Nissan Frontier D22. Manual - part 611

DTC P0456 EVAP CONTROL SYSTEM

EC-1547

[VG33ER]

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EC

DTC P0456 EVAP CONTROL SYSTEM

PFP:14950

On Board Diagnosis Logic

UBS00DYE

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 there are no leaks, the diagnosis will be OK.

PBIB1438E

EC-1548

[VG33ER]

DTC P0456 EVAP CONTROL SYSTEM

CAUTION:

●

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

●

If the fuel filler cap is not tightened properly, the MIL may come on.

●

Use only a genuine NISSAN rubber tube as a replacement.

DTC Confirmation Procedure

UBS00DYF

CAUTION:

Never remove fuel filler cap during the DTC confirmation procedure. 

NOTE:

●

If DTC P0456 or P1456 is displayed with P0442, first perform trouble diagnosis for DTC P0456 or
P1456.

●

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

●

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 5 seconds before conducting the next test.

TESTING CONDITION:

●

Open engine hood before conducting following procedure.

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If any of following condition is met just before the DTC confirmation procedure, leave the vehicle
for more than 1 hour.

–

Fuel filler cap is removed.

–

Refilled or drained the fuel.

–

EVAP component parts is/are removed.

●

Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0456

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

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EVAP system has a very small leak.

●

EVAP system does not operate prop-
erly.

●

Incorrect fuel tank vacuum relief valve

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Incorrect fuel filler cap used

●

Fuel filler cap remains open or fails to close.

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Foreign matter caught in fuel filler cap.

●

Leak is in line between intake manifold and EVAP 
canister purge volume control solenoid valve.

●

Foreign matter caught in EVAP canister vent con-
trol valve.

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EVAP canister or fuel tank leaks

●

EVAP purge line (pipe and rubber tube) leaks

●

EVAP purge line rubber tube bent

●

Blocked or bent rubber tube to EVAP control sys-
tem pressure sensor

●

Loose or disconnected rubber tube

●

EVAP canister vent control valve and the circuit

●

EVAP canister purge volume control solenoid 
valve and the circuit

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Fuel tank temperature sensor

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O-ring of EVAP canister vent control valve is miss-
ing or damaged

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Water separator

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EVAP canister is saturated with water

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EVAP control system pressure sensor

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Refueling control valve

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ORVR system leaks

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Fuel level sensor and the circuit

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Foreign matter caught in EVAP canister purge vol-
ume control solenoid valve

DTC P0456 EVAP CONTROL SYSTEM

EC-1549

[VG33ER]

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EC

 WITH CONSULT-II

1.

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

2.

Make sure the following conditions are met.
FUEL LEVEL SE: 1.08 - 0.2V
COOLAN TEMP/S: 0 - 35

°C (32 - 95°F)

FUEL T/TMP SE: 0 - 32

°C (32 - 90°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 refilling/draining fuel until the output
voltage condition 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 5 seconds.

4.

Turn ignition switch ON.

5.

Select “EVAP V/S LEAK P0456/P1456” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode
with CONSULT-II.
Follow the instruction displayed.

6.

Make sure that “OK” is displayed.
If “NG” is displayed, refer to 

EC-1550, "Diagnostic Procedure"

 .

NOTE:

●

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

EC-1247, "Basic Inspection"

 .

●

Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid valve
properly.

Overall Function Check

UBS00DYG

 WITH GST

Use this procedure to check the overall function of the EVAP very small leak function. During this check, a
DTC might not be confirmed.

CAUTION:

●

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

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Do not start engine.

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Do not exceeded 4.12 kPa (0.042 kg/cm

2

 , 0.6 psi).

1.

Attach the EVAP service port adapter securely to the EVAP ser-
vice port.

2.

Set the pressure pump and a hose.

3.

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

4.

Turn ignition switch ON.

5.

Connect GST and select MODE 8.

6.

Using MODE 8 control the EVAP canister vent control valve
(close) and vacuum cut valve bypass valve (open).

7.

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

PBIB1953E

PBIB0837E

SEF462UA

EC-1550

[VG33ER]

DTC P0456 EVAP CONTROL SYSTEM

Pressure to be applied: 2.7 kPa (20 mmHg, 0.79 inHg)
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 (3 mmHg, 0.12 inHg)
If NG, go to 

EC-1550, "Diagnostic Procedure"

 .

NOTE:
For more information, refer to GST instruction manual.

Diagnostic Procedure

UBS00DYH

1. 

CHECK FUEL FILLER CAP DESIGN

1.

Turn ignition switch OFF.

2.

Check for genuine NISSAN fuel filler cap design.

OK or NG

OK

>> GO TO 2.

NG

>> 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.

OK or NG

OK

>> GO TO 3.

NG

>>

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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.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

CHECK FUEL TANK VACUUM RELIEF VALVE

Refer to 

EC-1743, "Component Inspection"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Replace fuel filler cap with a genuine one.

SEF915U