition coil (with power transistor) 

and spark plug (bank 1)

23. A/F sensor 1 (bank 1)

24. Fuel injector (bank 1)

25. VIAS control solenoid valve 1 and 2

26. Power valve actuator 1

JMBIA1108ZZ

Revision: 2008 October

2009 Murano

EC-32

< FUNCTION DIAGNOSIS >

[VQ35DE]

MULTIPORT FUEL INJECTION SYSTEM

1.

Mas air flow sensor (with intake air 
temperature sensor)

2.

Electric throttle control actuator

: Vehicle front

1.

Ignition coil (with power transistor) 
and spark plug (bank 1)

2.

Fuel injector (bank 1)

3.

Fuel injector (bank 2)

4.

Ignition coil (with power transistor) 
and spark plug (bank 2)

5.

Knock sensor (bank 2)

6.

Knock sensor (bank 1)

: Vehicle front

1.

Crankshaft position sensor (POS)

2.

Camshaft position sensor (PHASE) 
(bank 1)

3.

Camshaft position sensor (PHASE) 
(bank 2)

: Vehicle front

JMBIA1109ZZ

JMBIA1110ZZ

JMBIA1114ZZ

Revision: 2008 October

2009 Murano

MULTIPORT FUEL INJECTION SYSTEM

EC-33

< FUNCTION DIAGNOSIS >

[VQ35DE]

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1.

Cooling fan motor-1

2.

Cooling fan motor-1 harness con-
nector

3.

Cooling fan motor-1 harness con-
nector

4.

Cooling fan motor-2

5.

Engine coolant temperature sensor

: Vehicle front

1.

Refrigerant pressure sensor

2.

Battery current sensor

: Vehicle front

1.

ECM

2.

IPDM E/R

3.

Fuel pump fuse

: Vehicle front

JMBIA1112ZZ

JMBIA1113ZZ

JMBIA1115ZZ

Revision: 2008 October

2009 Murano

EC-34

< FUNCTION DIAGNOSIS >

[VQ35DE]

MULTIPORT FUEL INJECTION SYSTEM

JMBIA1832GB

1.

A/F sensor 1 (bank 1) harness con-
nector

2.

A/F sensor 1 (bank 1)

3.

A/F sensor 1 (bank 2) harness con-
nector

4.

A/F sensor 1 (bank 2)

: Vehicle front

1.

HO2S2 (bank 1)

2.

HO2S2 (bank 2)

3.

HO2S2 (bank 2) harness connector

4.

HO2S2 (bank 1) harness connector

5.

Power steering pressure sensor

6.

Drive shaft (RH)

: Vehicle front

JMBIA1116ZZ

JMBIA1117ZZ

Revision: 2008 October

2009 Murano

MULTIPORT FUEL INJECTION SYSTEM

EC-35

< FUNCTION DIAGNOSIS >

[VQ35DE]

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1.

Electronic controlled engine mount 
control solenoid valve

2.

VIAS control solenoid valve 1

3.

VIAS control solenoid valve 2

4.

EVAP canister purge volume control 
solenoid valve

5.

EVAP service port

6.

EVAP control system pressure sen-
sor

7.

EVAP canister vent control valve

8.

EVAP canister

: Vehicle front

1.

Intake valve timing control solenoid 
valve (bank 1)

2.

Intake valve timing control solenoid 
valve (bank 2)

3.

Data link connector

1.

Stop lamp switch

2.

ASCD brake switch

3.

Accelerator pedal position sensor

JMBIA1111ZZ

JMBIA1118ZZ

JMBIA1119ZZ

JMBIA1120ZZ

Revision: 2008 October

2009 Murano

EC-36

< FUNCTION DIAGNOSIS >

[VQ35DE]

MULTIPORT FUEL INJECTION SYSTEM

Component Description

INFOID:0000000003387892

1.

ASCD steering switch

2.

CANSEL switch

3.

RESUME/ACCELERATE switch

4.

SET/COAST switch

5.

MAIN switch

1.

Fuel level sensor unit and fuel pump 
harness connector

2.

Fuel level sensor unit and fuel pump 3.

