Nissan Murano Z51 (2008 year). Manual - part 150

GI-40, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000003624898

INSPECTION START

Will CONSULT-III be used?
Will CONSULT-III be used?

YES

>> GO TO 2.

>> GO TO 3.

CHECK HEATED OXYGEN SENSOR 2

With CONSULT-III

Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.

Start engine and warm it up to the normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

Let engine idle for 1 minute.

Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)/(B2)” as the monitor item
with CONSULT-III.

Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to

25%.

“HO2S2 (B1)/(B2)” should be above 0.68 V at least once when the “FUEL INJECTION” is + 25%.
“HO2S2 (B1)/(B2)” should be below 0.18 V at least once when the “FUEL INJECTION” is

−

25%.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 6.

CHECK HEATED OXYGEN SENSOR 2-I

Without CONSULT-III

Start engine and warm it up to the normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

Let engine idle for 1 minute.

Check the voltage between ECM harness connector terminals under the following conditions.

PBIB3458E

Revision: 2008 October

2009 Murano

P0138, P0158 HO2S2

EC-217

< COMPONENT DIAGNOSIS >

[VQ35DE]

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 4.

CHECK HEATED OXYGEN SENSOR 2-II

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 5.

CHECK HEATED OXYGEN SENSOR 2-III

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 6.

REPLACE HEATED OXYGEN SENSOR 2

Replace malfunctioning heated oxygen sensor 2.

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

ECM

Condition

Voltage

Connector

–

Terminal

[HO2S2 (bank 1)

signal]

(Sensor
ground)

Revving up to 4,000 rpm under no load at
least 10 times

The voltage should be above 0.68 V at
least once during this procedure.
The voltage should be below 0.18 V at
least once during this procedure.

[HO2S2 (bank 2)

signal]

ECM

Condition

Voltage

Connector

–

Terminal

[HO2S2 (bank 1)

signal]

(Sensor
ground)

Keeping engine at idle for 10 minutes

The voltage should be above 0.68 V at
least once during this procedure.
The voltage should be below 0.18 V at
least once during this procedure.

[HO2S2 (bank 2)

signal]

ECM

Condition

Voltage

Connector

–

Terminal

[HO2S2 (bank 1)

signal]

(Sensor
ground)

Coasting from 80 km/h (50 MPH) with se-
lector lever in the D position

The voltage should be above 0.68 V at
least once during this procedure.
The voltage should be below 0.18 V at
least once during this procedure.

[HO2S2 (bank 2)

signal]

Revision: 2008 October

2009 Murano

P0139, P0159 HO2S2

EC-219

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0139, P0159 HO2S2

Description

INFOID:0000000003591596

The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the air fuel ratio (A/F) sensor 1
are shifted, the air-fuel ratio is controlled to stoichiometric, by the sig-
nal from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1 V in richer conditions to 0 V in leaner con-
ditions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.

DTC Logic

INFOID:0000000003388011

DTC DETECTION LOGIC

The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the air fuel ratio (A/F) sensor 1. The oxy-
gen storage capacity of the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the switching response of the sen-
sor's voltage is faster than specified during various driving conditions
such as fuel-cut.

DTC CONFIRMATION PROCEDURE

INSPECTION START

Will CONSULT-III be used?

YES

>> GO TO 2.

>> GO TO 5.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30

C (32 to 86

F).

>> GO TO 3.

SEF327R

SEF302U

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0139

Heated oxygen sensor 2
(bank 1) circuit slow re-
sponse

It takes more time for the sensor to respond be-
tween rich and lean than the specified time.

• Harness or connectors

(The sensor circuit is open or shorted)

• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector
• Intake air leakage

P0159

Heated oxygen sensor 2
(bank 2) circuit slow re-
sponse

Revision: 2008 October

2009 Murano

EC-220

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0139, P0159 HO2S2

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT-III

Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.

Start engine and warm it up to the normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

Let engine idle for 1 minute.

