Nissan Murano Z50 (2003 year). Manual

EC-80

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Revision; 2004 April

2003 Murano

●

The time required for each diagnosis varies with road surface conditions, weather, altitude, individual driv-
ing habits, etc.
Zone A refers to the range where the time, required for the diagnosis under normal conditions*, is the
shortest.
Zone B refers to the range where the diagnosis can still be performed if the diagnosis is not completed
within zone A.

*: Normal conditions refer to the following:

●

Sea level

●

Flat road

●

Ambient air temperature: 20 - 30

C (68 - 86

●

Diagnosis is performed as quickly as possible under normal conditions.
Under different conditions [For example: ambient air temperature other than 20 - 30

C (68 - 86

F)], diag-

nosis may also be performed.

Pattern 1:

●

The engine is started at the engine coolant temperature of

−

10 to 35

C (14 to 95

(where the voltage between the ECM terminal 73 and ground is 3.0 - 4.3V).

●

The engine must be operated at idle speed until the engine coolant temperature is greater than
70

C (158

F) (where the voltage between the ECM terminal 73 and ground is lower than 1.4V).

●

The engine is started at the fuel tank temperature of warmer than 0

C (32

F) (where the voltage

between the ECM terminal 107 and ground is less than 4.1V).

Pattern 2:

●

When steady-state driving is performed again even after it is interrupted, each diagnosis can be con-
ducted. In this case, the time required for diagnosis may be extended.

Pattern 3:

●

The driving pattern outlined in *2 must be repeated at least 3 times.

Pattern 4:

●

Tests are performed after the engine has been operated for at least 17 minutes.

●

The accelerator pedal must be held very steady during steady-state driving.

●

If the accelerator pedal is moved, the test must be conducted all over again.

*1: Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then release the accelerator pedal
and keep it released for more than 10 seconds. Depress the accelerator pedal until vehicle speed is 90 km/h
(56 MPH) again.
*2: Operate the vehicle in the following driving pattern.

Decelerate vehicle to 0 km/h (0 MPH) and let engine idle.

Repeat driving pattern shown at right at least 10 times.

–

During acceleration, hold the accelerator pedal as steady as
possible.

*3: Checking the vehicle speed with GST is advised.

Suggested Transmission Gear Position
Set the selector lever in the “D” position.

TEST VALUE AND TEST LIMIT (GST ONLY — NOT APPLICABLE TO CONSULT-II)

The following is the information specified in Mode 6 of SAE J1979.
The test value is a parameter used to determine whether a system/circuit diagnostic test is “OK” or “NG” while
being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the
maximum or minimum value and is compared with the test value being monitored.
Items for which these data (test value and test limit) are displayed are the same as SRT code items (30 test
items).
These data (test value and test limit) are specified by Test ID (TID) and Component ID (CID) and can be dis-
played on the GST screen.

SEF414S

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-81

Revision; 2004 April

2003 Murano

: Applicable

—: Not applicable

HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION
How to Erase DTC

WITH CONSULT-II

The emission related diagnostic information in the ECM can be erased by selecting “ERASE” in the “SELF-
DIAG RESULTS” mode with CONSULT-II.
If DTCs are displayed for both ECM and TCM (Transmission control module), they need to be erased individu-
ally from the ECM and TCM (Transmission control module).

NOTE:
If the DTC is not for CVT related items (see

EC-8

), skip steps 2 through 4.

If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
10 seconds and then turn it “ON” (engine stopped) again.

SRT item

Self-diagnostic test item

Test value (GST display)

Test limit

Application

TID

CID

CATALYST

Three way catalyst function (Bank 1)

01H

Max.

02H

81H

Min.

Three way catalyst function (Bank 2)

03H

02H

Max.

04H

82H

Min.

EVAP SYSTEM

EVAP control system (Small leak)

05H

03H

Max.

EVAP control system purge flow monitoring

06H

83H

Min.

EVAP control system (Very small leak)

07H

03H

Max.

HO2S

Heated oxygen sensor 1 (Bank 1)

09H

04H

Max.

0AH

84H

Min.

0BH

04H

Max.

0CH

04H

Max.

0DH

04H

Max.

Heated oxygen sensor 1 (Bank 2)

11H

05H

Max.

12H

85H

Min.

13H

05H

Max.

14H

05H

Max.

15H

05H

Max.

Heated oxygen sensor 2 (Bank 1)

19H

86H

Min.

