Nissan Murano Z51 (2008 year). Manual - part 157

EC-328

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0460 FUEL LEVEL SENSOR

>> INSPECTION END

Revision: 2008 October

2009 Murano

P0461 FUEL LEVEL SENSOR

EC-329

< COMPONENT DIAGNOSIS >

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P0461 FUEL LEVEL SENSOR

Description

INFOID:0000000003591659

The fuel level sensor is mounted in the fuel level sensor unit.
The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combina-
tion meter sends the fuel level sensor signal to the ECM via the CAN communication line.
It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output volt-
age changes depending on the movement of the fuel mechanical float.

DTC Logic

INFOID:0000000003388094

DTC DETECTION LOGIC

NOTE:
• If DTC P0461 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P0461 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-346, "DTC Logic"

.

Driving long distances naturally affect fuel gauge level.
This diagnosis detects the fuel gauge malfunction of the gauge not moving even after a long distance has
been driven.

DTC CONFIRMATION PROCEDURE

1.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-329, "Component Function Check"

.

Use component function check to check the overall function of the fuel level sensor. During this check, a 1st
trip DTC might not be confirmed.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-330, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000003388095

1.

PRECONDITIONING

WARNING:

When performing the following procedure, always observe the handling of the fuel. Refer to 

FL-12,

"Removal and Installation"

.

TESTING CONDITION:
Before starting component function check, preparation of draining fuel and refilling fuel is required.

Will CONSULT-III be used?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

PERFORM COMPONENT FUNCTION CHECK

With CONSULT-III

NOTE:
Start from step 10, if it is possible to confirm that the fuel cannot be drained by 30   (7-7/8 US gal, 6-5/
8 Imp gal) in advance.
1.

Prepare a fuel container and a spare hose.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0461

Fuel level sensor circuit 
range/performance

The output signal of the fuel level sensor does 
not change within the specified range even 
though the vehicle has been driven a long dis-
tance.

• Harness or connectors

(The CAN communication line is open or 
shorted)

• Harness or connectors

(The sensor circuit is open or shorted)

• Combination meter
• Fuel level sensor

Revision: 2008 October

2009 Murano

EC-330

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0461 FUEL LEVEL SENSOR

2.

Release fuel pressure from fuel line, refer to 

EC-547, "Inspection"

.

3.

Remove the fuel feed hose on the fuel level sensor unit.

4.

Connect a spare fuel hose where the fuel feed hose was removed.

5.

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

6.

Select “FUEL LEVEL SE” in “DATA MONITOR” mode with CONSULT-III.

7.

Check “FUEL LEVEL SE” output voltage and note it.

8.

Select “FUEL PUMP RELAY” in “ACTIVE TEST” mode with CONSULT-III.

9.

Touch “ON” and drain fuel approximately 30   (7-7/8 US gal, 6-5/8 Imp gal) and stop it.

10. Check “FUEL LEVEL SE” output voltage and note it.
11. Fill fuel into the fuel tank for 30   (7-7/8 US gal, 6-5/8 Imp gal).
12. Check “FUEL LEVEL SE” output voltage and note it.
13. Confirm whether the voltage changes more than 0.03 V during step 7 to 10 and 10 to 12.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-330, "Diagnosis Procedure"

.

3.

PERFORM COMPONENT FUNCTION CHECK

Without CONSULT-III

NOTE:
Start from step 8, if it is possible to confirm that the fuel cannot be drained by 30   (7-7/8 US gal, 6-5/8
Imp gal) in advance.
1.

Prepare a fuel container and a spare hose.

2.

Release fuel pressure from fuel line. Refer to 

EC-547, "Inspection"

.

3.

Remove the fuel feed hose on the fuel level sensor unit.

4.

Connect a spare fuel hose where the fuel feed hose was removed.

5.

Turn ignition switch ON.

6.

Drain fuel by 30   (7-7/8 US gal, 6-5/8 Imp gal) from the fuel tank using proper equipment.

7.

Confirm that the fuel gauge indication varies.

8.

