Nissan Murano Z50 (2006 year). Manual - part 84

TROUBLE DIAGNOSIS

EC-123

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REAL TIME DIAGNOSIS IN DATA MONITOR MODE (RECORDING VEHICLE DATA)
Description

CONSULT-II has two kinds of triggers and they can be selected by touching “SETTING” in “DATA MONITOR”
mode.

1.

“AUTO TRIG” (Automatic trigger):

●

The malfunction will be identified on the CONSULT-II screen
in real time.
In other words, DTC/1st trip DTC and malfunction item will be
displayed if the malfunction is detected by ECM.
At the moment a malfunction is detected by ECM, “MONI-
TOR” in “DATA MONITOR” screen is changed to “Recording
Data ... xx%” as shown at right, and the data after the mal-
function detection is recorded. Then when the percentage
reached 100%, “REAL-TIME DIAG” screen is displayed. If
“STOP” is touched on the screen during “Recording Data ...
xx%”, “REAL-TIME DIAG” screen is also displayed.
The recording time after the malfunction detection and the
recording speed can be changed by “TRIGGER POINT” and
“Recording Speed”. Refer to CONSULT-II OPERATION MAN-
UAL.

2.

“MANU TRIG” (Manual trigger):

●

DTC/1st trip DTC and malfunction item will not be displayed
automatically on CONSULT-II screen even though a malfunc-
tion is detected by ECM.
DATA MONITOR can be performed continuously even though
a malfunction is detected.

SEF705Y

SEF707X

EC-124

TROUBLE DIAGNOSIS

Revision: 2006 August

2006 Murano

Operation

1.

“AUTO TRIG”

●

While trying to detect the DTC/1st trip DTC by performing the DTC Confirmation Procedure, be sure to
select to “DATA MONITOR (AUTO TRIG)” mode. You can confirm the malfunction at the moment it is
detected.

●

While narrowing down the possible causes, CONSULT-II should be set in “DATA MONITOR (AUTO
TRIG)” mode, especially in case the incident is intermittent.
When you are inspecting the circuit by gently shaking (or twisting) the suspicious connectors, compo-
nents and harness in the DTC Confirmation Procedure, the moment a malfunction is found the DTC/1st
trip DTC will be displayed. (Refer to INCIDENT SIMULATION TESTS in 

GI-27, "How to Perform Effi-

cient Diagnosis for an Electrical Incident"

 .)

2.

“MANU TRIG”

●

If the malfunction is displayed as soon as “DATA MONITOR” is selected, reset CONSULT-II to “MANU
TRIG”. By selecting “MANU TRIG” you can monitor and store the data. The data can be utilized for fur-
ther diagnosis, such as a comparison with the value for the normal operating condition.

Generic Scan Tool (GST) Function

NBS002ZO

DESCRIPTION

Generic Scan Tool (OBDII scan tool) complying with SAE J1978 has
8 different functions explained below.
ISO9141 is used as the protocol.
The name GST or Generic Scan Tool is used in this service manual.

PBIB0197E

SEF139P

TROUBLE DIAGNOSIS

EC-125

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FUNCTION

INSPECTION PROCEDURE

1.

Turn ignition switch OFF.

2.

Connect GST to data link connector, which is located under LH
dash panel near the hood opener handle.

Diagnostic test mode

Function

Service $01

READINESS TESTS

This diagnostic service gains access to current emission-related data values, including 
analog inputs and outputs, digital inputs and outputs, and system status information.

Service $02

(FREEZE DATA)

This diagnostic service gains access to emission-related data value which were stored by 
ECM during the freeze frame. For details, refer to 

EC-51, "FREEZE FRAME DATA AND 

1ST TRIP FREEZE FRAME DATA"

 .

Service $03

DTCs

This diagnostic service gains access to emission-related power train trouble codes which 
were stored by ECM.

Service $04

CLEAR DIAG INFO

This diagnostic service can clear all emission-related diagnostic information. This 
includes:

●

Clear number of diagnostic trouble codes (Service $01)

●

Clear diagnostic trouble codes (Service $03)

●

Clear trouble code for freeze frame data (Service $01)

●

Clear freeze frame data (Service $02)

●

Reset status of system monitoring test (Service $01)

●

Clear on board monitoring test results (Service $06 and $07)

Service $06

(ON BOARD TESTS)

This diagnostic service accesses the results of on board diagnostic monitoring tests of 
specific components/systems that are not continuously monitored.

Service $07

(ON BOARD TESTS)

This diagnostic service enables the off board test drive to obtain test results for emission-
related powertrain components/systems that are continuously monitored during normal 
driving conditions.