1AH

86H

Min.

1BH

06H

Max.

1CH

06H

Max.

Heated oxygen sensor 2 (Bank 2)

21H

87H

Min.

22H

87H

Min.

23H

07H

Max.

24H

07H

Max.

HO2S HTR

Heated oxygen sensor 1 heater (Bank 1)

29H

08H

Max.

2AH

88H

Min.

Heated oxygen sensor 1 heater (Bank 2)

2BH

09H

Max.

2CH

89H

Min.

Heated oxygen sensor 2 heater (Bank 1)

2DH

0AH

Max.

2EH

8AH

Min.

Heated oxygen sensor 2 heater (Bank 2)

2FH

0BH

Max.

30H

8BH

Min.

EC-82

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Revision; 2004 April

2003 Murano

Turn CONSULT-II “ON” and touch “TRANSMISSION”.

Touch “SELF-DIAG RESULTS”.

Touch “ERASE”. [The DTC in the TCM (Transmission control module) will be erased.] Then touch “BACK”
twice.

Touch “ENGINE”.

Touch “SELF-DIAG RESULTS”.

Touch “ERASE”. (The DTC in the ECM will be erased.)

WITH GST

The emission related diagnostic information in the ECM can be erased by selecting Mode 4 with GST.

NOTE:
If the DTC is not for CVT related items (see

EC-8

), skip step 2.

If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
10 seconds and then turn it “ON” (engine stopped) again.

Perform “SELF-DIAGNOSTIC PROCEDURE (Without CONSULT-II)” in CVT section titled “TROUBLE
DIAGNOSIS”, “Self-diagnosis”. (The engine warm-up step can be skipped when performing the diagnosis
only to erase the DTC.)

Select Mode 4 with GST (Generic Scan Tool).

NO TOOLS

If the ignition switch stays "ON" after repair work, be sure to turn ignition switch "OFF" once.

Wait at least 10 seconds and then turn it "ON" (engine stopped) again.

Change the diagnostic test mode from Mode II to Mode I by depressing the accelerator pedal. Refer to

EC-85, "HOW TO SWITCH DIAGNOSTIC TEST MODE"

●

If the battery is disconnected, the emission-related diagnostic information will be lost within 24
hours.

SCIA5442E

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-83

Revision; 2004 April

2003 Murano

●

The following data are cleared when the ECM memory is erased.

–

Diagnostic trouble codes

–

1st trip diagnostic trouble codes

–

Freeze frame data

–

1st trip freeze frame data

–

System readiness test (SRT) codes

–

Test values

–

Others

Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but all
of the data listed above, are cleared from the ECM memory during work procedures.

NVIS (Nissan Vehicle Immobilizer System — NATS)

ABS004AP

●

If the security indicator lights up with the ignition switch in
the “ON” position or “NATS MALFUNCTION” is displayed
on “SELF-DIAG RESULTS” screen, perform self-diagnostic
results mode with CONSULT-II using NATS program card.
Refer to

BL-187, "NVIS (NISSAN VEHICLE IMMOBILIZER

SYSTEM-NATS)"

●

Confirm no self-diagnostic results of NVIS (NATS) is dis-
played before touching “ERASE” in “SELF-DIAG RESULTS”
mode with CONSULT-II.

●

When replacing ECM, initialization of NVIS (NATS) system
and registration of all NVIS (NATS) ignition key IDs must be
carried out with CONSULT-II using NATS program card.
Therefore, be sure to receive all keys from vehicle owner. Regarding the procedures of NVIS
(NATS) initialization and NVIS (NATS) ignition key ID registration, refer to CONSULT-II operation
manual, IVIS/NVIS.

Malfunction Indicator Lamp (MIL)

ABS004AQ

DESCRIPTION

The MIL is located on the instrument panel.

The MIL will light up when the ignition switch is turned ON with-
out the engine running. This is a bulb check.
If the MIL does not light up, refer to

DI-61, "WARNING LAMPS"

or see

EC-650

When the engine is started, the MIL should go off.
If the MIL remains on, the on board diagnostic system has
detected an engine system malfunction.

SEF543X

SEF217U

EC-84

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Revision; 2004 April

2003 Murano

ON BOARD DIAGNOSTIC SYSTEM FUNCTION

The on board diagnostic system has the following four functions.

When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting MIL up when there is
malfunction on engine control system.
Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as
NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means
of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the
driver to repair the malfunction.

