Nissan Murano Z50 (2004 year). Manual

TROUBLE DIAGNOSIS

EC-95

Revision: 2004 November

2004 Murano

ECM Harness Connector Terminal Layout

ABS004AZ

ECM Terminals and Reference Value

ABS00A5O

PREPARATION

ECM is located behind the glove box. For this inspection,
remove glove box.

Remove ECM harness connector.

When disconnecting ECM harness connector, loosen it with
levers as far as they will go as shown at right.

Connect a break-out box (SST) and Y-cable adapter (SST)
between the ECM and ECM harness connector.

●

Use extreme care not to touch 2 pins at one time.

●

Data is for comparison and may not be exact.

ECM INSPECTION TABLE

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

CAUTION:

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

MBIB0045E

PBIB1299E

PBIB1512E

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

ECM ground

[Engine is running]

●

Idle speed

Body ground

G/B

A/F sensor 1 heater
(bank 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 5V

PBIB1584E

EC-96

TROUBLE DIAGNOSIS

Revision: 2004 November

2004 Murano

Throttle control motor relay
power supply

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

Throttle control motor (Close)

[Ignition switch: ON]

●

Engine stopped

●

Shift lever: D

●

Accelerator pedal is released

0 - 14V

Throttle control motor (Open)

[Ignition switch: ON]

●

Engine stopped

●

Shift lever: D

●

Accelerator pedal is fully depressed

0 - 14V

L/R

Heated oxygen sensor 2
heater (bank 2)

[Engine is running]

●

Engine speed is 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

0 - 1.0V

[Ignition switch: ON]

●

Engine stopped

[Engine is running]

●

Engine speed is above 3,600 rpm

BATTERY VOLTAGE
(11 - 14V)

Intake valve timing control
solenoid valve (bank 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

●

Warm-up condition

●

Engine speed is 2,000 rpm

7 - 12V

Intake valve timing control
solenoid valve (bank 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

●

Warm-up condition

●

Engine speed is 2,000 rpm

7 - 12V

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

PBIB1104E

PBIB1105E

PBIB1790E

TROUBLE DIAGNOSIS

EC-97

Revision: 2004 November

2004 Murano

Power steering pressure sen-
sor

[Engine is running]

●

Steering wheel is being turned

0.5 - 4.5V

[Engine is running]

●

Steering wheel is not being turned

0.4 - 0.8V

Crankshaft position sensor
(POS)

[Engine is running]

●

Warm-up condition

●

Idle speed

NOTE:
The pulse cycle changes depending on rpm
at idle

Approximately 1.6V

[Engine is running]

●

Engine speed is 2,000 rpm

Approximately 1.4V

Camshaft position sensor
(PHASE) (bank 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

NOTE:
The pulse cycle changes depending on rpm
at idle

1.0 - 4.0V

[Engine is running]

●

Engine speed is 2,000 rpm

1.0 - 4.0V

Knock sensor

[Engine is running]

●

Idle speed

Approximately 2.5V

LG/B

A/F sensor 1 (Bank 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 3.1V

O/L

Approximately 2.6V

BR/Y

Approximately 2.3V

Y/R

Approximately 2.3V

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

PBIB1041E

PBIB1042E

PBIB1039E

PBIB1040E

EC-98

TROUBLE DIAGNOSIS

Revision: 2004 November

2004 Murano

21
22
23

L/W
R/Y
R/B

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

[Engine is running]

●

Warm-up condition

●

Idle speed

NOTE:
The pulse cycle changes depending on rpm
at idle

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

●

Warm-up condition

●

Engine speed is 2,000 rpm

BATTERY VOLTAGE

(11 - 14V)

A/F sensor 1 heater
(Bank 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 5V

P/L

Heated oxygen sensor 2
heater (bank 1)

[Engine is running]

●

Engine speed is 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

0 - 1.0V

[Ignition switch: ON]

●

Engine stopped

[Engine is running]

●

Engine speed is above 3,600 rpm

BATTERY VOLTAGE
(11 - 14V)

G/Y

VIAS control solenoid valve

[Engine is running]