Fuel pressure regulator

: Vehicle front

JMBIA1121ZZ

Component

Reference

A/F sensor 1

EC-186, "Description"

Accelerator pedal position sensor

EC-413, "Description"

Camshaft position sensor (PHASE)

EC-264, "Description"

Crankshaft position sensor (POS)

EC-260, "Description"

Engine coolant temperature sensor

EC-170, "Description"

Fuel injector

EC-444, "Description"

Heated oxygen sensor 2

EC-203, "Description"

Intake air temperature sensor

EC-167, "Description"

Knock sensor

EC-257, "Description"

Mass air flow sensor

EC-154, "Description"

Power steering pressure sensor

EC-339, "Description"

TCM

EC-350, "Description"

Throttle position sensor

EC-175, "Description"

Revision: 2008 October

2009 Murano

ELECTRIC IGNITION SYSTEM

EC-37

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ELECTRIC IGNITION SYSTEM

System Diagram

INFOID:0000000003387893

System Description

INFOID:0000000003387894

INPUT/OUTPUT SIGNAL CHART

*1: This signal is sent to the ECM via the CAN communication line.

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

SYSTEM DESCRIPTION

Ignition order: 1 - 2 - 3 - 4 - 5 - 6
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the
engine. The ignition timing data is stored in the ECM.
The ECM receives information such as the injection pulse width and camshaft position sensor (PHASE) sig-
nal. Computing this information, ignition signals are transmitted to the power transistor.
During the following conditions, the ignition timing is revised by the ECM according to the other data stored in
the ECM.
• At starting
• During warm-up
• At  idle
• At low battery voltage
• During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not

JMBIA1834GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed*

2

Piston position

Ignition timing 
control

Ignition coil
(with power transistor)

Camshaft position sensor (PHASE)

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

TCM

Gear position

Battery

Battery voltage*

2

Knock sensor

Engine knocking

Combination meter

Vehicle speed*

1

Revision: 2008 October

2009 Murano

EC-38

< FUNCTION DIAGNOSIS >

[VQ35DE]

ELECTRIC IGNITION SYSTEM

operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.
The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.

Component Parts Location

INFOID:0000000003573784

1.

Intake valve timing control solenoid 
valve (bank 1)

2.

Intake valve timing control solenoid 
valve (bank 2)

3.

Electronic controlled engine mount 
control solenoid valve

4.

Fuel injector (bank 2)

5.

A/F sensor 1 (bank 2)

6.

Cooling fan motor-2

7.

Ignition coil (with power transistor) 
and spark plug (bank 2)

8.

Camshaft position sensor (PHASE) 
(bank 2)

9.

Crankshaft position sensor (POS)

10. Engine coolant temperature sensor

11.

Cooling fan motor-1

12. ECM

13. Refrigerant pressure sensor

14. Battery current sensor

15. IPDM E/R

16. Mass air flow sensor (with intake air 

temperature sensor)

17. Electric throttle control actuator

18. EVAP service port

19. Power valve actuator 2

20. EVAP canister purge volume control 

solenoid valve

21. Camshaft position sensor (PHASE) 

(bank 1)

22. Ignition coil (with power transistor) 

and spark plug (bank 1)

23. A/F sensor 1 (bank 1)

24. Fuel injector (bank 1)

25. VIAS control solenoid valve 1 and 2

26. Power valve actuator 1

JMBIA1108ZZ

Revision: 2008 October

2009 Murano

ELECTRIC IGNITION SYSTEM

EC-39

< FUNCTION DIAGNOSIS >

[VQ35DE]

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EC

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1.

Mas air flow sensor (with intake air 
temperature sensor)

2.

Electric throttle control actuator

: Vehicle front

1.

Ignition coil (with power transistor) 
and spark plug (bank 1)

2.

Fuel injector (bank 1)

3.

Fuel injector (bank 2)

4.

Ignition coil (with power transistor) 
and spark plug (bank 2)

5.

Knock sensor (bank 2)

6.

Knock sensor (bank 1)

: Vehicle front

1.

Crankshaft position sensor (POS)

2.

Camshaft position sensor (PHASE) 
(bank 1)

3.

Camshaft position sensor (PHASE) 
(bank 2)

: Vehicle front

JMBIA1109ZZ

JMBIA1110ZZ

JMBIA1114ZZ

Revision: 2008 October

2009 Murano

 

 

 

 

 

 

 

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