Service $08

—

This diagnostic service can close EVAP system in ignition switch ON position (Engine 
stopped). When this diagnostic service is performed, the EVAP canister vent control 
valve can be closed.
In the following conditions, this diagnostic service cannot function.

●

Low ambient temperature

●

Low battery voltage

●

Engine running

●

Ignition switch OFF

●

Low fuel temperature

●

Too much pressure is applied to EVAP system

Service $09

(CALIBRATION ID)

This diagnostic service enables the off-board test device to request specific vehicle infor-
mation such as Vehicle Identification Number (VIN) and Calibration IDs.

PBIB1300E

EC-126

TROUBLE DIAGNOSIS

Revision: 2006 August

2006 Murano

3.

Turn ignition switch ON.

4.

Enter the program according to instruction on the screen or in
the operation manual.
(*: Regarding GST screens in this section, sample screens are
shown.)

5.

Perform each diagnostic mode according to each service proce-
dure.
For further information, see the GST Operation Manual of
the tool maker.

SEF398S

SEF416S

TROUBLE DIAGNOSIS

EC-127

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CONSULT-II Reference Value in Data Monitor

NBS002ZP

Remarks:

●

 Specification data are reference values.

●

 Specification data are output/input values which are detected or supplied by the ECM at the connector.

* Specification data may not be directly related to their components signals/values/operations.
i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show the specification data in

spite of the ignition timing not being adjusted to the specification data. This IGN TIMING monitors the data calculated by the ECM
according to the signals input from the camshaft position sensor and other ignition timing related sensors.

MONITOR ITEM

CONDITION

SPECIFICATION

ENG SPEED

●

Run engine and compare CONSULT-II value with the tachometer indica-
tion.

Almost the same speed as the 
tachometer indication.

MAS A/F SE-B1

●

See 

EC-132, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"

 .

B/FUEL SCHDL

●

See 

EC-132, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"

 .

A/F ALPHA-B1
A/F ALPHA-B2

●

See 

EC-132, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"

 .

COOLAN TEMP/S

●

Engine: After warming up

More than 70

°

C (158

°

F)

A/F SEN1 (B1)
A/F SEN1 (B2)

●

Engine: After warming up

Maintaining engine speed at 2,000 
rpm

Fluctuates around 1.5 V

HO2S2 (B1)
HO2S2 (B2)

●

Revving engine from idle to 3,000 rpm quickly after the following condi-
tions are met

–

Engine: After warming up

–

Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and 
at idle for 1 minute under no load

0 - 0.3V 

←→

 Approx. 0.6 - 

1.0V

HO2S2 MNTR (B1)
HO2S2 MNTR (B2)

LEAN 

←→

 RICH

VHCL SPEED SE

●

Turn drive wheels and compare CONSULT-II value with the speedometer 
indication.

Almost the same speed as the 
speedometer indication

BATTERY VOLT

●

Ignition switch: ON (Engine stopped)

11 - 14V

ACCEL SEN 1
ACCEL SEN 2*

●

Ignition switch: ON
(Engine stopped)

Accelerator pedal: Fully released

0.5 - 1.0V

Accelerator pedal: Fully depressed

4.2 - 4.8V

THRTL SEN 1
THRTL SEN 2*

●

Ignition switch: ON
(Engine stopped)

●

Shift lever: D

Accelerator pedal: Fully released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

EVAP SYS PRES

●

Ignition switch: ON

Approx. 1.8 - 4.8V

START SIGNAL

●

Ignition switch: ON 

→

 START 

→

 ON

OFF 

→

 ON 

→

 OFF

CLSD THL POS

●

Ignition switch: ON
(Engine stopped)

Accelerator pedal: Fully released

ON

Accelerator pedal: Slightly depressed

OFF

AIR COND SIG

●

Engine: After warming up, idle 
the engine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor operates.)

ON

P/N POSI SW

●

Ignition switch: ON

Shift lever: P or N

ON

Shift lever: Except above

OFF

PW/ST SIGNAL

●

Engine: After warming up, idle 
the engine

Steering wheel: Not being turned

OFF

Steering wheel: Being turned

ON

LOAD SIGNAL

●

Ignition switch: ON

Rear window defogger switch is ON 
and/or lighting switch is in 2nd.

ON

Rear window defogger switch is OFF 
and lighting switch is OFF.

