Nissan Murano Z50 (2003 year). Manual - part 119

FUEL PUMP CIRCUIT

EC-623

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FUEL PUMP CIRCUIT

PFP:17042

Description

ABS004OK

SYSTEM DESCRIPTION

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

The ECM activates the fuel pump for 1 second after the ignition switch is turned on to improve engine startabil-
ity. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows that the
engine is rotating, and causes the pump to operate. If the engine speed signal is not received when the igni-
tion switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging, thereby
improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay,
which in turn controls the fuel pump.

COMPONENT DESCRIPTION

A turbine type design fuel pump is used in the furl tank.

CONSULT-II Reference Value in Data Monitor Mode

ABS004OL

Specification data are reference values.

Sensor

Input Signal to ECM

ECM Function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

Fuel pump control

Fuel pump relay

Battery

Battery voltage*

Condition

Fuel pump operation

Ignition switch is turned to ON.

Operates for 1 second.

Engine running and cranking

Operates.

When engine is stopped

Stops in 1.5 seconds.

Except as shown above

Stops.

PBIB1356E

MONITOR ITEM

CONDITION

SPECIFICATION

FUEL PUMP RLY

●

For 1 second after turning ignition switch ON

●

Engine running or cranking

ON

●

Except above conditions

OFF

EC-624

FUEL PUMP CIRCUIT

Revision; 2004 April

2003 Murano

Wiring Diagram

ABS004OM

TBWA0391E

FUEL PUMP CIRCUIT

EC-625

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Specification data are reference values and are measured between each terminal and ground.

CAUTION:

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

Diagnostic Procedure

ABS004ON

1. 

CHECK OVERALL FUNCTION

1.

Turn ignition switch “ON”.

2.

Pinch fuel feed hose with two fingers.
Fuel pressure pulsation should be felt on the fuel feed hose
for 1 second after ignition switch is turned “ON”.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2. 

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch “OFF”.

2.

Disconnect ECM harness connector.

3.

Turn ignition switch “ON”.

4.

Check voltage between ECM terminal 113 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

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)

PBIB1378E

Voltage: Battery voltage 

PBIB1187E

EC-626

FUEL PUMP CIRCUIT

Revision; 2004 April

2003 Murano

3. 

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch “ON”.

2.

Check voltage between IPDM E/R terminal 20 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 12.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E109, M6

●

Harness for open or short between IPDM E/R and ECM

>> Repair harness or connectors.

5. 

CHECK CONDENSER POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch “OFF”.

2.

Reconnect all harness connectors disconnected.

3.

Disconnect condenser harness connector.

4.

Turn ignition switch “ON”.

5.

Check voltage between condenser terminal 1 and ground with
CONSULT-II or tester. 

6.

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

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 6.

6. 

CHECK 15A FUSE

1.

Turn ignition switch “OFF”.

2.

Disconnect 15A fuse.

3.

Check 15A fuse.

OK or NG

OK

>> GO TO 7.

NG

>> Replace fuse.

Voltage: Battery voltage

PBIB1397E

Voltage:

Battery voltage should exist for 1 second 
after ignition switch is turned “ON”.

PBIB0624E

FUEL PUMP CIRCUIT

EC-627

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7. 

CHECK CONDENSER POWER SUPPLY CIRCUIT-II

1.

Disconnect IPDM E/R harness connector E7.

2.

Check harness continuity between IPDM E/R terminal 23 and condenser terminal 1.
Refer to Wiring Diagram. 

3.

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

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 8.

8. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E106, B5

●

Harness for open or short between IPDM E/R and condenser

>> Repair harness or connectors.

9. 

CHECK CONDENSER GROUND CIRCUIT

1.

Check harness continuity between condenser terminal 2 and ground.
Refer to Wiring Diagram.

2.

Also check harness for short to power.

OK or NG

OK

>> GO TO 10.

NG

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

10. 

CHECK CONDENSER

Refer to 

EC-628, "Component Inspection"

 .

OK or NG

OK

>> GO TO 11.

NG

>> Replace condenser.

11. 

CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch “OFF”.

2.

Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.

3.

