Nissan Frontier. Manual - part 437

 

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Nissan Frontier. Manual - part 437

 

 

P0456 EVAP CONTROL SYSTEM

EC-319

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DTC Confirmation Procedure

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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 the 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.

Refilled or drained the fuel.

EVAP component part/parts is/are removed.

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

 WITH CONSULT

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

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 refill/drain fuel

until the output voltage 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 “EVP V/S LEAK P0456/P1456” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode

with CONSULT.

Follow the instructions displayed.

6. Make sure that “OK” is displayed.

If “NG” is displayed, refer to 

EC-320, "Diagnosis Procedure"

.

NOTE:

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

EC-117, "Basic Inspection"

.

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

valve properly.

Overall Function Check

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 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.

• Never start engine.
• Never exceeded 4.12 kPa (0.042 kg/cm

2

, 0.6 psi).

1. Attach the EVAP service port adapter (commercial service tool)

securely to the EVAP service port.

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EC-320

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P0456 EVAP CONTROL SYSTEM

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 (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).

If NG, go to 

EC-320, "Diagnosis 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.

Diagnosis Procedure

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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-316, "Component Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>> Replace fuel filler cap with a genuine one.

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P0456 EVAP CONTROL SYSTEM

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5.

INSTALL THE PRESSURE PUMP

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

sure pump to EVAP service port securely. For the location of EVAP

service port.

NOTE:

Improper installation of the EVAP service port adapter to the

EVAP service port may cause leaking.

With CONSULT>>GO TO 6.

Without CONSULT>>GO TO 7.

6.

CHECK FOR EVAP LEAK

With CONSULT

1. Turn ignition switch ON.

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

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

the bar graph.

CAUTION:

• Never use compressed air or a high pressure pump.
• Never exceed 4.12 kPa (0.042 kg/cm

2

, 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-469, "How to Detect Fuel Vapor Leakage"

.

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace.

7.

CHECK FOR EVAP LEAK

Without CONSULT

1. Turn ignition switch OFF.

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P0456 EVAP CONTROL SYSTEM

2. Apply 12 volts DC to EVAP canister vent control valve (1). The

valve will close. (Continue to apply 12 volts until the end of test.)

- EVAP control system pressure sensor (2)

- Drain filter (3)

- EVAP canister (4)

: Vehicle front

3. Pressurize the EVAP line using pressure pump with 1.3 to 2.7

kPa (0.013 to 0.028 kg/cm

2

, 0.19 to 0.39 psi), then remove

pump and EVAP service port adapter.

CAUTION:

• Never use compressed air or a high pressure pump.
• Never exceed 4.12 kPa (0.042 kg/cm

2

, 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-469, "How to Detect Fuel Vapor Leakage"

.

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace.

8.

CHECK EVAP CANISTER VENT CONTROL VALVE

Check the following.

• EVAP canister vent control valve is installed properly.

Refer to 

FL-14, "Removal and Installation"

• EVAP canister vent control valve.

Refer to 

EC-453, "Component Inspection"

OK or NG

OK

>> GO TO 9.

NG

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

9.

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.

2. Does water drain from the EVAP canister?
Yes or No

Yes

>> GO TO 10.

No (With CONSULT)>>GO TO 12.

No (Without CONSULT)>>GO TO 13.

10.

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 2.0 kg (4.4 lb).
OK or NG

OK (With CONSULT)>>GO TO 12.

OK (Without CONSULT)>>GO TO 13.

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