●

Idle speed

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

●

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

0 - 1.0V

EVAP control system pres-
sure sensor

[Ignition switch: ON]

Approximately 1.8 - 4.8V

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

SEC984C

SEC985C

PBIB1584E

TROUBLE DIAGNOSIS

EC-99

Revision: 2004 November

2004 Murano

Camshaft position sensor
(PHASE) (bank 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

NOTE:
The pulse cycle changes depending on rpm
at idle

1.0 - 4.0V

[Engine is running]

●

Engine speed is 2,000 rpm

1.0 - 4.0V

Y/G

Intake air temperature sensor

[Engine is running]

Approximately 0 - 4.8V
Output voltage varies with intake
air temperature.

40
41
42

R/G
L/Y
W/L

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

[Engine is running]

●

Warm-up condition

●

Idle speed

NOTE:
The pulse cycle changes depending on rpm
at idle

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

●

Warm-up condition

●

Engine speed is 2,000 rpm

BATTERY VOLTAGE

(11 - 14V)

BR/W

Electronic controlled engine
mount-1

[Engine is running]

●

Engine speed is above 950 rpm.

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

●

For 2 seconds after engine speed is 950
rpm or less.

0 - 1.0V

[Engine is running]

●

2 seconds after engine speed is 950 rpm or
less.

2.0 - 3.0V

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

PBIB1039E

PBIB1040E

SEC984C

SEC985C

EC-100

TROUBLE DIAGNOSIS

Revision: 2004 November

2004 Murano

GR/L

EVAP canister purge volume
control solenoid valve

[Engine is running]

●

Idle speed

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

●

Engine speed is about 2,000 rpm (More
than 100 seconds after starting engine)

BATTERY VOLTAGE

(11 - 14V)

Sensor power supply (Throt-
tle position sensor)

[Ignition switch: ON]

Approximately 5V

G/O

Sensor power supply
(EVAP control system pres-
sure sensor)

[Ignition switch: ON]

Approximately 5V

R/W

Sensor power supply
(Refrigerant pressure sensor)

[Ignition switch: ON]

Approximately 5V

Throttle position sensor 1

[Ignition switch: ON]

●

Engine stopped

●

Shift lever: D

●

Accelerator pedal fully released

More than 0.36V

[Ignition switch: ON]

●

Engine stopped

●

Shift lever: D

●

Accelerator pedal fully depressed

Less than 4.75V

G/W

Mass air flow sensor

[Engine is running]

●

Warm-up condition

●

Idle speed

1.1 - 1.5V

[Engine is running]

●

Warm-up condition

●

Engine speed is 2,500 rpm

1.6 - 2.4V

Heated oxygen sensor 2
(bank 2)

[Engine is running]

●

Warm-up condition

●

Revving engine from idle to 3,000 rpm
quickly after the following conditions are
met.

–

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

0 - Approximately 1.0V

A/F sensor 1 (Bank 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 2.6V

Approximately 2.3V

G/Y

Approximately 3.1V

Approximately 2.3V

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

SEC990C

SEC991C

TROUBLE DIAGNOSIS

EC-101

Revision: 2004 November

2004 Murano

60
61
62

BR/R
L/R
Y/R

Ignition signal No. 5
Ignition signal No. 3
Ignition signal No. 1

[Engine is running]

●

Warm-up condition

●

Idle speed

NOTE:
The pulse cycle changes depending on rpm
at idle

0 - 0.3V

[Engine is running]

●

Warm-up condition

●

Engine speed is 2,500 rpm

0.1 - 0.6V

W/R

Electronic controlled engine
mount-2

[Engine is running]

●

Engine speed is below 950 rpm.

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

●

For 2 seconds after engine speed is 950
rpm or more.

0 - 1.0V

[Engine is running]

●

2 seconds after engine speed is 950 rpm or
more.