Open engine hood.

Select “HO2S2 (B1) P0139” or “HO2S2 (B2) P0159” of “HO2S2” in “DTC WORK SUPPORT” mode with
CONSULT-III.

10. Follow the instruction of CONSULT-III display.

NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.

11. Touch “SELF-DIAG RESULTS”.

Which is displayed on CONSULT-III screen?

>> INSPECTION END

>> Go to

EC-221, "Diagnosis Procedure"

CAN NOT BE DIAGNOSED>>GO TO 4.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).

Perform DTC confirmation procedure again.

>> GO TO 3.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to

EC-220, "Component Function Check"

NOTE:
Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

EC-221, "Diagnosis Procedure"

Component Function Check

INFOID:0000000003388012

PERFORM COMPONENT FUNCTION CHECK-I

Without CONSULT-III

Start engine and warm it up to the normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

Let engine idle for 1 minute.

Check the voltage between ECM harness connector terminals under the following conditions.

Revision: 2008 October

2009 Murano

P0139, P0159 HO2S2

EC-221

< COMPONENT DIAGNOSIS >

[VQ35DE]

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 2.

PERFORM COMPONENT FUNCTION CHECK-II

Check the voltage between ECM harness connector terminals under the following conditions.
.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 3.

PERFORM COMPONENT FUNCTION CHECK-III

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

EC-221, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000003388013

CHECK GROUND CONNECTION

Turn ignition switch OFF.

Check ground connection E38. Refer to Ground Inspection in

GI-43, "Circuit Inspection"

Is the inspection result normal?

YES

>> GO TO 2.

DTC

ECM

Condition

Voltage

Connec-

tor

–

Terminal

P0139

[HO2S2 (bank 1)

signal]

(Sensor
ground)

Revving up to 4,000 rpm under no
load at least 10 times

A change of voltage should be more
than 0.24 V for 1 second during this
procedure.

P0159

[HO2S2 (bank 2)

signal]

DTC

ECM

Condition

Voltage

Connec-

tor

–

Terminal

P0139

[HO2S2 (bank 1)

signal]

(Sensor
ground)

Keeping engine at idle for 10 minutes

A change of voltage should be more
than 0.24 V for 1 second during this
procedure.

P0159

[HO2S2 (bank 2)

signal]

DTC

ECM

Condition

Voltage

Connec-

tor

–

Terminal

P0139

[HO2S2 (bank 1)

signal]

(Sensor
ground)

Coasting from 80 km/h (50 MPH) in
D position

A change of voltage should be more
than 0.24 V for 1 second during this
procedure.

P0159

[HO2S2 (bank 2)

signal]

Revision: 2008 October

2009 Murano

EC-222

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0139, P0159 HO2S2

>> Repair or replace ground connection.

CLEAR MIXTURE RATIO SELF-LEARNING VALUE

Clear the mixture ratio self-learning value. Refer to

Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?

YES

>> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to

EC-226, "DTC Logic"

EC-231, "DTC Logic"

>> GO TO 3.

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect heated oxygen sensor 2 harness connector.

Disconnect ECM harness connector.

Check the continuity between heated oxygen sensor 2 (HO2S2) harness connector and ECM harness
connector.

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

Is the inspection result normal?

YES

>> GO TO 4.

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

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check the continuity between HO2S2 harness connector and ECM harness connector.

Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 5.

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

CHECK HEATED OXYGEN SENSOR 2

DTC

HO2S2

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0139

F70

Existed

P0159

F71

DTC

HO2S2

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0139

F70

Existed

P0159

F71

DTC

HO2S2

Ground

Continuity

Bank

Connector

Terminal

P0139

F70

Ground

Not existed

P0159

F71

DTC

ECM

Ground

Continuity

Connector

Terminal

P0139

Ground

Not existed

P0159

Revision: 2008 October

2009 Murano

P0139, P0159 HO2S2

EC-223

< COMPONENT DIAGNOSIS >

[VQ35DE]

EC-223, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 7.

