Nissan Maxima. Manual - part 471

EC-368

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P0456 EVAP CONTROL SYSTEM

Remove EVAP canister with EVAP canister vent control valve and

EVAP control system pressure sensor attached. Refer to 

FL-17,

"Removal and Installation"

.

Does water drain from the EVAP canister?

YES

>> GO TO 9.

NO-1 >> With CONSULT: GO TO 11.

NO-2 >> Without CONSULT: GO TO 12.

9.

CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor

attached.

The weight should be less than 2.1 kg (4.6 lb).
Is the inspection result normal?

YES-1 >> With CONSULT: GO TO 11.

YES-2 >> Without CONSULT: GO TO 12.

NO

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

Check the following.

• EVAP canister for damage

• EVAP hose between EVAP canister and drain filter for clogging or poor connection

>> Repair hose or replace EVAP canister. Refer to 

FL-14, "Removal and Installation (EVAP Canis-

ter)"

.

11.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

With CONSULT

1. Disconnect vacuum hose connected to EVAP service port and EVAP canister purge volume control sole-

noid valve from EVAP canister purge volume control solenoid valve.

2. Start engine.

3. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode.

4. Touch “Qu” on CONSULT screen to increase “PURG VOL CONT/V” opening to 100%.

5. Check vacuum hose for vacuum.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> GO TO 13.

12.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

Without CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Stop engine.

3. Disconnect vacuum hose connected to EVAP service port and EVAP canister purge volume control sole-

noid valve from EVAP canister purge volume control solenoid valve.

4. Start engine and let it idle for at least 80 seconds.

5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> GO TO 13.

13.

CHECK VACUUM HOSE

PBIB1213E

Vacuum should exist.

Vacuum should exist.

P0456 EVAP CONTROL SYSTEM

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Check vacuum hoses for clogging or disconnection. Refer to 

EC-94, "System Diagram"

.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Repair or reconnect the hose.

14.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-327, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Replace EVAP canister purge volume control solenoid valve.

15.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-272, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 16.

NO

>> Replace fuel level sensor unit. Refer to 

FL-6, "Removal and Installation"

.

16.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-346, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 17.

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-17, "Removal and Installation"

.

17.

CHECK EVAP PURGE LINE

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

Refer to 

EC-94, "System Diagram"

.

Is the inspection result normal?

YES

>> GO TO 18.

NO

>> Repair or reconnect the hose.

18.

CLEAN EVAP PURGE LINE

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

>> GO TO 19.

19.

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-508, "Description"

.

Is the inspection result normal?

YES

>> GO TO 20.

NO

>> Repair or replace hoses and tubes.

20.

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 21.

NO

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

21.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-511, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 22.

NO

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

FL-10, "Exploded View"

. 

22.

CHECK FUEL LEVEL SENSOR

Refer to 

MWI-41, "Component Inspection"

.

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P0456 EVAP CONTROL SYSTEM

Is the inspection result normal?

YES

>> GO TO 23.

NO

>> Replace fuel level sensor unit. Refer to 

FL-6, "Removal and Installation"

.

23.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000010095042

FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FILLER CAP)

1.

CHECK FUEL FILLER CAP

1. Turn ignition switch OFF.

2. Remove fuel filler cap. Refer to 

FL-10, "Exploded View"

.

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. Refer to 

FL-10, "Exploded View"

.

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

DRAIN FILTER

1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.

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

P0456 EVAP CONTROL SYSTEM

EC-371

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4. Blow air into port A and check that it flows freely out of port B.
5. Block port B.
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter.

PBIB3641E