2.0 - 3.0V

Sensor ground
(Throttle position sensor)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

Sensor ground
(ECT sensor / MAF sensor /
IAT sensor / PSP sensor /
EVAP control system pres-
sure sensor / ASCD steering
switch / Refrigerant pressure
sensor)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

W/G

Sensor power supply
(PSP sensor)

[Ignition switch: ON]

Approximately 5V

Throttle position sensor 2

[Ignition switch: ON]

●

Engine stopped

●

Shift lever: D

●

Accelerator pedal fully released

Less than 4.75V

[Ignition switch: ON]

●

Engine stopped

●

Shift lever: D

●

Accelerator pedal fully depressed

More than 0.36V

Refrigerant pressure sensor

[Engine is running]

●

Warm-up condition

●

Both A/C switch and blower switch are ON
(Compressor operates.)

1.0 - 4.0V

Y/B

Engine coolant temperature
sensor

[Engine is running]

Approximately 0 - 4.8V
Output voltage varies with
engine coolant temperature.

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

SEC986C

SEC987C

EC-102

TROUBLE DIAGNOSIS

Revision: 2004 November

2004 Murano

Heated oxygen sensor 2
(bank 1)

[Engine is running]

●

Warm-up condition

●

Revving engine from idle to 3,000 rpm
quickly after the following conditions are
met

–

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

0 - Approximately 1.0V

Sensor ground
(Heated oxygen sensor 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

79
80
81

GR/R
GR
G/R

Ignition signal No. 6
Ignition signal No. 4
Ignition signal No. 2

[Engine is running]

●

Warm-up condition

●

Idle speed

NOTE:
The pulse cycle changes depending on rpm
at idle

0 - 0.3V

[Engine is running]

●

Warm-up condition

●

Engine speed is 2,500 rpm

0.1 - 0.6V

Sensor ground
(APP sensor 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

Sensor ground
(APP sensor 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

Data link connector

[Ignition switch: ON]

●

CONSULT-II is disconnected

Approximately 5V - Battery volt-
age (11 - 14V)

CAN communication line

[Ignition switch: ON]

Approximately 1.1 - 2.3V
Output voltage varies with the
communication status

R/W

Sensor power supply
(APP sensor 1)

[Ignition switch: ON]

Approximately 5V

Sensor power supply
(APP sensor 2)

[Ignition switch: ON]

Approximately 5V

CAN communication line

[Ignition switch: ON]

Approximately 2.6 - 3.2V
Output voltage varies with the
communication status.

W/R

Accelerator pedal position
sensor 2

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal fully released

0.25 - 0.50V

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal fully depressed

2.0 - 2.5V

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

SEC986C

SEC987C

TROUBLE DIAGNOSIS

EC-103

Revision: 2004 November

2004 Murano

G/Y

ASCD steering switch

[Ignition switch: ON]

●

ASCD steering switch: OFF

Approximately 4V

[Ignition switch: ON]

●

ON/OFF (MAIN) switch: Pressed

Approximately 0V

[Ignition switch: ON]

●

CANCEL switch: Pressed

Approximately 1V

[Ignition switch: ON]

●

COAST/SET switch: Pressed

Approximately 2V

[Ignition switch: ON]

●

ACCEL/RESUME switch: Pressed

Approximately 3V

101

R/G

Stop lamp switch

[Ignition switch: OFF]

●

Brake pedal is fully released

Approximately 0V

[Ignition switch: OFF]

●

Brake pedal is depressed

BATTERY VOLTAGE
(11 - 14V)

102

G/W

PNP switch

[Ignition switch: ON]

●

Shift lever: P or N

Approximately 0V

[Ignition switch: ON]

●

Except the above gear position

BATTERY VOLTAGE
(11 - 14V)

104

P/L

Throttle control motor relay

[Ignition switch: OFF]

BATTERY VOLTAGE
(11 - 14V)

[Ignition switch: ON]

0 - 1.0V

106

Accelerator pedal position
sensor 1

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal fully released

0.5 - 1.0V

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal fully depressed

4.2 - 4.8V

107

R/Y

Fuel tank temperature sensor

[Engine is running]

Approximately 0 - 4.8V
Output voltage varies with fuel
tank temperature.