MIL Flashing Without DTC

If the ECM is in Diagnostic Test Mode II, MIL may flash when engine is running. In this case, check ECM diag-
nostic test mode.

EC-85, "HOW TO SWITCH DIAGNOSTIC TEST MODE"

How to switch the diagnostic test (function) modes, and details of the above functions are described later.

EC-

85, "HOW TO SWITCH DIAGNOSTIC TEST MODE"

The following emission-related diagnostic information is cleared when the ECM memory is erased.

●

Diagnostic trouble codes

●

1st trip diagnostic trouble codes

●

Freeze frame data

●

1st trip freeze frame data

●

System readiness test (SRT) codes

●

Test values

●

Others

Diagnostic Test
Mode

KEY and ENG.
Status

Function

Explanation of Function

Mode I

Ignition switch in
“ON” position

Engine stopped

BULB CHECK

This function checks the MIL bulb for damage (blown,
open circuit, etc.).
If the MIL does not come on, check MIL circuit.

Engine running

MALFUNCTION
WARNING

This is a usual driving condition. When a malfunction is
detected twice in two consecutive driving cycles (two trip
detection logic), the MIL will light up to inform the driver
that a malfunction has been detected.
The following malfunctions will light up or blink the MIL in
the 1st trip.

●

“Misfire (Possible three way catalyst damage)”

●

“One trip detection diagnoses”

Mode II

Ignition switch in
“ON” position

Engine stopped

SELF-DIAGNOSTIC
RESULTS

This function allows DTCs and 1st trip DTCs to be read.

Engine running

HEATED OXYGEN SENSOR 1
MONITOR

This function allows the fuel mixture condition (lean or
rich), monitored by heated oxygen sensor 1, to be read.

Engine operating condition in fail-safe mode

Engine speed will not rise more than 2,500 rpm due to the fuel cut

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-85

Revision; 2004 April

2003 Murano

HOW TO SWITCH DIAGNOSTIC TEST MODE

NOTE:

●

It is better to count the time accurately with a clock.

●

It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit
has a malfunction.

●

Always ECM returns to Diagnostic Test Mode I after ignition switch is turned “OFF”.

How to Set Diagnostic Test Mode II (Self-diagnostic Results)

Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.

Repeat the following procedure quickly five times within 5 seconds.

Fully depress the accelerator pedal.

Fully release the accelerator pedal.

Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MIL starts
blinking.

Fully release the accelerator pedal.
ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).

How to Set Diagnostic Test Mode II (Heated Oxygen Sensor 1 Monitor)

Set the ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to

EC-85, "How to Set Diagnostic

Test Mode II (Self-diagnostic Results)"

Start Engine.
ECM has entered to Diagnostic Test Mode II (Heated oxygen sensor 1 monitor).
ECM will start heated oxygen sensor 1 monitoring from the bank 1 sensor.

How to Switch Monitored Sensor From Bank 1 to Bank 2 or Vice Versa

Fully depress the accelerator pedal quickly and then release it immediately.

Make sure that monitoring sensor has changed by MIL blinking as follows.

How to Erase Diagnostic Test Mode II (Self-diagnostic Results)

Set ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to

EC-85, "How to Set Diagnostic Test

Mode II (Self-diagnostic Results)"

Fully depress the accelerator pedal and keep it for more than 10 seconds.
The emission-related diagnostic information has been erased from the backup memory in the ECM.

Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.

PBIB0092E

PBIB0093E

EC-86

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Revision; 2004 April

2003 Murano

DIAGNOSTIC TEST MODE I — BULB CHECK

In this mode, the MIL on the instrument panel should stay ON. If it remains OFF, check the bulb. Refer to

DI-

61, "WARNING LAMPS"

or see

EC-650

DIAGNOSTIC TEST MODE I — MALFUNCTION WARNING

These DTC numbers are clarified in Diagnostic Test Mode II (SELF-DIAGNOSTIC RESULTS)

DIAGNOSTIC TEST MODE II — SELF-DIAGNOSTIC RESULTS

In this mode, the DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below.
The DTC and 1st trip DTC are displayed at the same time. If the MIL does not illuminate in diagnostic test
mode I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the MIL
illuminates in diagnostic test mode II (SELF-DIAGNOSTIC RESULTS), it is a DTC; if two or more codes are
displayed, they may be either DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These uniden-
tified codes can be identified by using the CONSULT-II or GST. A DTC will be used as an example for how to
read a code.

