Infiniti FX35, FX50 (S51). Manual - part 848

P0455 EVAP CONTROL SYSTEM

EC-933

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

C

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EC

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Refer to 

EC-850, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Replace “fuel level sensor unit and fuel pump (main)”.

15.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-917, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 16.

NO

>> Replace EVAP control system pressure sensor.

16.

CHECK EVAP/ORVR LINE

Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kinks, looseness and improper
connection. For location, refer to 

EC-1121, "Description"

.

Is the inspection result normal?

YES

>> GO TO 17.

NO

>> Repair or replace hoses and tubes.

17.

CHECK RECIRCULATION LINE

Check recirculation line between filler neck tube and fuel tank for clogging, kinks, cracks, looseness and
improper connection.

Is the inspection result normal?

YES

>> GO TO 18.

NO

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

18.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-1124, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 19.

NO

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

19.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005237398

1.

CHECK FUEL FILLER CAP

1.

Turn ignition switch OFF.

2.

Remove fuel filler cap.

3.

Wipe clean valve housing.

SEF445Y

EC-934

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P0455 EVAP CONTROL SYSTEM

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
illuminate.

>> INSPECTION END

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

P0456 EVAP CONTROL SYSTEM

EC-935

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

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P0456 EVAP CONTROL SYSTEM

DTC Logic

INFOID:0000000005237399

DTC DETECTION LOGIC

NOTE:
If DTC P0456 is displayed with DTC P0442, first perform the trouble diagnosis for DTC P0456. Refer to

EC-935, "DTC Logic"

.

This diagnosis detects very small leaks in the EVAP line between fuel tank and EVAP canister purge volume
control solenoid valve, using the intake manifold vacuum in the same way as conventional EVAP small leak
diagnosis.
If ECM judges a leak which corresponds to a very small leak, the very small leak P0456 will be detected.
If ECM judges a leak equivalent to a small leak, EVAP small leak P0442 will be detected.
If ECM judges that there are no leaks, the diagnosis will be OK.

CAUTION:

PBIB1026E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0456

Evaporative emission 
control system very 
small leak (negative 
pressure check)

• EVAP system has a very small 

leak.

• EVAP system does not operate 

properly.

• Incorrect fuel tank vacuum relief valve
• Incorrect fuel filler cap used
• Fuel filler cap remains open or does not close.
• Foreign matter caught in fuel filler cap.
• Leak is in line between intake manifold and EVAP canis-

ter purge volume control solenoid valve.

• Foreign matter caught in EVAP canister vent control 

valve.

• EVAP canister or fuel tank leaks
• EVAP purge line (pipe and rubber tube) leaks
• EVAP purge line rubber tube bent
• Loose or disconnected rubber tube
• EVAP canister vent control valve and the circuit
• EVAP canister purge volume control solenoid valve and 

the circuit

• Fuel tank temperature sensor
• O-ring of EVAP canister vent control valve is missing or 

damaged

• EVAP canister is saturated with water
• EVAP control system pressure sensor
• Refueling EVAP vapor cut valve
• ORVR system leaks
• Fuel level sensor and the circuit
• Foreign matter caught in EVAP canister purge volume 

control solenoid valve

EC-936

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P0456 EVAP CONTROL SYSTEM

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

MIL may illuminate.

• If the fuel filler cap is not tightened properly, the MIL may illuminate.
• Use only a genuine NISSAN rubber tube as a replacement.

DTC CONFIRMATION PROCEDURE

1.

INSPECTION START

Will CONSULT-III be used?

Will CONSULT-III be used?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting 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.

NOTE:
After repair, check that the hoses and clips are installed properly.
TESTING CONDITION:
• Open engine hood before conducting the following procedure.
• If any of following conditions are met just before the DTC confirmation procedure, leave the vehicle

for more than 1 hour.

- Fuel filler cap is removed.
- Fuel is refilled or drained.
- EVAP component part/parts is/are removed.
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Check that EVAP hoses are connected to EVAP canister purge volume control solenoid valve prop-

erly.

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE

 With CONSULT-III

1.

Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.

2.

Check that the following conditions are met.
FUEL LEVEL SE: 0.25 - 1.4 V
COOLAN TEMP/S: 0 - 32

°

C (32 - 90

°

F)

FUEL T/TMP SE: 0 - 35

°

C (32 - 95

°

F)

INT A/TEMP SE: More than 0

°

C (32

°

F)

If NG, turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle), or refill/drain fuel
until the output voltage of the “FUEL LEVEL SE” meets within the range above and leave the vehicle for
more than 1 hour. Then start from step 1.

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Turn ignition switch ON.

5.

Select “EVP V/S LEAK P0456/P1456” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode
with CONSULT-III.
Follow the instructions displayed.
NOTE:
If the engine speed cannot be maintained within the range displayed on CONSULT-III screen, go to

EC-576, "BASIC INSPECTION : Special Repair Requirement"

.

Which is displayed on CONSULT-III screen?

OK

>> INSPECTION END

NG

>> Go to 

EC-937, "Diagnosis Procedure"

.

4.

PERFORM COMPONENT FUNCTION CHECK

 With GST

Perform Component Function Check. Refer to 

EC-937, "Component Function Check"

.