108

L/B

ASCD brake switch

[Ignition switch: ON]

●

Brake pedal is depressed

Approximately 0V

[Ignition switch: ON]

●

Brake pedal is fully released

BATTERY VOLTAGE
(11 - 14V)

109

Ignition switch

[Ignition switch: OFF]

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

111

W/B

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch: OFF]

●

For a few seconds after turning ignition
switch OFF

0 - 1.5V

[Ignition switch: OFF]

●

A few seconds passed after turning ignition
switch OFF

BATTERY VOLTAGE
(11 - 14V)

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

EC-104

TROUBLE DIAGNOSIS

Revision: 2004 November

2004 Murano

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

113

B/P

Fuel pump relay

[Ignition switch: ON]

●

For 1 second after turning ignition switch
ON

[Engine is running]

0 - 1.5V

[Ignition switch: ON]

●

More than 1 second after turning ignition
switch ON

BATTERY VOLTAGE
(11 - 14V)

115
116

B
B

ECM ground

[Engine is running]

●

Idle speed

Body ground

117

EVAP canister vent control
valve

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

119

120

R/B
R/B

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

121

W/L

Power supply for ECM (Back-
up)

[Ignition switch: OFF]

BATTERY VOLTAGE
(11 - 14V)

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

TROUBLE DIAGNOSIS

EC-105

Revision: 2004 November

2004 Murano

CONSULT-II Function

ABS004B1

FUNCTION

*: 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

Function

Work support

This mode enables a technician to adjust some devices faster and more accurately by following the
indications on the CONSULT-II unit.

Self-diagnostic results

Self-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data
can be read and erased quickly.*

Data monitor

Input/Output data in the ECM can be read.

Data monitor (SPEC)

Input/Output of the specification for Basic fuel schedule, AFM, A/F feedback control value and the
other data monitor items can be read.

CAN diagnostic support
monitor

The results of transmit/receive diagnosis of CAN communication can be read.

Active test

Diagnostic Test Mode in which CONSULT-II drives some actuators apart from the ECMs and also
shifts some parameters in a specified range.

DTC & SRT confirmation

The status of system monitoring tests and the self-diagnosis status/result can be confirmed.

Function test

This mode is used to inform customers when their vehicle condition requires periodic maintenance.

ECM part number

ECM part number can be read.

EC-106

TROUBLE DIAGNOSIS

Revision: 2004 November

2004 Murano

ENGINE CONTROL COMPONENT PARTS/CONTROL SYSTEMS APPLICATION

Item

DIAGNOSTIC TEST MODE

WORK

SUP-

PORT

SELF-DIAGNOSTIC

RESULTS

DATA

MONI-

TOR

DATA

MONI-

TOR

(SPEC)

ACTIVE

TEST

DTC & SRT

CONFIRMATION

DTC*1

FREEZE

FRAME
DATA*2

SRT

STATUS

DTC

WORK

SUP-

PORT

ENGI

NE CONTROL

COMPONENT P

ARTS

INPUT

Crankshaft position sensor (POS)

Camshaft position sensor (PHASE)

Mass air flow sensor

Engine coolant temperature sensor

A/F sensor 1

Heated oxygen sensor 2

Vehicle speed sensor

Accelerator pedal position sensor

Throttle position sensor

Fuel tank temperature sensor

EVAP control system pressure
sensor

Intake air temperature sensor

Knock sensor

Refrigerant pressure sensor

Closed throttle position switch
(accelerator pedal position sensor
signal)

Air conditioner switch

Park/neutral position (PNP) switch

Stop lamp switch

Power steering pressure sensor

Battery voltage

Load signal

Primary speed sensor

Fuel level sensor

ASCD steering switch

ASCD brake switch

TROUBLE DIAGNOSIS

EC-107

Revision: 2004 November

2004 Murano

X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to

EC-53

INSPECTION PROCEDURE

CAUTION:

If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
1.

Turn ignition switch OFF.

Connect “CONSULT-II” and “CONSULT-II CONVERTER” to
data link connector, which is located under LH dash panel near
the hood opener handle.

Turn ignition switch ON.

