Infiniti FX35, FX50 (S51). Manual - part 849

P0456 EVAP CONTROL SYSTEM

EC-937

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-937, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000005237400

1.

PERFORM COMPONENT FUNCTION CHECK

 With GST

CAUTION:

• Never use compressed air, doing so may damage the EVAP system.
• Never start engine.
• Never exceed 4.12 kPa (0.042 kg/cm

2

, 0.6 psi).

1.

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

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 check the following conditions are satisfied.
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-937, "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:0000000005237401

1.

CHECK FUEL FILLER CAP DESIGN

1.

Turn ignition switch OFF.

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EC-938

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P0456 EVAP CONTROL SYSTEM

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-941, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace fuel filler cap with a genuine one.

5.

CHECK FOR EVAP LEAK

Refer to 

EC-1237, "Inspection"

.

Is there any leak in EVAP line?

YES

>> Repair or replace malfunctioning part.

NO

>> GO TO 6.

6.

CHECK EVAP CANISTER VENT CONTROL VALVE

Check the following.
• EVAP canister vent control valve is installed properly.

Refer to 

EC-1239, "Removal and Installation"

.

• EVAP canister vent control valve

Refer to 

EC-909, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

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

7.

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

1.

Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.

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P0456 EVAP CONTROL SYSTEM

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2.

Check if water will drain from EVAP canister (1).

-

EVAP canister vent control valve (2)

Does water drain from the EVAP canister?

YES

>> GO TO 8.

NO-1

>> With CONSULT-III: GO TO 10.

NO-2

>> Without CONSULT-III: GO TO 11.

8.

CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.1 kg (4.6 lb).

Is the inspection result normal?

YES-1 >> With CONSULT-III: GO TO 10.
YES-2 >> Without CONSULT-III: GO TO 11.
NO

>> GO TO 9.

9.

DETECT MALFUNCTIONING PART

Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

>> Repair hose or replace EVAP canister.

10.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

 With CONSULT-III

1.

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

2.

Start engine and let it idle.

3.

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

4.

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

5.

Check vacuum hose for vacuum.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> GO TO 12.

11.

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 from 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.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> GO TO 12.

12.

CHECK VACUUM HOSE

Check vacuum hoses for clogging or disconnection. Refer to 

EC-653, "System Description"

.

Is the inspection result normal?

PBIB2731E

Vacuum should exist.

Vacuum should exist.

EC-940

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P0456 EVAP CONTROL SYSTEM

YES

>> GO TO 13.

NO

>> Repair or reconnect the hose.

13.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-903, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Replace EVAP canister purge volume control solenoid valve.

14.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-850, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Replace “fuel level sensor unit and fuel pump (main)”.

15.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-917, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 16.

NO

>> Replace EVAP control system pressure sensor.

16.

CHECK EVAP PURGE LINE

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection.
Refer to 

EC-653, "System Description"

.

Is the inspection result normal?

YES

>> GO TO 17.

NO

>> Repair or reconnect the hose.

17.

CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.

>> GO TO 18.

18.

CHECK EVAP/ORVR LINE

Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kinks, looseness and improper
connection. For location, refer to 

EC-1121, "Description"

.

Is the inspection result normal?

YES

>> GO TO 19.

NO

>> Repair or replace hoses and tubes.

19.

CHECK RECIRCULATION LINE

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

Is the inspection result normal?

YES

>> GO TO 20.

NO

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

20.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-1124, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 21.

NO

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

21.

CHECK FUEL LEVEL SENSOR

Refer to 

MWI-62, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 22.