Fill fuel into the fuel tank for 30   (7-7/8 US gal, 6-5/8 Imp gal).

9.

Confirm that the fuel gauge indication varies.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-330, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003591660

1.

CHECK COMBINATION METER FUNCTION

Refer to 

MWI-34, "CONSULT-III Function (METER/M&A)"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

MWI-46, "Diagnosis Procedure"

.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Revision: 2008 October

2009 Murano

P0462, P0463 FUEL LEVEL SENSOR

EC-331

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P0462, P0463 FUEL LEVEL SENSOR

Description

INFOID:0000000003591661

The fuel level sensor is mounted in the fuel level sensor unit.
The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combina-
tion meter sends the fuel level sensor signal to the ECM via the CAN communication line.
It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output volt-
age changes depending on the movement of the fuel mechanical float.

DTC Logic

INFOID:0000000003388098

DTC DETECTION LOGIC

NOTE:
• If DTC P0462 or P0463 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC

UXXXX.

• If DTC P0462 or P0463 is displayed with DTC P0607, first perform the trouble diagnosis for DTC

P0607.Refer to 

EC-346, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at ignition
switch ON.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 5 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-331, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003591662

1.

CHECK COMBINATION METER FUNCTION

Refer to 

MWI-34, "CONSULT-III Function (METER/M&A)"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

MWI-46, "Diagnosis Procedure"

.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0462

Fuel level sensor circuit 
low input

An excessively low voltage from the sensor is 
sent to ECM.

• Harness or connectors

(The CAN communication line is open or 
shorted)

• Harness or connectors

(The sensor circuit is open or shorted)

• Combination meter
• Fuel level sensor

P0463

Fuel level sensor circuit 
high input

An excessively high voltage from the sensor is 
sent to ECM.

Revision: 2008 October

2009 Murano

EC-332

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0462, P0463 FUEL LEVEL SENSOR

>> INSPECTION END

Revision: 2008 October

2009 Murano

P0500 VSS

EC-333

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P0500 VSS

Description

INFOID:0000000003388100

The vehicle speed signal is sent to the combination meter from the “ABS actuator and electric unit (control
unit)” via the CAN communication line. The combination meter then sends a signal to the ECM via the CAN
communication line.

DTC Logic

INFOID:0000000003388101

DTC DETECTION LOGIC

NOTE:
• If DTC P0500 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P0500 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-346, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

INSPECTION START

Will CONSULT-III be used?

Will CONSULT-III be used?

YES

>> GO TO 2.

NO

>> GO TO 5.

2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 3.

3.

CHECK VEHICLE SPEED SIGNAL

NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.

With CONSULT-III

1.

Start engine (VDC switch OFF).

2.

Read “VHCL SPEED SE” in “DATA MONITOR” mode with CONSULT-III. The vehicle speed on CON-
SULT-III should exceed 10 km/h (6 MPH) when rotating wheels with suitable gear position.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Go to 

EC-334, "Diagnosis Procedure"

.

4.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Select “DATA MONITOR” mode with CONSULT-III.

2.

Warm engine up to normal operating temperature.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0500

Vehicle speed sensor

The vehicle speed signal sent to ECM is 
almost 0 km/h (0 MPH) even when vehicle 
is being driven.

• Harness or connectors

(The CAN communication line is open or short-
ed)

• Harness or connectors

(The vehicle speed signal circuit is open or 
shorted)

• Wheel sensor
• Combination meter
• ABS actuator and electric unit (control unit)

Revision: 2008 October

2009 Murano

EC-334

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0500 VSS

3.

Maintain the following conditions for at least 50 consecutive seconds.

CAUTION:

Always drive vehicle at a safe speed.

4.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-334, "Diagnosis Procedure"

.

NO

>> INSPECTION END

5.

PERFORM COMPONENT FUNCTION CHECK

Perform Component Function Check. Refer to 

EC-334, "Component Function Check"

.

Use Component Function Check to check the overall function of the vehicle speed signal circuit. During this
check, a 1st trip DTC might not be confirmed.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-334, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000003388102

1.