ENGINE CONTROL

COMPONENT P

ARTS

OUTPUT

Injectors

Power transistor (Ignition timing)

Throttle control motor relay

Throttle control motor

EVAP canister purge volume con-
trol solenoid valve

Air conditioner relay

Fuel pump relay

Cooling fan relay

A/F sensor 1 heater

Heated oxygen sensor 2 heater

EVAP canister vent control valve

Intake valve timing control solenoid
valve

VIAS control solenoid valve

Electronic controlled engine mount

Calculated load value

Item

DIAGNOSTIC TEST MODE

WORK

SUP-

PORT

SELF-DIAGNOSTIC

RESULTS

DATA

MONI-

TOR

DATA

MONI-

TOR

(SPEC)

ACTIVE

TEST

DTC & SRT

CONFIRMATION

DTC*1

FREEZE

FRAME
DATA*2

SRT

STATUS

DTC

WORK

SUP-

PORT

PBIB1300E

EC-108

TROUBLE DIAGNOSIS

Revision: 2004 November

2004 Murano

Touch “START (NISSAN BASED VHCL)”.

Touch “ENGINE”.
If “ENGINE” is not indicated, go to

GI-39, "CONSULT-II Data

Link Connector (DLC) Circuit"

Perform each diagnostic test mode according to each service
procedure.

For further information, see the CONSULT-II Operation Manual.

WORK SUPPORT MODE
Work Item

MBIB0233E

SEF995X

PBIB2308E

WORK ITEM

CONDITION

USAGE

FUEL PRESSURE RELEASE

●

FUEL PUMP WILL STOP BY TOUCHING “START” DUR-
ING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.

When releasing fuel pressure
from fuel line

IDLE AIR VOL LEARN

●

THE IDLE AIR VOLUME THAT KEEPS THE ENGINE
WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM.

When learning the idle air volume

SELF-LEARNING CONT

●

THE COEFFICIENT OF SELF-LEARNING CONTROL
MIXTURE RATIO RETURNS TO THE ORIGINAL COEF-
FICIENT.

When clearing the coefficient of
self-learning control value

TROUBLE DIAGNOSIS

EC-109

Revision: 2004 November

2004 Murano

*: This function is not necessary in the usual service procedure.

SELF-DIAG RESULTS MODE
Self Diagnostic Item

Regarding items of “DTC and 1st trip DTC”, refer to

EC-8, "INDEX FOR DTC"

Freeze Frame Data and 1st Trip Freeze Frame Data

EVAP SYSTEM CLOSE

CLOSE THE EVAP CANISTER VENT CONTROL VALVE IN
ORDER TO MAKE EVAP SYSTEM CLOSE UNDER THE
FOLLOWING CONDITIONS.

●

IGN SW ON

●

ENGINE NOT RUNNING

●

AMBIENT TEMPERATURE IS ABOVE 0

C (32

F).

●

NO VACUUM AND NO HIGH PRESSURE IN EVAP SYS-
TEM

●

FUEL TANK TEMP. IS MORE THAN 0

C (32

F).

●

WITHIN 10 MINUTES AFTER STARTING “EVAP SYS-
TEM CLOSE”

●

WHEN TRYING TO EXECUTE “EVAP SYSTEM CLOSE”
UNDER THE CONDITION EXCEPT ABOVE, CONSULT-
II WILL DISCONTINUE IT AND DISPLAY APPROPRI-
ATE INSTRUCTION.

NOTE:
WHEN STARTING ENGINE, CONSULT-II MAY DISPLAY
“BATTERY VOLTAGE IS LOW. CHARGE BATTERY”,
EVEN IN USING CHARGED BATTERY.

When detecting EVAP vapor leak
point of EVAP system

TARGET IDLE RPM ADJ*

●

IDLE CONDITION

When setting target idle speed

TARGET IGN TIM ADJ*

●

IDLE CONDITION

When adjusting target ignition tim-
ing

WORK ITEM

CONDITION

USAGE

Freeze frame data

item*

Description

DIAG TROUBLE
CODE
[PXXXX]

●

The engine control component part/control system has a trouble code, it is displayed as “PXXXX”. (Refer
to

EC-8, "INDEX FOR DTC"

FUEL SYS-B1

●

“Fuel injection system status” at the moment a malfunction is detected is displayed.

