Nissan Altima L32. Manual - part 305

P0456 EVAP CONTROL SYSTEM

EC-341

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection.

Refer to 

EC-86, "System Diagram"

.

Is the inspection result normal?

YES

>> GO TO 17.

NO

>> Repair or reconnect the hose.

17.

CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.

>> GO TO 18.

18.

CHECK EVAP/ORVR LINE

Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper con-

nection. For location, refer to 

EC-476, "Description"

.

Is the inspection result normal?

YES

>> GO TO 19.

NO

>> Repair or replace hoses and tubes.

19.

CHECK RECIRCULATION LINE

Check recirculation line between fuel filler tube and fuel tank for clogging, kink, cracks, looseness and

improper connection.
Is the inspection result normal?

YES

>> GO TO 20.

NO

>> Repair or replace hose, tube or fuel filler tube.

20.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-479, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 21.

NO

>> Replace refueling EVAP vapor cut valve with fuel tank. 

21.

CHECK FUEL LEVEL SENSOR

Refer to 

MWI-47, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 22.

NO

>> Replace fuel level sensor unit.

22.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000004349367

1.

CHECK FUEL TANK VACUUM RELIEF VALVE

1. Turn ignition switch OFF.

2. Remove fuel filler cap.

EC-342

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0456 EVAP CONTROL SYSTEM

3. Wipe clean valve housing.

4. Install fuel filler cap adapter (commercial service tool) to fuel filler cap.

5. Check valve opening pressure and vacuum.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

REPLACE FUEL FILLER CAP

Replace fuel filler cap.

CAUTION:

Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may

come on.

>> INSPECTION END

SEF445Y

Pressure: 15.3 - 20.0 kPa (0.156 - 0.204 kg/cm

2

, 2.22 - 

2.90 psi)

Vacuum:

−6.0 to −3.3 kPa (−0.061 to −0.034 kg/cm

2

, 

−0.87 to −0.48 psi)

SEF943S

P0460 FUEL LEVEL SENSOR

EC-343

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0460 FUEL LEVEL SENSOR

Description

INFOID:0000000004349368

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 through 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:0000000004349369

DTC DETECTION LOGIC

NOTE:

• If DTC P0460 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.

• If DTC P0460 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-361, "DTC Logic"

.

When the vehicle is parked, naturally the fuel level in the fuel tank is stable. It means that output signal of the

fuel level sensor does not change. If ECM senses sloshing signal from the sensor, fuel level sensor malfunc-

tion is detected.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and wait maximum of 2 consecutive minutes.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-343, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004349370

1.

CHECK COMBINATION METER FUNCTION

Refer to 

MWI-46, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

EC-343, "Diagnosis Procedure"

.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0460

Fuel level sensor circuit 
noise

Even though the vehicle is parked, a signal be-
ing varied is sent from the fuel level sensor 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

EC-344

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0461 FUEL LEVEL SENSOR

P0461 FUEL LEVEL SENSOR

Description

INFOID:0000000004349371

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 through 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:0000000004349372

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-361, "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-344, "Component Function Check"

.

Use component function check to check the overall function of the fuel level sensor function. During this

check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-345, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000004349373

1.

PRECONDITIONING

WARNING:

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

FL-6,

"Removal and Installation"

.

TESTING CONDITION:

Before starting component function check, preparation of draining fuel and refilling fuel is required.
Do you have CONSULT-III?

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