OFF

IGNITION SW

●

Ignition switch: ON 

→

 OFF 

→

 ON

ON 

→

 OFF 

→

 ON

HEATER FAN SW

●

Engine: After warming up, idle 
the engine

Heater fan: Operating

ON

Heater fan: Not operating

OFF

BRAKE SW

●

Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

EC-128

TROUBLE DIAGNOSIS

Revision: 2006 August

2006 Murano

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

IGN TIMING

●

Engine: After warming up

●

Shift lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

13

°

 - 18

°

 BTDC

2,000 rpm

25

°

 - 45

°

 BTDC

CAL/LD VALUE

●

Engine: After warming up

●

Shift lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

5% - 35%

2,500 rpm

5% - 35%

MASS AIRFLOW

●

Engine: After warming up

●

Shift lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

2.0 - 6.0 g·m/s

2,500 rpm

7.0 - 20.0 g·m/s

PURG VOL C/V

●

Engine: After warming up

●

Shift lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle
(Accelerator pedal is not depressed 
even slightly, after engine starting)

0%

2,000 rpm

—

INT/V TIM (B1)
INT/V TIM (B2)

●

Engine: After warming up

●

Shift lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

−

5

°

 - 5

°

CA

2,000 rpm

Approx. 0

°

 - 30

°

CA

INT/V SOL (B1)
INT/V SOL (B2)

●

Engine: After warming up

●

Shift lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

0% - 2%

2,000 rpm

Approx. 0% - 50%

VIAS S/V

●

Engine: After warming up

1,800 - 3,600 rpm

ON

Except above conditions

OFF

AIR COND RLY

●

Engine: After warming up, idle 
the engine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor operates)

ON

ENGINE MOUNT

●

Engine: After warming up

Below 950 rpm

IDLE

Above 950 rpm

TRVL

FUEL PUMP RLY

●

For 1 second after turning ignition switch ON

●

Engine running or cranking

ON

●

Except above conditions

OFF

VENT CONT/V

●

Ignition switch: ON

OFF

THRTL RELAY

●

Ignition switch: ON

ON

COOLING FAN

●

Engine: After warming up, idle 
the engine

●

Air conditioner switch: OFF

Engine coolant temperature is 97

°

C 

(206

°

F) or less

OFF

Engine coolant temperature is 
between 95

°

C (203

°

F) and 98

°

C 

(208

°

F)

LOW

Engine coolant temperature is 100

°

C 

(212

°

F) or more

HI

MONITOR ITEM

CONDITION

SPECIFICATION

TROUBLE DIAGNOSIS

EC-129

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*: Accelerator pedal position sensor 2 signal and throttle position sensor 2 signal are converted by ECM internally. Thus, they differ from
ECM terminals voltage signal.

HO2S2 HTR (B1)
HO2S2 HTR (B2)

●

Engine speed: Below 3,600 rpm after the following conditions are met.

–

Engine: After warming up

–

Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and 
at idle for 1 minute under no load

ON

●

Engine speed: Above 3,600 rpm

OFF

I/P PULLY SPD

●

Vehicle speed: More than 20 km/h (12 MPH)

Almost the same speed as the 
tachometer indication

VEHICLE SPEED

●

Turn drive wheels and compare CONSULT-II value with the speedometer 
indication.

Almost the same speed as the 
speedometer indication

TRVL AFTER MIL

●

Ignition switch: ON

Vehicle has traveled after MIL has 
turned ON.

0 - 65,535 km
(0 - 40,723 mile)

A/F S1 HTR (B1)
A/F S1 HTR (B2)

●

Engine: After warming up, idle the engine

0 - 100%

AC PRESS SEN

●

Engine: Idle

●

Both A/C switch and blower fan switch: ON (Compressor operates)

1.0 - 4.0V

VHCL SPEED SE

●

Turn drive wheels and compare CONSULT-II value with the speedometer 
indication.

Almost the same speed as the 
speedometer indication

SET VHCL SPD

●

Engine: Running

ASCD: Operating.

The preset vehicle speed is 
displayed.

MAIN SW

●

Ignition switch: ON

MAIN switch: Pressed

ON

MAIN switch: Released

OFF

CANCEL SW

●

Ignition switch: ON

CANCEL switch: Pressed

ON

CANCEL switch: Released

OFF

RESUME/ACC SW

●

Ignition switch: ON

RESUME/ACCELERATE switch: 
Pressed

ON

RESUME/ACCELERATE switch: 
Released

OFF

SET SW

●

Ignition switch: ON

SET/COAST switch: Pressed

ON

SET/COAST switch: Released

OFF

BRAKE SW1

●

Ignition switch: ON

Brake pedal: Fully released

ON

Brake pedal: Slightly depressed

OFF

BRAKE SW2

●

Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

CRUISE LAMP

●

Ignition switch: ON

MAIN switch: Pressed at the 1st time 

→

 at the 2nd time

ON 

→

 OFF

SET LAMP

●

MAIN switch: ON

●

When vehicle speed is between 
40 km/h (25 MPH) and 144 km/h 
(89 MPH)

ASCD: Operating

ON

ASCD: Not operating

OFF

MONITOR ITEM

CONDITION

SPECIFICATION

EC-130

TROUBLE DIAGNOSIS

Revision: 2006 August

2006 Murano

Major Sensor Reference Graph in Data Monitor Mode

NBS002ZQ

The following are the major sensor reference graphs in “DATA MONITOR” mode.