A particular trouble code can be identified by the number of four-digit numeral flashes. The “zero” is indicated
by the number of ten flashes. The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds
consisting of an ON (0.6-second) - OFF (0.6-second) cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle.
A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later
numeral appears on the display 1.3 seconds after the former numeral has disappeared.
A change from one trouble code to another occurs at an interval of 1.8-second OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC “0000” refers to no
malfunction. (See

EC-8, "INDEX FOR DTC"

)

How to Erase Diagnostic Test Mode II (Self-diagnostic Results)

The DTC can be erased from the back up memory in the ECM by depressing accelerator pedal. Refer to

EC-

85, "How to Erase Diagnostic Test Mode II (Self-diagnostic Results)"

●

If the battery is disconnected, the DTC will be lost from the backup memory within hours.

●

Be careful not to erase the stored memory before starting trouble diagnoses.

DIAGNOSTIC TEST MODE II — HEATED OXYGEN SENSOR 1 MONITOR

In this mode, the MIL displays the condition of the fuel mixture (lean or rich) which is monitored by the heated
oxygen sensor 1.

MIL

Condition

When the malfunction is detected.

OFF

No malfunction.

PBIA3905E

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-87

Revision; 2004 April

2003 Murano

*: Maintains conditions just before switching to open loop.

To check the heated oxygen sensor 1 function, start engine in the Diagnostic Test Mode II and warm it up until
engine coolant temperature indicator points to the middle of the gauge.
Next run engine at about 2,000 rpm for about 2 minutes under no-load conditions. Then make sure that the
MIL comes ON more than 5 times within 10 seconds with engine running at 2,000 rpm under no-load.

OBD System Operation Chart

ABS004AR

RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS

●

When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are
stored in the ECM memory.

●

When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are
stored in the ECM memory, and the MIL will come on. For details, refer to

EC-68, "Two Trip Detection

Logic"

●

The MIL will go off after the vehicle is driven 3 times with no malfunction. The drive is counted only when
the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs while counting,
the counter will reset.

●

The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A)
without the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and
Fuel Injection System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times
(driving pattern C) without the same malfunction recurring. The “TIME” in “SELF-DIAGNOSTIC
RESULTS” mode of CONSULT-II will count the number of times the vehicle is driven.

●

The 1st trip DTC is not displayed when the self-diagnosis results in “OK” for the 2nd trip.

SUMMARY CHART

For details about patterns “B” and “C” under “Fuel Injection System” and “Misfire”, see

EC-89

For details about patterns “A” and “B” under “Other”, see

EC-91

*1: Clear timing is at the moment OK is detected.
*2: Clear timing is when the same malfunction is detected in the 2nd trip.

MIL

Fuel mixture condition in the exhaust gas

Air fuel ratio feedback control condition

Lean

Closed loop system

OFF

Rich

*Remains ON or OFF

Any condition

Open loop system

Items

Fuel Injection System

Misfire

Other

MIL (goes off)

3 (pattern B)

DTC, Freeze Frame Data (no
display)

80 (pattern C)

40 (pattern A)

1st Trip DTC (clear)

1 (pattern C), *1

1 (pattern B)

1st Trip Freeze Frame Data
(clear)

*1, *2

1 (pattern B)

EC-88

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Revision; 2004 April

2003 Murano

RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS FOR “MISFIRE
” <EXHAUST QUALITY DETERIORATION>, “FUEL INJECTION SYSTEM”

*1: When the same malfunction is

detected in two consecutive trips,
MIL will light up.

*2: MIL will go off after vehicle is driven

3 times (pattern B) without any mal-
functions.

*3: When the same malfunction is

detected in two consecutive trips, the
DTC and the freeze frame data will
be stored in ECM.

*4: The DTC and the freeze frame data

will not be displayed any longer after
vehicle is driven 80 times (pattern C)
without the same malfunction. (The
DTC and the freeze frame data still
remain in ECM.)

*5: When a malfunction is detected for

the first time, the 1st trip DTC and
the 1st trip freeze frame data will be
stored in ECM.

*6: The 1st trip DTC and the 1st trip

freeze frame data will be cleared at
the moment OK is detected.

*7: When the same malfunction is

detected in the 2nd trip, the 1st trip
freeze frame data will be cleared.