Check harness continuity between “fuel level sensor unit and
fuel pump” terminal 1 and harness connector B5 terminal 1, “fuel
level sensor unit and fuel pump” terminal 3 and ground.
Refer to Wiring Diagram. 

4.

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

OK or NG

OK

>> GO TO 12.

NG

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

Continuity should exist.

Continuity should exist.

Continuity should exist.

PBIB1357E

EC-628

FUEL PUMP CIRCUIT

Revision; 2004 April

2003 Murano

12. 

CHECK FUEL PUMP

Refer to 

EC-628, "Component Inspection"

 .

OK or NG

OK

>> GO TO 13.

NG

>> Replace fuel pump.

13. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

OK or NG

OK

>> Replace IPDM E/R.

NG

>> Repair or replace harness or connectors.

Component Inspection

ABS004OO

FUEL PUMP

1.

Disconnect fuel level sensor unit and fuel pump harness connector.

2.

Check resistance between fuel level sensor unit and fuel pump
terminals 1 and 3.

CONDENSER

1.

Turn ignition switch “OFF”.

2.

Disconnect condenser harness connector.

3.

Check resistance between condenser terminals 1 and 2.

Removal and Installation

ABS004OP

FUEL PUMP

Refer to 

FL-5, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY"

 .

Resistance: 0.2 – 5.0

Ω

 [at 25

°

C (77

°

F)]

SEC918C

Resistance

Above 1 M

Ω

 at 25

°

C (77

°

F)

PBIB0794E

ELECTRONIC CONTROLLED ENGINE MOUNT

EC-629

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ELECTRONIC CONTROLLED ENGINE MOUNT

PFP:11270

System Description

ABS004OQ

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

The ECM controls the engine mount operation corresponding to the engine speed and the vehicle speed. The
control system has 2-step control [Soft/Hard]

CONSULT-II Reference Value in Data Monitor Mode

ABS004VS

Specification data are reference values.

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed

Engine mount 
control

Electronic controlled engine 
mount

Vehicle speed sensor

Vehicle speed*

Vehicle condition

Engine mount control

Idle (with vehicle stopped)

Soft

Except above conditions

Hard

MONITOR ITEM

CONDITION

SPECIFICATION

ENGINE MOUNT

●

Engine: After warming up

Idle (with vehicle stopped)

IDLE

Except above conditions

TRVL

EC-630

ELECTRONIC CONTROLLED ENGINE MOUNT

Revision; 2004 April

2003 Murano

Wiring Diagram

ABS004OS

TBWA0396E

ELECTRONIC CONTROLLED ENGINE MOUNT

EC-631

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Revision; 2004 April

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Specification data are reference values and are measured between each terminal and ground.

CAUTION:

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

Diagnostic Procedure

ABS004OT

1. 

INSPECTION START

Do you have CONSULT-II?

Yes or No

Yes

>> GO TO 2.

No

>> GO TO 3.

2. 

CHECK OVERALL FUNCTION

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “ENGINE MOUNTING” in “ACTIVE TEST” mode with
CONSULT-II and touch “ON/OFF” on the CONSULT-II screen.

3.

Check that the motor operating sound is heard from front elec-
tronic controlled engine mount for about 0.5 seconds according
to the switching condition of “ENGINE MOUNTING”.

OK or NG

OK

>> INSPECTION END

NG >> GO 

TO 

4.

3. 

CHECK OVERALL FUNCTION

 Without CONSULT-II

1.

Make sure that gear position is “P” or “N”.

2.

Start engine and let it idle.

3.

Change the engine speed from idle to more than 1,000 rpm and then return to idle (with vehicle stopped).

4.

Check that the motor operating sound is heard from front electronic controlled engine mount for about 0.5
seconds when changing engine speed.
It is better to hear the operating sound around the left side front wheel house.

OK or NG

OK

>> INSPECTION END

NG >> GO 

TO 

4.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

44

BR/W

Electronic controlled engine 
mount-1

[Engine is running]

●

Idle speed

0 - 3.0V

[Engine is running]

●

Except the above

BATTERY VOLTAGE
(11 - 14V)

63

W/R

Electronic controlled engine 
mount-2

[Engine is running]

●

Idle speed

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

●

Except the above

0 - 3.0V

SEC237C

EC-632

ELECTRONIC CONTROLLED ENGINE MOUNT

Revision; 2004 April

2003 Murano

4. 

