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Infiniti QX56 (JA60). Manual - part 401

EC-256

< COMPONENT DIAGNOSIS >

[VK56DE]

P0455 EVAP CONTROL SYSTEM

2. Check for genuine NISSAN fuel filler cap design.
OK or NG

>> GO TO 2.

>> Replace with genuine NISSAN fuel filler cap.

CHECK FUEL FILLER CAP INSTALLATION

Check that the cap is tightened properly by rotating the cap clockwise.
OK or NG

>> GO TO 3.

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

2. Retighten until ratcheting sound is heard.

CHECK FUEL FILLER CAP FUNCTION

Check for air releasing sound while opening the fuel filler cap.
OK or NG

>> GO TO 5.

>> GO TO 4.

CHECK FUEL TANK VACUUM RELIEF VALVE

Refer to

EC-268, "Component Inspection"

OK or NG

>> GO TO 5.

>> Replace fuel filler cap with a genuine one.

CHECK EVAP PURGE LINE

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

disconnection.

Refer to

EC-37, "Description"

OK or NG

>> GO TO 6.

>> Repair or reconnect the hose.

CLEAN EVAP PURGE LINE

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

>> GO TO 7.

CHECK EVAP CANISTER VENT CONTROL VALVE

Check the following.

• EVAP canister vent control valve is installed properly.

Refer to

EC-493, "Removal and Installation"

• EVAP canister vent control valve.

Refer to

EC-236, "Component Inspection"

OK or NG

>> GO TO 8.

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

INSTALL THE PRESSURE PUMP

SEF915U

P0455 EVAP CONTROL SYSTEM

EC-257

< COMPONENT DIAGNOSIS >

[VK56DE]

To locate the EVAP leak, install EVAP service port adapter and pres-

sure pump to EVAP service port securely.

NOTE:

Improper installation of the EVAP service port adapter to the

EVAP service port may cause leaking.

With CONSULT-III>>GO TO 9.

Without CONSULT-III>>GO TO 10.

CHECK FOR EVAP LEAK

With CONSULT-III

1. Turn ignition switch ON.

2. Select “EVAP SYSTEM CLOSE” of “WORK SUPPORT” mode with CONSULT-III.

3. Touch “START” and apply pressure into the EVAP line until the pressure indicator reaches the middle of

the bar graph.

CAUTION:

• Do not use compressed air or a high pressure pump.
• Do not exceed 4.12 kPa (0.042 kg/cm

, 0.6 psi) of pressure in the system.

4. Using EVAP leak detector, locate the EVAP leak. For the leak

detector, refer to the instruction manual for more details.

Refer to

EC-37, "Description"

OK or NG

>> GO TO 11.

>> Repair or replace.

10.

CHECK FOR EVAP LEAK

Without CONSULT-III

1. Turn ignition switch OFF.

BBIA0366E

SEF916U

SEF200U

EC-258

< COMPONENT DIAGNOSIS >

[VK56DE]

P0455 EVAP CONTROL SYSTEM

2. Apply 12 volts DC to EVAP canister vent control valve. The valve will close. (Continue to apply 12 volts

until the end of test.)

3. Pressurize the EVAP line using pressure pump with 1.3 to 2.7 kPa (10 to 20 mmHg, 0.39 to 0.79 inHg),

then remove pump and EVAP service port adapter.

CAUTION:

• Do not use compressed air or a high pressure pump.
• Do not exceed 4.12 kPa (0.042 kg/cm

, 0.6 psi) of pressure in the system.

4. Using EVAP leak detector, locate the EVAP leak. For the leak

detector, refer to the instruction manual for more details. Refer

EC-37, "Description"

OK or NG

>> GO TO 12.

>> 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

>> GO TO 14.

>> 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

>> GO TO 15.

>> GO TO 13.

13.

CHECK VACUUM HOSE

Check vacuum hoses for clogging or disconnection. Refer to

EC-37, "Description"

OK or NG

BBIA0443E

SEF200U

Vacuum should exist.

P0455 EVAP CONTROL SYSTEM

EC-259

< COMPONENT DIAGNOSIS >

[VK56DE]

OK (With CONSULT-III)>>GO TO 14.

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

>> 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

>> GO TO 16.

>> GO TO 15.

15.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to

EC-233, "Component Inspection"

OK or NG

>> GO TO 16.

>> Replace EVAP canister purge volume control solenoid valve.

16.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to

EC-184, "Component Inspection"

OK or NG

>> GO TO 17.

>> Replace fuel level sensor unit.

17.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to

EC-243, "Component Inspection"

OK or NG

>> GO TO 18.

>> 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-412

OK or NG

>> GO TO 19.

>> 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

>> GO TO 20.

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

20.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to

EC-414, "Component Inspection"

OK or NG

>> GO TO 21.

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

21.

CHECK INTERMITTENT INCIDENT

Refer to

GI-35, "How to Check Terminal"

and

GI-38, "Intermittent Incident"

>> INSPECTION END

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