Infiniti M45 (Y34). Manual - part 422

DTC P0455 EVAP CONTROL SYSTEM

EC-377

18.

CHECK REFUELING EVAP VAPOR LINE

Check refueling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness and
improper connection. For location, refer to

EC-698, "ON BOARD REFUELING VAPOR RECOVERY (ORVR)"

.
OK or NG

>> GO TO 19.

>> Repair or replace hoses and tubes.

19.

CHECK SIGNAL LINE AND RECIRCULATION LINE

Check signal line and recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, loose-
ness and improper connection.
OK or NG

>> GO TO 20.

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

20.

CHECK REFUELING CONTROL VALVE

Refer to

EC-701, "Component Inspection"

OK or NG

>> GO TO 21.

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

21.

CHECK INTERMITTENT INCIDENT

Refer to

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

>> INSPECTION END

EC-378

DTC P0456 EVAP CONTROL SYSTEM

PFP:14950

On Board Diagnosis Logic

ABS002L5

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.

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.

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

●

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

●

Fuel tank temperature sensor

●

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

●

Water separator

●

EVAP canister is saturated with water

●

EVAP control system pressure sensor

●

Refueling control valve

●

ORVR system leaks

●

Fuel level sensor and the circuit

●

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

SEF323U

DTC P0456 EVAP CONTROL SYSTEM

EC-379

●

Use only a genuine NISSAN rubber tube as a replacement.

DTC Confirmation Procedure

ABS002L6

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.

–

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.

WITH CONSULT-II

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

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

C (32 - 90

FUEL T/TMP SE: 0 - 35

C (32 - 95

INT/A TEMP SE: More than 0

C (32

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).

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

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

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

EC-381, "Diagnostic Procedure"

NOTE:

●

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

EC-81, "Basic Inspection"

●

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

PBIB2644E

PBIB0837E

EC-380

DTC P0456 EVAP CONTROL SYSTEM

Overall Function Check

ABS002L7

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:

●

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

●

Do not start engine.

●

Do not exceeded 4.12 kPa (0.042 kg/cm

, 0.6 psi).

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

Set the pressure pump and a hose.

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

Turn ignition switch ON.

Connect GST and select MODE 8.

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

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-381, "Diagnostic Procedure"

If OK, go to next step.

Disconnect GST.

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.

PBIB1114E

SEF462UI

Content .. 420 421 422 423 ..