>> GO TO 6.

REPLACE HEATED OXYGEN SENSOR 2

Replace malfunctioning heated oxygen sensor 2.

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).

>> INSPECTION END

CHECK INTERMITTENT INCIDENT

GI-40, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000003625196

INSPECTION START

Will CONSULT-III be used?

YES

>> GO TO 2.

>> GO TO 3.

CHECK HEATED OXYGEN SENSOR 2

With CONSULT-III

Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.

Start engine and warm it up to the normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

Let engine idle for 1 minute.

Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)/(B2)” as the monitor item
with CONSULT-III.

Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to

25%.

“HO2S2 (B1)/(B2)” should be above 0.68 V at least once when the “FUEL INJECTION” is + 25%.
“HO2S2 (B1)/(B2)” should be below 0.18 V at least once when the “FUEL INJECTION” is

−

25%.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 6.

CHECK HEATED OXYGEN SENSOR 2-I

Without CONSULT-III

Start engine and warm it up to the normal operating temperature.

PBIB3458E

Revision: 2008 October

2009 Murano

EC-224

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0139, P0159 HO2S2

Turn ignition switch OFF and wait at least 10 seconds.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

Let engine idle for 1 minute.

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 4.

CHECK HEATED OXYGEN SENSOR 2-II

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 5.

CHECK HEATED OXYGEN SENSOR 2-III

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 6.

REPLACE HEATED OXYGEN SENSOR 2

Replace malfunctioning heated oxygen sensor 2.

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

ECM

Condition

Voltage

Connector

–

Terminal

[HO2S2 (bank 1)

signal]

(Sensor
ground)

Revving up to 4,000 rpm under no load at
least 10 times

The voltage should be above 0.68 V at
least once during this procedure.
The voltage should be below 0.18 V at
least once during this procedure.

[HO2S2 (bank 2)

signal]

ECM

Condition

Voltage

Connector

–

Terminal

[HO2S2 (bank 1)

signal]

(Sensor
ground)

Keeping engine at idle for 10 minutes

The voltage should be above 0.68 V at
least once during this procedure.
The voltage should be below 0.18 V at
least once during this procedure.

[HO2S2 (bank 2)

signal]

ECM

Condition

Voltage

Connector

–

Terminal

[HO2S2 (bank 1)

signal]

(Sensor
ground)

Coasting from 80 km/h (50 MPH) with se-
lector lever in the D position

The voltage should be above 0.68 V at
least once during this procedure.
The voltage should be below 0.18 V at
least once during this procedure.

[HO2S2 (bank 2)

signal]

Revision: 2008 October

2009 Murano

EC-226

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0171, P0174 FUEL INJECTION SYSTEM FUNCTION

P0171, P0174 FUEL INJECTION SYSTEM FUNCTION

DTC Logic

INFOID:0000000003388015

DTC DETECTION LOGIC

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from A/F sensor 1. The ECM calculates
the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (the actual mixture ratio is too lean), the
ECM judges the condition as the fuel injection system malfunction and illuminates the MIL (2 trip detection
logic).

DTC CONFIRMATION PROCEDURE

NOTE:
Check vehicle specifications and VIN, then select the procedure to be performed. (Refer to the table below.)

TYPE A

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE-I

Clear the mixture ratio self-learning value. Refer to

Start engine.

Is it difficult to start engine?

Sensor

Input signal to ECM

ECM function

Actuator

A/F sensor 1

Density of oxygen in exhaust gas
(Mixture ratio feedback signal)

Fuel injection control

Fuel injector

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0171

Fuel injection system too
lean (bank 1)

• Fuel injection system does not operate properly.
• The amount of mixture ratio compensation is too

large. (The mixture ratio is too lean.)

