Nissan Maxima. Manual - part 470

EC-364

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0456 EVAP CONTROL SYSTEM

P0456 EVAP CONTROL SYSTEM

DTC Logic

INFOID:0000000010095039

DTC DETECTION LOGIC

NOTE:

If DTC P0456 is displayed with DTC P0442, first perform the trouble diagnosis for DTC P0456.

This diagnosis detects very small leakage in the EVAP line between fuel tank and EVAP canister purge vol-

ume control solenoid valve, using the intake manifold vacuum in the same way as conventional EVAP small

leakage diagnosis.

If ECM judges a leakage which corresponds to a very small leakage, the very small leakage P0456 will be

detected.

If ECM judges a leakage equivalent to a small leakage, EVAP small leakage P0442 will be detected.

If ECM judges that there are no leakage, the diagnosis will be OK.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0456

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

• EVAP system has a very small leak-

age.

• EVAP system does not operate prop-

erly.

• Incorrect fuel tank vacuum relief valve
• Incorrect fuel filler cap used
• Fuel filler cap remains open or fails to close.
• Foreign matter caught in fuel filler cap.
• Leakage is in line between intake manifold and 

EVAP canister purge volume control solenoid 
valve.

• Foreign matter caught in EVAP canister vent con-

trol valve.

• EVAP canister or fuel tank leakage
• EVAP purge line (pipe and rubber tube) leakage
• 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
• Drain filter
• O-ring of EVAP canister vent control valve is miss-

ing or damaged

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

ume control solenoid valve

PBIB3640E

P0456 EVAP CONTROL SYSTEM

EC-365

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

CAUTION:

• 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.

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.
Will CONSULT be used?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

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.

NOTE:

• After repair, make sure that the hoses and clips are installed properly.

• Check that EVAP hoses are connected to EVAP canister purge volume control solenoid valve prop-

erly.

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.

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

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

2. Make sure 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 LEAKAGE P0456/P1456” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT”

mode with CONSULT.

Follow the instructions displayed.

NOTE:

If the engine speed cannot be maintained within the range displayed on CONSULT screen, go to

EC-14, "BASIC INSPECTION : Special Repair Requirement"

.

Which is displayed on CONSULT?

OK

>> INSPECTION END

NG

>> Go to 

EC-366, "Diagnosis Procedure"

.

4.

PERFORM COMPONENT FUNCTION CHECK

EC-366

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0456 EVAP CONTROL SYSTEM

Perform Component Function Check. Refer to 

EC-366, "Component Function Check"

.

NOTE:

Use Component Function Check to check the overall function of the EVAP very small leakage function. During

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

YES

>> INSPECTION END

NO

>> Go to 

EC-366, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000010095040

1.

PERFORM COMPONENT FUNCTION CHECK

With GST

CAUTION:

• Never use compressed air, doing so may damage the EVAP system.

• Never start engine.
• Never exceeded 4.12 kPa (0.042 kg/cm

2

, 0.6 psi).

1. Attach the EVAP service port adapter (commercial service tool) securely to the EVAP service port.

2. Set the pressure pump and a hose.

3. Also set a vacuum gauge via the 3-way connector and a hose.

4. Turn ignition switch ON.

5. Connect GST and select Service $08.

6. Using Service $08 control the EVAP canister vent control valve

(close).

7. Apply pressure and make sure the following conditions are sat-

isfied.
Pressure to be applied: 2.7 kPa (0.028 kg/cm

2

, 0.39 psi)

Time to be waited after the pressure drawn in to the EVAP

system and the pressure to be dropped: 60 seconds and

the pressure should not be dropped more than 0.4 kPa
(0.004 kg/cm

2

, 0.06 psi).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

EC-366, "Diagnosis Procedure"

.

2.

RELEASE PRESSURE

1. Disconnect GST.

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

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Restart engine and let it idle for 90 seconds.

5. Keep engine speed at 2,000 rpm for 30 seconds.

6. Turn ignition switch OFF.

NOTE:

For more information, refer to GST Instruction Manual.

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010095041

1.

CHECK FUEL FILLER CAP DESIGN

1. Turn ignition switch OFF.

SEF462UI

P0456 EVAP CONTROL SYSTEM

EC-367

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2. Check for genuine NISSAN fuel filler cap design.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace with genuine NISSAN fuel filler cap.

2.

CHECK FUEL FILLER CAP INSTALLATION

Check that the cap is tightened properly by rotating the cap clockwise.
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Open fuel filler cap, then clean cap and fuel filler neck threads using air blower. Retighten until

ratcheting sound is heard.

3.

CHECK FUEL FILLER CAP FUNCTION

Check for air releasing sound while opening the fuel filler cap.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK FUEL TANK VACUUM RELIEF VALVE

Refer to 

EC-370, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace fuel filler cap with a genuine one. Refer to 

FL-10, "Exploded View"

.

5.

CHECK FOR EVAP LEAKAGE

Refer to 

EC-594, "Inspection"

.

Is there any leakage in EVAP line?

YES

>> Repair or replace malfunctioning part.

NO

>> GO TO 6.

6.

CHECK DRAIN FILTER

Refer to 

EC-511, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace drain filter.

7.

CHECK EVAP CANISTER VENT CONTROL VALVE

Check the following.

• EVAP canister vent control valve is installed properly.

Refer to 

FL-16, "Removal and Installation"

.

• EVAP canister vent control valve.

Refer to 

EC-335, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace EVAP canister vent control valve and O-ring.

8.

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

SEF915U