PERFORM COMPONENT FUNCTION CHECK

With GST

1.

Lift up drive wheels.

2.

Start engine.

3.

Read vehicle speed signal in Service $01 with GST.
The vehicle speed signal on GST should be able to exceed 10 km/h (6 MPH) when rotating wheels with
suitable gear position.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-334, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003388103

1.

CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”

Refer to 

BRC-29, "CONSULT-III Function"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning part.

2.

CHECK COMBINATION METER FUNCTION

Refer to 

MWI-34, "CONSULT-III Function (METER/M&A)"

.

>> INSPECTION END

ENG SPEED

1,400 - 6,000 rpm

COOLAN TEMP/S

More than 70

°

C (158

°

F)

B/FUEL SCHDL

5.5 - 31.8 msec

Selector lever

Except P or N position

PW/ST SIGNAL

OFF

Revision: 2008 October

2009 Murano

P0506 ISC SYSTEM

EC-335

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P0506 ISC SYSTEM

Description

INFOID:0000000003388104

The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects
the actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration and engine load (air conditioner, power steering and cooling fan
operation, etc.). 

DTC Logic

INFOID:0000000003388105

DTC DETECTION LOGIC

NOTE:
If DTC P0506 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

If the target idle speed is out of the specified value, perform 

EC-17, "IDLE AIR VOLUME LEARNING :

Special Repair Requirement"

, before conducting DTC CONFIRMATION PROCEDURE.

TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Always perform the test at a temperature above 

−

10

°

C(14

°

F).

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON.

4.

Turn ignition switch OFF and wait at least 10 seconds.

5.

Restart engine and run it for at least 1 minute at idle speed.

6.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-335, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003388106

1.

CHECK INTAKE AIR LEAKAGE

1.

Start engine and let it idle.

2.

Listen for an intake air leakage after the mass air flow sensor.

Is intake air leakage detected?

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0506

Idle speed control sys-
tem RPM lower than ex-
pected

The idle speed is less than the target idle speed 
by 100 rpm or more.

• Electric throttle control actuator
• Intake air leakage

Revision: 2008 October

2009 Murano

EC-336

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0506 ISC SYSTEM

YES

>> Discover air leakage location and repair.

NO

>> GO TO 2.

2.

REPLACE ECM

1.

Stop engine.

2.

Replace ECM.

3.

Go to 

EC-15, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-

ment"

.

>> INSPECTION END

Revision: 2008 October

2009 Murano

P0507 ISC SYSTEM

EC-337

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P0507 ISC SYSTEM

Description

INFOID:0000000003591663

The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects
the actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration and engine load (air conditioner, power steering and cooling fan
operation, etc.). 

DTC Logic

INFOID:0000000003388108

DTC DETECTION LOGIC

NOTE:
If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

If the target idle speed is out of the specified value, perform 

EC-17, "IDLE AIR VOLUME LEARNING :

Special Repair Requirement"

, before conducting DTC Confirmation Procedure.

TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Always perform the test at a temperature above 

−

10

°

C(14

°

F).

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON.

4.

Turn ignition switch OFF and wait at least 10 seconds.

5.

Restart engine and run it for at least 1 minute at idle speed.

6.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-337, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003388109

1.

CHECK PCV HOSE CONNECTION

Confirm that PCV hose is connected correctly.

Is the inspection result normal?

YES

>> GO TO 2.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0507

Idle speed control sys-
tem RPM higher than 
expected

The idle speed is more than the target idle 
speed by 200 rpm or more.

• Electric throttle control actuator
• Intake air leakage
• PCV system

Revision: 2008 October

2009 Murano

EC-338

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0507 ISC SYSTEM

NO

>> Repair or replace malfunctioning part.

2.

CHECK INTAKE AIR LEAKAGE

1.

Start engine and let it idle.

2.

Listen for an intake air leakage after the mass air flow sensor.

Is intake air leakage detected?

YES

>> Discover air leakage location and repair.

NO

>> GO TO 3.

3.

REPLACE ECM

1.

Stop engine.