*8: 1st trip DTC will be cleared when

vehicle is driven once (pattern C)
without the same malfunction after
DTC is stored in ECM.

SEF392S

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-89

Revision; 2004 April

2003 Murano

EXPLANATION FOR DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUALITY DETERIORA-
TION>”, “FUEL INJECTION SYSTEM”
<Driving Pattern B>

Driving pattern B means the vehicle operation as follows:
All components and systems should be monitored at least once by the OBD system.

●

The B counter will be cleared when the malfunction is detected once regardless of the driving pattern.

●

The B counter will be counted up when driving pattern B is satisfied without any malfunction.

●

The MIL will go off when the B counter reaches 3. (*2 in “OBD SYSTEM OPERATION CHART”)

<Driving Pattern C>

Driving pattern C means the vehicle operation as follows:
The following conditions should be satisfied at the same time:
Engine speed: (Engine speed in the freeze frame data)

375 rpm

Calculated load value: (Calculated load value in the freeze frame data) x (1

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).

Example:
If the stored freeze frame data is as follows:
Engine speed: 850 rpm, Calculated load value: 30%, Engine coolant temperature: 80

C (176

To be satisfied with driving pattern C, the vehicle should run under the following conditions:
Engine speed: 475 - 1,225 rpm, Calculated load value: 27 - 33%, Engine coolant temperature: more than 70

(158

●

The C counter will be cleared when the malfunction is detected regardless of vehicle conditions above.

●

The C counter will be counted up when vehicle conditions above is satisfied without the same malfunction.

●

The DTC will not be displayed after C counter reaches 80.

●

The 1st trip DTC will be cleared when C counter is counted once without the same malfunction after DTC
is stored in ECM.

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-91

Revision; 2004 April

2003 Murano

EXPLANATION FOR DRIVING PATTERNS EXCEPT FOR “MISFIRE <EXHAUST QUALITY
DETERIORATION>”, “FUEL INJECTION SYSTEM”
<Driving Pattern A>

●

The A counter will be cleared when the malfunction is detected regardless of (1) - (4).

●

The A counter will be counted up when (1) - (4) are satisfied without the same malfunction.

●

The DTC will not be displayed after the A counter reaches 40.

<Driving Pattern B>

Driving pattern B means the vehicle operation as follows:
All components and systems should be monitored at least once by the OBD system.

●

The B counter will be cleared when the malfunction is detected once regardless of the driving pattern.

●

The B counter will be counted up when driving pattern B is satisfied without any malfunctions.

●

The MIL will go off when the B counter reaches 3 (*2 in “OBD SYSTEM OPERATION CHART”).

AEC574

EC-92

TROUBLE DIAGNOSIS

Revision; 2004 April

2003 Murano

TROUBLE DIAGNOSIS

PFP:00004

Trouble Diagnosis Introduction

ABS004AS

INTRODUCTION

The engine has an ECM to control major systems such as fuel con-
trol, ignition control, idle air control system, etc. The ECM accepts
input signals from sensors and instantly drives actuators. It is essen-
tial that both input and output signals are proper and stable. At the
same time, it is important that there are no malfunctions such as vac-
uum leaks, fouled spark plugs, or other malfunctions with the engine.

It is much more difficult to diagnose an incident that occurs intermit-
tently rather than continuously. Most intermittent incidents are
caused by poor electric connections or improper wiring. In this case,
careful checking of suspected circuits may help prevent the replace-
ment of good parts.

A visual check only may not find the cause of the incidents. A road
test with CONSULT-II (or GST) or a circuit tester connected should
be performed. Follow the “Work Flow” on

EC-93

Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such incidents, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A “Diagnostic Worksheet” like the exam-
ple on

EC-95

should be used.

Start your diagnosis by looking for “conventional” malfunctions first.
This will help troubleshoot driveability malfunctions on an electroni-
cally controlled engine vehicle.

