Nissan Frontier D22. Manual - part 661

EVAPORATIVE EMISSION SYSTEM

EC-1747

[VG33ER]

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3.

Apply battery voltage to between the terminals of both EVAP
canister vent control valve and vacuum cut valve bypass valve
to make a closed EVAP system.

4.

To locate the leak, deliver positive pressure to the EVAP system
until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to
0.028 kg/cm

2

 , 0.2 to 0.4 psi).

5.

Remove EVAP service port adapter and hose with pressure
pump.

6.

Locate the leak using a leak detector. Refer to 

EC-1741, "EVAP-

ORATIVE EMISSION LINE DRAWING"

 .

AEC632A

EC-1748

[VG33ER]

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

PFP:00032

System Description

UBS00E3A

From the beginning of refueling, the fuel tank pressure goes up. When the pressure reaches the setting value
of the refueling control valve (RCV) opening pressure, the RCV is opened. After RCV opens, the air and vapor
inside the fuel tank go through refueling EVAP vapor cut valve, RCV and refueling vapor line to the EVAP can-
ister. The vapor is absorbed by the EVAP canister and the air is released to the atmosphere.
When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and
refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged
during driving.
The RCV is always closed during driving and the evaporative emission control system is operated the same
as conventional system.

WARNING:

When conducting inspections below, be sure to observe the following:

●

Put a “CAUTION: INFLAMMABLE” sign in workshop.

●

Do not smoke while servicing fuel system. Keep open flames and sparks away from work area.

●

Be sure to furnish the workshop with a CO

2

  fire extinguisher.

CAUTION:

●

Before removing fuel line parts, carry out the following procedures:

–

Put drained fuel in an explosion-proof container and put lid on securely.

–

Release fuel pressure from fuel line. Refer to 

EC-1218, "FUEL PRESSURE RELEASE"

 .

–

Disconnect battery ground cable.

●

Always replace O-ring when the fuel gauge retainer is removed.

●

Do not kink or twist hose and tube when they are installed.

●

Do not tighten hose and clamps excessively to avoid damaging hoses.

●

After installation, run engine and check for fuel leaks at connection.

●

Do not attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically.
Continued refueling may cause fuel overflow, resulting in fuel spray and possibly a fire.

SEF206VA

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

EC-1749

[VG33ER]

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Diagnostic Procedure

UBS00E3B

SYMPTOM: FUEL ODOR FROM EVAP CANISTER IS STRONG.

1. 

CHECK EVAP CANISTER

1.

Remove EVAP canister with EVAP canister vent control valve attached.

2.

Weigh the EVAP canister with EVAP canister vent control valve attached.
The weight should be less than 1.8 kg (4.0 lb).

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2. 

CHECK IF EVAP CANISTER SATURATED WITH WATER

●

Does water drain from the EVAP canister?

Yes or No

Yes

>> GO TO 3.

No (With CONSULT-II)>>GO TO 6.
No (Without CONSULT-II)>>GO TO 7.

3. 

REPLACE EVAP CANISTER

Replace EVAP canister with a new one.

>> GO TO 4.

4. 

CHECK WATER SEPARATOR

1.

Check visually for insect nests in the water separator air inlet.

2.

Check visually for cracks or flaws in the appearance.

3.

Check visually for cracks or flaws in the hose.

4.

Check that A  and C  are not clogged by blowing air into B  with
A , and then C  plugged.

5.

In case of NG in items 2 - 4, replace the parts.

NOTE:

●

Do not disassemble water separator.

OK or NG

OK

>> GO TO 5.

NG

>> Replace water separator.

5. 

DETECT MALFUNCTIONING PART

Check the EVAP hose between EVAP canister and water separator for clogging or poor connection.

>> Repair or replace EVAP hose.

SEF596U

PBIB1032E

EC-1750

[VG33ER]

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

6. 

CHECK REFUELING EVAP VAPOR CUT VALVE

 With CONSULT-II

1.

Remove fuel tank. Refer to 

FL-3, "FUEL TANK"

 .

2.

Drain fuel from the tank as follows:

–

Remove fuel feed hose located on the fuel level sensor unit retainer.

–

Connect a spare fuel hose, one side to fuel level sensor unit retainer where the hose was removed and
the other side to a fuel container.

–

Drain fuel using “FUEL PUMP RELAY” in “ACTIVE TEST” mode with CONSULT-II.

3.

Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve (from hose end B), and check that the air flows freely into
the tank.

4.

Check EVAP vapor cut valve for being stuck to open as follows.

–

Connect vacuum pump to hose ends A and B using a suitable 3-way connector.

–

Remove fuel level sensor unit retainer with fuel level sensor unit.
Always replace O-ring with new one.

–

Put fuel tank upside down.

–

Apply vacuum pressure to both hose ends A and B [

−13.3 kPa (−100 mmHg, −3.94 inHg)] with fuel level

sensor unit retainer remaining open and check that the pressure is applicable.

OK or NG

OK

>> GO TO 8.

NG

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

SEF707Z