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT POWER SUPPLY CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect front or rear electronic controlled engine mount harness connector.

3.

Check voltage between electronic controlled engine mount ter-
minal 3 and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M82, F102

●

10A fuse

●

Harness for open and short between electronic controlled engine mount and battery

>> Repair harness or connectors.

6. 

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT OUTPUT SIGNAL CIRCUIT FOR OPEN AND 

SHORT

1.

Turn ignition switch “OFF”.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminals and electronic engine mount terminals as follows.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 7.

NG

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

PBIB1373E

Voltage: Battery voltage

SEC920C

ECM terminal

Front electronic controlled engine mount 

terminal

Rear electronic controlled engine mount 

terminal (AWD models)

44

1

1

63

2

2

Continuity should exist.

ELECTRONIC CONTROLLED ENGINE MOUNT

EC-633

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7. 

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT

Visually check front and rear electronic controlled engine mount.

OK or NG

OK

>> GO TO 8.

NG

>> Replace front or rear electronic controlled engine mount.

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

EC-634

REFRIGERANT PRESSURE SENSOR

Revision; 2004 April

2003 Murano

REFRIGERANT PRESSURE SENSOR

PFP:92136

Component Description

ABS004OU

The refrigerant pressure sensor is installed at the liquid tank of the
air conditioner system. The sensor uses an electrostatic volume
pressure transducer to convert refrigerant pressure to voltage. The
voltage signal is sent to ECM, and ECM controls cooling fan system.

PBIB1372E

SEF099XA

REFRIGERANT PRESSURE SENSOR

EC-635

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Revision; 2004 April

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Wiring Diagram

ABS004OV

TBWA0392E

EC-636

REFRIGERANT PRESSURE SENSOR

Revision; 2004 April

2003 Murano

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

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

Diagnostic Procedure

ABS004OW

1. 

CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION

1.

Start engine and warm it up to normal operating temperature.

2.

Turn A/C switch and blower switch “ON”.

3.

Check voltage between ECM terminal 70 and ground with CON-
SULT-II or tester.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

49

R/W

Sensors' power supply
(Refrigerant pressure sen-
sor)

[Ignition switch “ON”]

Approximately 5V

67

B

Sensors' ground
(MAF sensor / IAT sensor / 
PSP sensor / EVAP control 
system pressure sensor / 
ASCD steering switch / 
Refrigerant pressure sen-
sor)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

70

W

Refrigerant pressure sensor

[Engine is running]

●

Warm-up condition

●

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

1.0 - 4.0V

Voltage: 1.0 - 4.0V

PBIB1188E

REFRIGERANT PRESSURE SENSOR

EC-637

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2. 

CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT

1.

Turn A/C switch and blower switch “OFF”.

2.

Stop engine.

3.

Disconnect refrigerant pressure sensor harness connector.

4.

Turn ignition switch “ON”.

5.

Check voltage between refrigerant pressure sensor terminal 1
and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E19, F3

●

Harness for open or short between ECM and refrigerant pressure sensor

>> Repair harness or connectors.

4. 

CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch “OFF”.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between refrigerant pressure sensor terminal 3 and ECM terminal 67.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

PBIB1372E

Voltage: Approximately 5V

PBIB0188E

Continuity should exist.

EC-638

REFRIGERANT PRESSURE SENSOR

Revision; 2004 April

2003 Murano

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E19, F3

●

Joint connector-3

●

Harness for open or short between ECM and refrigerant pressure sensor

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

6. 

CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between ECM terminal 70 and refrigerant pressure sensor terminal 2.
Refer to Wiring Diagram.

2.

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

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E19, F3

●

Harness for open or short between ECM and refrigerant pressure sensor

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

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

OK or NG

OK

>> Replace refrigerant pressure sensor.

NG

>> Repair or replace. 

Removal and Installation

ABS004OX

REFRIGERANT PRESSURE SENSOR

Refer to 

ATC-164, "Removal and Installation of Refrigerant Pressure Sensor"

  .

Continuity should exist.