Infiniti M35/M45 Y50. Manual - part 495

 

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Infiniti M35/M45 Y50. Manual - part 495

 

 

DTC P0456 EVAP CONTROL SYSTEM

EC-453

[VQ35DE]

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EC

DTC P0456 EVAP CONTROL SYSTEM

PFP:14950

On Board Diagnosis Logic

NBS00515

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.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0456
0456

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

●

EVAP system has a very small leak.

●

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.

●

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.

●

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 miss-
ing 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 vol-
ume control solenoid valve

PBIB1026E

EC-454

[VQ35DE]

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

NBS00516

NOTE:

●

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

●

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 10 seconds before conducting the next test.

TESTING CONDITION:

●

Open engine hood before conducting following procedure.

●

If any of following conditions are met just before the DTC confirmation procedure, leave the vehi-
cle for more than 1 hour.

–

Fuel filler cap is removed.

–

Fuel is refilled or drained.

–

EVAP component parts is/are removed.

●

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

 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: 0.25 - 1.4V
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 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 10 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-456, "Diagnostic Procedure"

 .

NOTE:

●

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

EC-78, "Basic Inspection"

 .

PBIB2644E

PBIB0837E

DTC P0456 EVAP CONTROL SYSTEM

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EC

●

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

Overall Function Check

NBS00517

 WITH GST

Use this procedure to check the overall function of the EVAP very small leak function. During this check, a 1st
trip DTC might not be confirmed.

CAUTION:

●

Do not use compressed air, doing so may damage the EVAP system.

●

Do not start engine.

●

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 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 (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-456, "Diagnostic Procedure"

 .

If OK, go to next step.

8.

Disconnect GST.

9.

Start engine and warm it up to normal operating temperature.

10. Turn ignition switch OFF and wait at least 10 seconds.
11. Restart engine and let it idle for 90 seconds.

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

13. Turn ignition switch OFF.

NOTE:
For more information, refer to GST Instruction Manual.

PBIB2006E

SEF462UI

EC-456

[VQ35DE]

DTC P0456 EVAP CONTROL SYSTEM

Diagnostic Procedure

NBS00518

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

>> 1. Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.

2. 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-42, "FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FULLER CAP)"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Replace fuel filler cap with a genuine one.

SEF915U

 

 

 

 

 

 

 

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