• Intake air leakage
• A/F sensor 1
• Fuel injector
• Exhaust gas leakage
• Incorrect fuel pressure
• Lack of fuel
• Mass air flow sensor
• Incorrect PCV hose connection

P0174

Fuel injection system too
lean (bank 2)

Vehicle specification

Vehicle serial number

TYPE

2WD

Up to JN8AZ18U*9W100000

From JN8AZ18U*9W100001

Up to JN8AZ18U*9W710000

From JN8AZ18U*9W710001

4WD

Up to JN8AZ18W*9W200000

From JN8AZ18W*9W200001

Up to JN8AZ18W*9W810000

From JN8AZ18W*9W810001

Revision: 2008 October

2009 Murano

P0171, P0174 FUEL INJECTION SYSTEM FUNCTION

EC-227

< COMPONENT DIAGNOSIS >

[VQ35DE]

YES

>> GO TO 3.

>> GO TO 4.

RESTART ENGINE

If it is difficult to start engine, the fuel injection system has a malfunction, too.
Crank engine while depressing accelerator pedal.
NOTE:
• When depressing accelerator pedal three-fourths (3/4) or more, the control system does not start the

engine. Do not depress accelerator pedal too much.

Does engine start?

YES

>> Go to

>> Check exhaust and intake air leakage visually.

PERFORM DTC CONFIRMATION PROCEDURE-II

Keep engine idle for at least 10 minutes.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to

>> GO TO 5.

PERFORM DTC CONFIRMATION PROCEDURE-III

Turn ignition switch OFF and wait at least 10 seconds.

Start engine and drive the vehicle under similar conditions to (1st trip) Freeze Frame Data for 10 minutes.
Refer to the table below.
Hold the accelerator pedal as steady as possible.
Similar conditions to (1st trip) Freeze Frame Data mean that the following conditions should be satisfied at
the same time.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to

>> INSPECTION END

TYPE B

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE-I

Clear the mixture ratio self-learning value. Refer to

Start engine.

Is it difficult to start engine?

YES

>> GO TO 3.

Engine speed

Engine speed in the freeze frame data

400 rpm

Vehicle speed

Vehicle speed in the freeze frame data

10 km/h (6 MPH)

Basic fuel schedule

Basic fuel schedule in freeze frame data

0.1)

Engine coolant temperature (T) condition

When the freeze frame data shows lower than 70

C (158

F),

T should be lower than 70

C (158

F).

When the freeze frame data shows higher than or equal to 70

C (158

F),

T should be higher than or equal to 70

C (158

F).

Revision: 2008 October

2009 Murano

EC-228

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0171, P0174 FUEL INJECTION SYSTEM FUNCTION

>> GO TO 4.

RESTART ENGINE

engine. Do not depress accelerator pedal too much.

Does engine start?

YES

>> Go to

>> Check exhaust and intake air leakage visually.

PERFORM DTC CONFIRMATION PROCEDURE-II

Keep engine idle for at least 5 minutes.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to

>> GO TO 5.

PERFORM DTC CONFIRMATION PROCEDURE-III

Turn ignition switch OFF and wait at least 10 seconds.

Start engine.

Maintain the following conditions for at least 10 consecutive minutes.
Hold the accelerator pedal as steady as possible.

CAUTION:

Always drive vehicle at a safe speed.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to

EC-551, "Mass Air Flow Sensor"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003388016

CHECK EXHAUST GAS LEAKAGE

Start engine and run it at idle.

Listen for an exhaust gas leakage before three way catalyst (manifold).

Is exhaust gas leakage detected?

YES

>> Repair or replace malfunctioning part.

>> GO TO 2.

CHECK FOR INTAKE AIR LEAKAGE

Listen for an intake air leakage after the mass air flow sensor.

Check PCV hose connection.

Is intake air leakage detected?

YES

>> Repair or replace malfunctioning part.

>> GO TO 3.