MEF036D

SEF233G

SEF234G

TROUBLE DIAGNOSIS

EC-93

Revision; 2004 April

2003 Murano

WORK FLOW
Flow Chart

If time data of “SELF-DIAG
RESULTS” is other than “0” or “[1t]”,
perform

EC-151, "TROUBLE DIAG-

NOSIS FOR INTERMITTENT INCI-
DENT"

If the incident cannot be verified, per-
form

EC-151, "TROUBLE DIAGNO-

SIS FOR INTERMITTENT
INCIDENT"

If the on board diagnostic system
cannot be performed, check main
power supply and ground circuit.
Refer to

EC-152, "POWER SUPPLY

CIRCUIT FOR ECM"

If malfunctioning part cannot be
detected, perform

EC-151, "TROU-

BLE DIAGNOSIS FOR INTERMIT-
TENT INCIDENT"

EC-79

EC-147

PBIB1043E

EC-94

TROUBLE DIAGNOSIS

Revision; 2004 April

2003 Murano

Description for Work Flow

DIAGNOSTIC WORKSHEET
Description

There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
bleshooting faster and more accurate.
In general, each customer feels differently about a incident. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the one on the next page in order
to organize all the information for troubleshooting.
Some conditions may cause the MIL to come on steady or blink and
DTC to be detected. Examples:

●

Vehicle ran out of fuel, which caused the engine to misfire.

STEP

DESCRIPTION

STEP I

Get detailed information about the conditions and the environment when the incident/symptom occurred using the
“DIAGNOSTIC WORK SHEET”,

EC-94

STEP II

Before confirming the concern, check and write down (print out using CONSULT-II or GST) the (1st trip) DTC and the
(1st trip) freeze frame data, then erase the DTC and the data. (Refer to

EC-81

.) The (1st trip) DTC and the (1st trip)

freeze frame data can be used when duplicating the incident at STEP III & IV.
If the incident cannot be verified, perform

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

Study the relationship between the cause, specified by (1st trip) DTC, and the symptom described by the customer.
(The “Symptom Matrix Chart” will be useful. See

EC-103

Also check related service bulletins for information.

STEP III

Try to confirm the symptom and under what conditions the incident occurs.
The “DIAGNOSTIC WORK SHEET” and the freeze frame data are useful to verify the incident. Connect CONSULT-II
to the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosis results.
If the incident cannot be verified, perform

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

If the malfunction code is detected, skip STEP IV and perform STEP V.

STEP IV

Try to detect the (1st trip) DTC by driving in (or performing) the “DTC Confirmation Procedure”. Check and read the
(1st trip) DTC and (1st trip) freeze frame data by using CONSULT-II or GST.
During the (1st trip) DTC verification, be sure to connect CONSULT-II to the vehicle in DATA MONITOR (AUTO TRIG)
mode and check real time diagnosis results.
If the incident cannot be verified, perform

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

In case the “DTC Confirmation Procedure” is not available, perform the “Overall Function Check” instead. The (1st
trip) DTC cannot be displayed by this check, however, this simplified “check” is an effective alternative.
The “NG” result of the “Overall Function Check” is the same as the (1st trip) DTC detection.

STEP V

Take the appropriate action based on the results of STEP I through IV.
If the malfunction code is indicated, proceed to TROUBLE DIAGNOSIS FOR DTC PXXXX.
If the normal code is indicated, proceed to the BASIC INSPECTION. (Refer to

EC-99

.) Then perform inspections

according to the Symptom Matrix Chart. (Refer to

EC-103

STEP VI

Identify where to begin diagnosis based on the relationship study between symptom and possible causes. Inspect the
system for mechanical binding, loose connectors or wiring damage using (tracing) “Harness Layouts”.
Gently shake the related connectors, components or wiring harness with CONSULT-II set in “DATA MONITOR
(AUTO TRIG)” mode.
Check the voltage of the related ECM terminals or monitor the output data from the related sensors with CONSULT-II.
Refer to

EC-115

EC-141

The “Diagnostic Procedure” in EC section contains a description based on open circuit inspection. A short circuit
inspection is also required for the circuit check in the Diagnostic Procedure. For details, refer to “Circuit Inspection” in

GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident"

Repair or replace the malfunction parts.
If malfunctioning part cannot be detected, perform

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-

DENT"

STEP VII

Once you have repaired the circuit or replaced a component, you need to run the engine in the same conditions and
circumstances which resulted in the customer's initial complaint.
Perform the “DTC Confirmation Procedure” and confirm the normal code [DTC No. P0000] is detected. If the incident
is still detected in the final check, perform STEP VI by using a method different from the previous one.
Before returning the vehicle to the customer, be sure to erase the unnecessary (already fixed) (1st trip) DTC in ECM
and TCM (Transmission control module). (Refer to

EC-81, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC

INFORMATION"

and

CVT-46, "HOW TO ERASE DTC"

SEF907L

Nissan Murano Z50 (2003 year). Manual - part 85