CLSD THL POS, ACCEL SEN 1, THRTL SEN 1

Below is the data for “CLSD THL POS”, “ACCEL SEN 1” and “THRTL SEN 1” when depressing the accelera-
tor pedal with the ignition switch ON and with shift lever in D position.
The signal of “ACCEL SEN 1” and “THRTL SEN 1” should rise gradually without any intermittent drop or rise
after “CLSD THL POS” is changed from ON to OFF.

ENG SPEED, MAS A/F SE-B1, THRTL SEN 1, HO2S2 (B1), INJ PULSE-B1

Below is the data for “ENG SPEED”, “MAS A/F SE-B1”, “THRTL SEN 1”, “HO2S2 (B1)” and “INJ PULSE-B1”
when revving engine quickly up to 4,800 rpm under no load after warming up engine sufficiently.
Each value is for reference, the exact value may vary.

PBIB0198E

PBIB2445E

TROUBLE DIAGNOSIS

EC-131

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PBIB2099E

EC-132

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Revision: 2006 August

2006 Murano

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

PFP:00031

Description

NBS002ZR

The specification (SP) value indicates the tolerance of the value that is displayed in “DATA MONITOR (SPEC)”
mode of CONSULT-II during normal operation of the Engine Control System. When the value in “DATA MONI-
TOR (SPEC)” mode is within the SP value, the Engine Control System is confirmed OK. When the value in
“DATA MONITOR (SPEC)” mode is NOT within the SP value, the Engine Control System may have one or
more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the
MIL.
The SP value will be displayed for the following three items:

●

B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board cor-
rection)

●

A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)

●

MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)

Testing Condition

NBS002ZS

●

Vehicle driven distance: More than 5,000 km (3,107 miles)

●

Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm

2

 , 14.25 - 15.12 psi)

●

Atmospheric temperature: 20 - 30

°

C (68 - 86

°

F)

●

Engine coolant temperature: 75 - 95

°

C (167 - 203

°

F)

●

Transmission: Warmed-up*

1

●

Electrical load: Not applied*

2

●

Engine speed: Idle

*1: After the engine is warmed up to normal operating temperature, drive vehicle until “FLUID TEMP SE” (CVT
fluid temperature sensor signal) indicates more than 60

°

C (140

°

F).

*2: Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight
ahead.

Inspection Procedure

NBS002ZT

NOTE:
Perform “DATA MONITOR (SPEC)” mode in maximum scale display.

1.

Perform 

EC-68, "Basic Inspection"

 .

2.

Confirm that the testing conditions indicated above are met.

3.

Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2”
and “MAS A/F SE-B1” in “DATA MONITOR (SPEC)” mode with
CONSULT-II.

4.

Make sure that monitor items are within the SP value.

5.

If NG, go to 

EC-133, "Diagnostic Procedure"

 .

SEF601Z

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-133

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Diagnostic Procedure

NBS002ZU

OVERALL SEQUENCE

PBIB2268E

EC-134

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Revision: 2006 August

2006 Murano

PBIB3214E

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-135

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DETAILED PROCEDURE

1. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Start engine.

2.

Confirm that the testing conditions are met. Refer to 

EC-132, "Testing Condition"

 .

3.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR
(SPEC)” mode, and make sure that the each indication is within
the SP value.

NOTE:
Check “A/F ALPHA-B1”, “A/F ALPHA-B2” for approximately 1
minute because they may fluctuate. It is NG if the indication is
out of the SP value even a little.

OK or NG

OK

>> GO TO 17.

NG (Less than the SP value)>>GO TO 2.
NG (More than the SP value)>>GO TO 3.

2. 

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and
make sure that the indication is within the SP value.

OK or NG

OK

>> GO TO 4.

NG (More than the SP value)>>GO TO 19.

3. 

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and
make sure that the indication is within the SP value.

OK or NG

OK

>> GO TO 6.

NG (More than the SP value)>>GO TO 6.
NG (Less than the SP value)>>GO TO 25.

4. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Stop the engine.

2.

Disconnect PCV hose, and then plug it.

3.

Start engine.

4.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 6.

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EC-136

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Revision: 2006 August

2006 Murano

5. 

CHANGE ENGINE OIL

1.

Stop the engine.

2.

Change engine oil.

NOTE:
This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving
conditions (such as when engine oil temperature does not rise enough since a journey distance is too
short during winter). The symptom will not be detected after changing engine oil or changing driving con-
dition.

>> INSPECTION END

6. 

CHECK FUEL PRESSURE

Check fuel pressure. (Refer to 

EC-78, "FUEL PRESSURE CHECK"

 .)

OK or NG

OK

>> GO TO 9.

NG (Fuel pressure is too high)>>Replace fuel pressure regulator, refer to 

EC-78

 . GO TO 8.

NG (Fuel pressure is too low)>>GO TO 7.

7. 

DETECT MALFUNCTIONING PART

1.

Check the following.

–

Clogged and bent fuel hose and fuel tube

–

Clogged fuel filter

–

Fuel pump and its circuit (Refer to 

EC-634, "FUEL PUMP"

 .)

2.

If NG, repair or replace the malfunctioning part. (Refer to 

EC-78

 .)

If OK, replace fuel pressure regulator.

>> GO TO 8.

8. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Start engine.

2.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 9.

9. 

PERFORM POWER BALANCE TEST

1.

Perform “POWER BALANCE” in “ACTIVE TEST” mode.

2.

Make sure that the each cylinder produces a momentary engine
speed drop.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 10.

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TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-137

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Revision: 2006 August

2006 Murano

10. 

DETECT MALFUNCTIONING PART

1.

Check the following.

–

Ignition coil and its circuit (Refer to 

EC-640, "IGNITION SIGNAL"

 .)

–

Fuel injector and its circuit (Refer to 

EC-627, "FUEL INJECTOR"

 .)

–

Intake air leakage

–

Low compression pressure (Refer to 

EM-96, "CHECKING COMPRESSION PRESSURE"

 .)

2.

If NG, repair or replace the malfunctioning part.
If OK, replace fuel injector. (It may be caused by leakage from fuel injector or clogging.)

>> GO TO 11.

11. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Start engine.

2.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 12.

12. 

CHECK A/F SENSOR 1 FUNCTION

Perform all DTC Confirmation Procedure related with A/F sensor 1.

●

For DTC P0130, P0150, refer to 

EC-229, "DTC Confirmation Procedure"

 .

●

For DTC P0131, P0151, refer to 

EC-240, "DTC Confirmation Procedure"

 .

●

For DTC P0132, P0152, refer to 

EC-250, "DTC Confirmation Procedure"

 .

●

For DTC P0133, P0153, refer to 

EC-261, "DTC Confirmation Procedure"

 .

●

For DTC P2A00, P2A03, refer to 

EC-598, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 13.

13. 

CHECK A/F SENSOR 1 CIRCUIT

Perform Diagnostic Procedure according to corresponding DTC.

>> GO TO 14.

14. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Start engine.

2.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 15.

15. 

DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR

1.

Stop the engine.

2.

Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it.

>> GO TO 16.

EC-138

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Revision: 2006 August

2006 Murano

16. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Start engine.

2.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.

OK or NG

OK

>> INSPECTION END

NG

>> Detect malfunctioning part according to 

EC-89, "Symptom Matrix Chart"

 .

17. 

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and
make sure that the indication is within the SP value.
OK or NG

OK

>> INSPECTION END

NG (More than the SP value)>>GO TO 18.
NG (Less than the SP value)>>GO TO 25.

18. 

DETECT MALFUNCTIONING PART

1.

Check for the cause of large engine friction. Refer to the following.

–

Engine oil level is too high

–

Engine oil viscosity

–

Belt tension of power steering, alternator, A/C compressor, etc. is excessive

–

Noise from engine

–

Noise from transmission, etc.

2.

Check for the cause of insufficient combustion. Refer to the following.

–

Valve clearance malfunction

–

Intake valve timing control function malfunction

–

Camshaft sprocket installation malfunction, etc.

>> Repair or replace malfunctioning part, and then GO TO 30.

19. 

CHECK INTAKE SYSTEM

Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.

●

Crushed air ducts

●

Malfunctioning seal of air cleaner element

●

Uneven dirt of air cleaner element

●

Improper specification of intake air system

OK or NG

OK

>> GO TO 21.

NG

>> Repair or replace malfunctioning part, and then GO TO 20.

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