VHCL SPEED SE

50 - 120 km/h (31 - 75 mph)

PBIB1216E

Revision: 2008 October

2009 Murano

P0171, P0174 FUEL INJECTION SYSTEM FUNCTION

EC-229

< COMPONENT DIAGNOSIS >

[VQ35DE]

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

Turn ignition switch OFF.

Disconnect corresponding A/F sensor 1 harness connector.

Disconnect ECM harness connector.

Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 4.

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

CHECK FUEL PRESSURE

Release fuel pressure to zero. Refer to

EC-545, "Inspection"

Install fuel pressure gauge kit [SST (J-44321)] and check fuel pressure. Refer to

EC-545, "Inspection"

Is the inspection result normal?

YES

>> GO TO 6.

>> GO TO 5.

DETECT MALFUNCTIONING PART

Check fuel hoses and fuel tubes for clogging.

Is the inspection result normal?

YES

>> Replace “fuel filter and fuel pump assembly”.

>> Repair or replace malfunctioning part.

CHECK MASS AIR FLOW SENSOR

With CONSULT-III

DTC

A/F sensor 1

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0171

F27

Existed

P0174

F64

DTC

A/F sensor 1

Ground

Continuity

Bank

Connector

Terminal

P0171

F27

Ground

Not existed

P0174

F64

DTC

ECM

Ground

Continuity

Connector

Terminal

P0171

Ground

Not existed

P0174

At idling: Approximately 350 kPa (3.57 kg/cm

, 51 psi)

Revision: 2008 October

2009 Murano

EC-230

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0171, P0174 FUEL INJECTION SYSTEM FUNCTION

Install all removed parts.

Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-III.
For specification, refer to

With GST

Install all removed parts.

Check mass air flow sensor signal in Service $01 with GST.
For specification, refer to

EC-551, "Mass Air Flow Sensor"

Is the measurement value within the specification?

YES

>> GO TO 7.

>> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or

ground. Refer to

EC-163, "Diagnosis Procedure"

CHECK FUNCTION OF FUEL INJECTOR

With CONSULT-III

Start engine.

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

Check that each circuit produces a momentary engine speed drop.

With GST

Let engine idle.

Listen to each fuel injector operating sound.

Is the inspection result normal?

YES

>> GO TO 8.

>> Perform trouble diagnosis for FUEL INJECTOR, refer to

EC-444, "Diagnosis Procedure"

CHECK FUEL INJECTOR

Turn ignition switch OFF.

Confirm that the engine is cooled down and there are no fire hazards near the vehicle.

Disconnect all fuel injector harness connectors.

Remove fuel tube assembly. Refer to

EM-45, "Removal and Installation"

Keep fuel hose and all fuel injectors connected to fuel tube.

For DTC P0171, reconnect fuel injector harness connectors on bank 1.
For DTC P0174, reconnect fuel injector harness connectors on bank 2.

Disconnect all ignition coil harness connectors.

Prepare pans or saucers under each fuel injector.

Crank engine for about 3 seconds.
For DTC P0171, check that fuel sprays out from fuel injectors on bank 1.
For DTC P0174, check that fuel sprays out from fuel injectors on bank 2.

Is the inspection result normal?

YES

>> GO TO 9.

>> Replace fuel injectors from which fuel does not spray out. Always replace O-ring with new ones.

CHECK INTERMITTENT INCIDENT

GI-40, "Intermittent Incident"

>> INSPECTION END

PBIB3332E

Fuel should be sprayed evenly for each fuel injector.

Revision: 2008 October

2009 Murano

P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

EC-231

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

DTC Logic

INFOID:0000000003388017

DTC DETECTION LOGIC

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from A/F sensor 1. The ECM calculates
the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (the actual mixture ratio is too rich), the ECM
judges the condition as the fuel injection system malfunction and illuminates the MIL (2 trip detection logic).

DTC CONFIRMATION PROCEDURE

NOTE:
Check vehicle specifications and VIN, then select the procedure to be performed. (Refer to the table below.)

TYPE A

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE-I

Clear the mixture ratio self-learning value. Refer to