●

One mode in the following is displayed.
“Mode2”: Open loop due to detected system malfunction
“Mode3”: Open loop due to driving conditions (power enrichment, deceleration enleanment)
“Mode4”: Closed loop - using oxygen sensor(s) as feedback for fuel control
“Mode5”: Open loop - has not yet satisfied condition to go to closed loop

FUEL SYS-B2

CAL/LD VALUE [%]

●

The calculated load value at the moment a malfunction is detected is displayed.

COOLANT TEMP [

or [

●

The engine coolant temperature at the moment a malfunction is detected is displayed.

L-FUEL TRM-B1 [%]

●

“Long-term fuel trim” at the moment a malfunction is detected is displayed.

●

The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule
than short-term fuel trim.

L-FUEL TRM-B2 [%]

S-FUEL TRM-B1 [%]

●

“Short-term fuel trim” at the moment a malfunction is detected is displayed.

●

The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel
schedule.

S-FUEL TRM-B2 [%]

ENGINE SPEED
[rpm]

●

The engine speed at the moment a malfunction is detected is displayed.

VEHICL SPEED [km/
h] or [mph]

●

The vehicle speed at the moment a malfunction is detected is displayed.

EC-110

TROUBLE DIAGNOSIS

Revision: 2004 November

2004 Murano

*: The items are the same as those of 1st trip freeze frame data.

DATA MONITOR MODE
Monitored Item

: Applicable

B/FUEL SCHDL
[msec]

●

The base fuel schedule at the moment a malfunction is detected is displayed.

INT/A TEMP SE [

or [

●

The intake air temperature at the moment a malfunction is detected is displayed.

Freeze frame data

item*

Description

Monitored item [Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

ENG SPEED [rpm]

●

Indicates the engine speed computed
from the signal of the crankshaft posi-
tion sensor (POS) and camshaft posi-
tion sensor (PHASE).

●

Accuracy becomes poor if engine speed
drops below the idle rpm.

●

If the signal is interrupted while the
engine is running, an abnormal value
may be indicated.

MAS A/F SE-B1 [V]

●

The signal voltage of the mass air flow
sensor is displayed.

●

When the engine is stopped, a certain
value is indicated.

B/FUEL SCHDL
[msec]

●

Base fuel schedule indicates the fuel
injection pulse width programmed into
ECM, prior to any learned on board cor-
rection.

A/F ALPHA-B1 [%]

●

The mean value of the air-fuel ratio
feedback correction factor per cycle is
indicated.

●

When the engine is stopped, a certain
value is indicated.

●

This data also includes the data for the
air-fuel ratio learning control.

A/F ALPHA-B2 [%]

COOLAN TEMP/S [

or [

●

The engine coolant temperature (deter-
mined by the signal voltage of the
engine coolant temperature sensor) is
displayed.

●

When the engine coolant temperature
sensor is open or short-circuited, ECM
enters fail-safe mode. The engine cool-
ant temperature determined by the ECM
is displayed.

A/F SEN1 (B1) [V]

●

The A/F signal computed from the input
signal of the A/F sensor 1 is displayed.

A/F SEN1 (B2) [V]

HO2S2 (B1) [V]

●

The signal voltage of the heated oxygen
sensor 2 is displayed.

HO2S2 (B2) [V]

HO2S2 MNTR (B1)
[RICH/LEAN]

●

Display of heated oxygen sensor 2 sig-
nal:
RICH ... means the amount of oxygen
after three way catalyst is relatively
small.
LEAN ... means the amount of oxygen
after three way catalyst is relatively
large.

●

When the engine is stopped, a certain
value is indicated.

HO2S2 MNTR (B2)
[RICH/LEAN]

VHCL SPEED SE [km/
h] or [mph]

●

The vehicle speed computed from the
vehicle speed signal sent from combi-
nation meter is displayed.

BATTERY VOLT [V]

●

The power supply voltage of ECM is
displayed.

ACCEL SEN 1 [V]

●

The accelerator pedal position sensor
signal voltage is displayed.

●

ACCEL SEN2 signal is converteds by
ECM internally. Thus, it differs from ECM
terminal voltage signal.

ACCEL SEN 2 [V]

Nissan Murano Z50 (2004 year). Manual - part 74