Nissan Murano Z50 (2007 year). Manual - part 105

FUEL PUMP

EC-629

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Revision: 2006 July

2007 Murano

FUEL PUMP

PFP:17042

Description

NBS003DX

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 start-
ability. 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
ignition 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 fuel tank.

CONSULT-II Reference Value in Data Monitor Mode

NBS003DY

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-630

FUEL PUMP

Revision: 2006 July

2007 Murano

Wiring Diagram

NBS003DZ

TBWB0821E

FUEL PUMP

EC-631

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Revision: 2006 July

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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

NBS003E0

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-632

FUEL PUMP

Revision: 2006 July

2007 Murano

3. 

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector E8.

3.

Check harness continuity between IPDM E/R terminal 40 and ECM terminal 113.

4.

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

OK or NG

OK

>> GO TO 13.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E109, M6

●

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

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

Continuity should exist.

Voltage:

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

PBIB0624E

FUEL PUMP

EC-633

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Revision: 2006 July

2007 Murano

7. 

CHECK CONDENSER POWER SUPPLY CIRCUIT-II

1.

Disconnect IPDM E/R harness connector E8.

2.

Check harness continuity between IPDM E/R terminal 39 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 13.

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 open circuit or short to ground or short to power in 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-634, "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 ground or short to power in harness or connectors.

Continuity should exist.

Continuity should exist.

Continuity should exist.

PBIB1357E

EC-634

FUEL PUMP

Revision: 2006 July

2007 Murano

12. 

CHECK FUEL PUMP

Refer to 

EC-634, "Component Inspection"

 .

OK or NG

OK

>> GO TO 13.

NG

>> Replace “fuel level sensor unit and fuel pump”.

13. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-141, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

OK or NG

OK

>> Replace IPDM E/R.

NG

>> Repair or replace harness or connectors.

Component Inspection

NBS003E1

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

NBS003E2

FUEL PUMP

Refer to 

FL-4, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY"

 .

Resistance: Approximately 0.2 - 5.0

Ω

 [at 25

°

C (77

°

F)]

SEC918C

Resistance

Above 1 M

Ω

 [at 25

°

C (77

°

F)]

PBIB0794E

IGNITION SIGNAL

EC-635

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Revision: 2006 July

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IGNITION SIGNAL

PFP:22448

Component Description

NBS003DG

IGNITION COIL & POWER TRANSISTOR

The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns
ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil
secondary circuit.

PBIB1370E

EC-636

IGNITION SIGNAL

Revision: 2006 July

2007 Murano

Wiring Diagram

NBS003DH

TBWB0817E

IGNITION SIGNAL

EC-637

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Revision: 2006 July

2007 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.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

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]

●

More than a few seconds after turning igni-
tion switch OFF

BATTERY VOLTAGE
(11 - 14V)

119

120

R/B
R/B

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

EC-638

IGNITION SIGNAL

Revision: 2006 July

2007 Murano

TBWB0818E

IGNITION SIGNAL

EC-639

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Revision: 2006 July

2007 Murano

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 ECM's transistor. Use a ground other than ECM terminals, such as the ground.

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

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

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: 2,500 rpm

0.1 - 0.6V

SEC986C

SEC987C

EC-640

IGNITION SIGNAL

Revision: 2006 July

2007 Murano

TBWB0819E

IGNITION SIGNAL

EC-641

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EC

Revision: 2006 July

2007 Murano

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 ECM's transistor. Use a ground other than ECM terminals, such as the ground.

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

Diagnostic Procedure

NBS003DI

1. 

CHECK ENGINE START

Turn ignition switch OFF and restart engine.
Is engine running?

Yes or No

Yes (With CONSULT-II)>>GO TO 2.
Yes (Without CONSULT-II)>>GO TO 3.
No

>> GO TO 4.

2. 

CHECK OVERALL FUNCTION

 With CONSULT-II

1.

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

2.

Make sure that each circuit produces a momentary engine
speed drop.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 10.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

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: 2,500 rpm

0.1 - 0.6V

SEC986C

SEC987C

PBIB0133E

EC-642

IGNITION SIGNAL

Revision: 2006 July

2007 Murano

3. 

CHECK OVERALL FUNCTION

 Without CONSULT-II

1.

Let engine idle.

2.

Read the voltage signal between ECM terminals 60, 61, 62, 79,
80, 81 and ground with an oscilloscope.

3.

Verify that the oscilloscope screen shows the signal wave as
shown below.

NOTE:
The pulse cycle changes depending on rpm at idle.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 10.

4. 

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF, wait at least 10 seconds and then turn ON.

2.

Check voltage between ECM terminals 119, 120 and ground
with CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> Go to 

EC-142, "POWER SUPPLY AND GROUND CIR-

CUIT"

 .

PBIB1186E

SEC986C

Voltage: Battery voltage

MBIB0034E

IGNITION SIGNAL

EC-643

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Revision: 2006 July

2007 Murano

5. 

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect condenser harness connector.

3.

Turn ignition switch ON.

4.

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

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 6.

6. 

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector E7.

3.

Check harness continuity between IPDM E/R terminal 17 and condenser terminal 1.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 17.

NG

>> GO TO 7.

7. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E19, F3

●

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

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

PBIB1371E

Voltage: Battery voltage

PBIB0624E

Continuity should exist.

EC-644

IGNITION SIGNAL

Revision: 2006 July

2007 Murano

8. 

CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

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

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 9.

NG

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

9. 

CHECK CONDENSER

Refer to 

EC-646, "Component Inspection"

 .

OK or NG

OK

>> GO TO 10.

NG

>> Replace condenser.

10. 

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV

1.

Turn ignition switch OFF.

2.

Reconnect all harness connectors disconnected.

3.

Disconnect ignition coil harness connector.

4.

Turn ignition switch ON.

5.

Check voltage between ignition coil terminal 3 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 11.

11. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors F32, F221

●

Harness for open or short between ignition coil and harness connector F3

>> Repair or replace harness or connectors.

Continuity should exist.

Voltage: Battery voltage

PBIB1370E

PBIB0138E