Infiniti FX35 / FX45. Manual - part 554

DTC P0455 EVAP CONTROL SYSTEM

EC-977

< SERVICE INFORMATION >

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4.

Using EVAP leak detector, locate the EVAP leak. For the leak
detector, refer to the instruction manual for more details. Refer
to 

EC-618, "Description"

.

OK or NG

OK

>> GO TO 12.

NG

>> Repair or replace.

11.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

 With CONSULT-III

1.

Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

2.

Start engine.

3.

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

4.

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

5.

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

OK or NG

OK

>> GO TO 14.

NG

>> GO TO 13.

12.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

 Without CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Stop engine.

3.

Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

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.

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 13.

13.

CHECK VACUUM HOSE

Check vacuum hoses for clogging or disconnection. Refer to 

EC-684, "Vacuum Hose Drawing"

.

OK or NG

OK (With CONSULT-III)>>GO TO 14.
OK (Without CONSULT-III)>>GO TO 15.
NG

>> Repair or reconnect the hose.

14.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

 With CONSULT-III

1.

Start engine.

2.

Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-III. Check that engine speed var-
ies according to the valve opening.

OK or NG

OK

>> GO TO 16.

NG

>> GO TO 15.

15.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-945, "Component Inspection"

.

OK or NG

SEF200U

Vacuum should exist.

Vacuum should exist.

EC-978

< SERVICE INFORMATION >

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DTC P0455 EVAP CONTROL SYSTEM

OK

>> GO TO 16.

NG

>> Replace EVAP canister purge volume control solenoid valve.

16.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-884, "Component Inspection"

.

OK or NG

OK

>> GO TO 17.

NG

>> Replace fuel level sensor unit.

17.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-965, "Component Inspection"

.

OK or NG

OK

>> GO TO 18.

NG

>> Replace EVAP control system pressure sensor.

18.

CHECK EVAP/ORVR LINE

Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper con-
nection. For location, refer to 

EC-624

.

OK or NG

OK

>> GO TO 19.

NG

>> Repair or replace hoses and tubes.

19.

CHECK RECIRCULATION LINE

Check recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and
improper connection.

OK or NG

OK

>> GO TO 20.

NG

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

20.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-626, "Component Inspection"

.

OK or NG

OK

>> GO TO 21.

NG

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

21.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-717

.

>> INSPECTION END

DTC P0456 EVAP CONTROL SYSTEM

EC-979

< SERVICE INFORMATION >

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DTC P0456 EVAP CONTROL SYSTEM

On Board Diagnosis Logic

INFOID:0000000001326819

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.
• Use only a genuine NISSAN rubber tube as a replacement.

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-980

< SERVICE INFORMATION >

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DTC P0456 EVAP CONTROL SYSTEM

DTC Confirmation Procedure

INFOID:0000000001326820

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 vehicle

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-III

1.

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

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-III.
Follow the instruction displayed.

6.

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

EC-981, "Diagnosis Procedure"

.

NOTE:
• If the engine speed cannot be maintained within the range displayed on CONSULT-III screen, go

to 

EC-658, "Basic Inspection"

.

• Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid

valve properly.

Overall Function Check

INFOID:0000000001326821

 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).
• EVAP canister purge volume control solenoid valve (1)

PBIB3238E