2.

Replace ECM.

3.

Go to 

EC-15, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-

ment"

.

>> INSPECTION END

Revision: 2008 October

2009 Murano

P0550 PSP SENSOR

EC-339

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P0550 PSP SENSOR

Description

INFOID:0000000003388110

Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a
power steering load.
This sensor is a potentiometer which transforms the power steering load into output voltage, and emits the
voltage signal to the ECM. The ECM controls the electric throttle control actuator and adjusts the throttle valve
opening angle to increase the engine speed and adjusts the idle speed for the increased load.

DTC Logic

INFOID:0000000003388111

DTC DETECTION LOGIC

NOTE:
If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-347, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for at least 5 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-339, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003388112

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection E38. Refer to Ground Inspection in 

GI-43, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK PSP SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect power steering pressure (PSP) sensor harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between PSP sensor harness connector and ground.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0550

Power steering pressure 
sensor circuit

An excessively low or high voltage from the 
sensor is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted)

• Power steering pressure sensor

PSP sensor

Ground

Voltage

Connector

Terminal

F62

3

Ground

Approx. 5 V

Revision: 2008 October

2009 Murano

EC-340

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0550 PSP SENSOR

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

3.

CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between PSP sensor harness connector and ECM harness connector.

4.

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

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

4.

CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between PSP sensor harness connector and ECM harness connector.

2.

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

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

5.

CHECK PSP SENSOR

Refer to 

EC-340, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace PSP sensor.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000003388113

1.

CHECK POWER STEERING PRESSURE SENSOR

1.

Reconnect all harness connectors disconnected.

2.

Start engine and let it idle.

3.

Check the voltage between ECM terminals under the following conditions.

Is the inspection result normal?

PSP sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F62

1

F8

48

Existed

PSP sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F62

2

F8

41

Existed

ECM

Condition

Voltage

Connector

+

–

Terminal

Terminal

F8

41

(Power steering pressure 

sensor signal)

48

(Sensor ground)

Steering wheel: Being turned.

0.5 - 4.5 V

Steering wheel: Not being turned.

0.4 - 0.8 V

Revision: 2008 October

2009 Murano

P0550 PSP SENSOR

EC-341

< COMPONENT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

YES

>> INSPECTION END

NO

>> Replace power steering pressure sensor.

Revision: 2008 October

2009 Murano

EC-342

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0603 ECM POWER SUPPLY

P0603 ECM POWER SUPPLY

Description

INFOID:0000000003388114

Battery voltage is supplied to the ECM even when the ignition switch
is turned OFF for the ECM memory function of the DTC memory, the
air-fuel ratio feedback compensation value memory, the idle air vol-
ume learning value memory, etc.

DTC Logic

INFOID:0000000003388115

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 1 second.

2.

Start engine and let it idle for 1 second.

3.

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

4.

Repeat steps 2 and 3 for 4 times.

5.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-342, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003388116

1.

CHECK ECM POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the voltage between ECM harness connector terminals.

PBIA9222J

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0603

ECM power supply cir-
cuit

ECM back up RAM system does not function 
properly.

• Harness or connectors

[ECM power supply (back up) circuit is 
open or shorted.]

• ECM

Revision: 2008 October

2009 Murano

P0603 ECM POWER SUPPLY

EC-343

< COMPONENT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• 15 A fuse (No. 50)
• IPDM E/R harness connector F12
• Harness for open or short between ECM and battery

>> Repair or replace harness or connectors.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness or connectors.

4.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Erase DTC.

3.

Perform DTC CONFIRMATION PROCEDURE.
See 

EC-342, "DTC Logic"

.

Is the 1st trip DTC P0603 displayed again?

YES

>> GO TO 5.

NO

>> INSPECTION END

5.

REPLACE ECM

1.

Replace ECM.

2.

Go to 

EC-15, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-

ment"

.

>> INSPECTION END

ECM

Voltage

+

–

Connector

Terminal

Connector

Terminal

F8

77

E16

112

Battery voltage

Revision: 2008 October

2009 Murano