Nissan Maxima. Manual - part 506

EC-508

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

Description

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From the beginning of refueling, the air and vapor inside the fuel tank go via the refueling EVAP vapor cut

valve and EVAP/ORVR line to the EVAP canister. 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.

WARNING:

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

• Put a “CAUTION: FLAMMABLE” sign in workshop.

• Never smoke while servicing fuel system. Keep open flames and sparks away from work area.

• Always 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-592, "Inspection"

.

- Disconnect battery ground cable.

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

• Never kink or twist hose and tube when they are installed.

• Never tighten hose and clamps excessively to avoid damaging hoses.

• After installation, run engine and check for fuel leakage at connections.

• Never 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.

Component Function Check

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1.

CHECK ORVR FUNCTION

Check whether the following symptoms are present.

• Fuel odor from EVAP canister is strong.

• Cannot refuel/Fuel odor from the fuel filler opening is strong while refueling.
Are any symptoms present?

YES

>> Go to 

EC-508, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

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1.

INSPECTION START

Check whether the following symptoms are present.

A: Fuel odor from EVAP canister is strong.

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ON BOARD REFUELING VAPOR RECOVERY (ORVR)

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B: Cannot refuel/Fuel odor from the fuel filler opening is strong while refueling.
A or B

A

>> GO TO 2.

B

>> GO TO 8.

2.

CHECK EVAP CANISTER

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

attached. Refer to 

FL-14, "Removal and Installation (EVAP Canister)"

.

2. Weigh the EVAP canister with 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

>> GO TO 3.

NO

>> GO TO 4.

3.

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

Check if water will drain from EVAP canister
Does water drain from the EVAP canister?

YES

>> GO TO 4.

NO

>> GO TO 7.

4.

REPLACE EVAP CANISTER

Replace EVAP canister with a new one.

>> GO TO 5.

5.

CHECK DRAIN FILTER

Refer to 

EC-511, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace drain filter.

6.

DETECT MALFUNCTIONING PART

Check the EVAP hose between EVAP canister and drain filter for clogging or poor connection.

>> Repair or replace EVAP hose. Refer to 

FL-14, "Removal and Installation (EVAP Canister)"

.

7.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-511, "Component Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

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

8.

CHECK EVAP CANISTER

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

attached. Refer to 

FL-14, "Removal and Installation (EVAP Canister)"

.

2. Weigh the EVAP canister with 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?

PBIB1213E

EC-510

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

YES

>> GO TO 9.

NO

>> GO TO 10.

9.

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

Check if water will drain from EVAP canister.
Does water drain from the EVAP canister?

YES

>> GO TO 10.

NO

>> GO TO 12.

10.

REPLACE EVAP CANISTER

Replace EVAP canister with a new one.

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the EVAP hose between EVAP canister and drain filter for clogging or poor connection.

>> Repair or replace EVAP hose. Refer to 

FL-14, "Removal and Installation (EVAP Canister)"

.

12.

CHECK VENT HOSES AND VENT TUBES

Check hoses and tubes between EVAP canister and refueling control valve for clogging, kinks, looseness and

improper connection.
Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair or replace hoses and tubes.

13.

CHECK FILLER NECK TUBE

Check recirculation line for clogging, dents and cracks. 
Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Replace filler neck tube.

14.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-511, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 15.

NO

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

15.

CHECK FUEL FILLER TUBE

Check filler neck tube and hose connected to the fuel tank for clogging, dents and cracks.
Is the inspection result normal?

YES

>> GO TO 16.

NO

>> Replace fuel filler tube.

16.

CHECK ONE-WAY FUEL VALVE-I

Check one-way valve for clogging.
Is the inspection result normal?

YES

>> GO TO 17.

NO

>> Repair or replace one-way fuel valve with fuel tank. Refer to 

FL-10, "Removal and Installation"

.

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ON BOARD REFUELING VAPOR RECOVERY (ORVR)

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17.

CHECK ONE-WAY FUEL VALVE-II

1. Check that fuel is drained from the tank.

2. Remove fuel filler tube and hose. Refer to 

EM-43, "Exploded View"

.

3. Check one-way fuel valve for operation as per the following.

When a stick is inserted, the valve should open, when removing

stick it should close.

Do not drop any material into the tank.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace fuel filler tube or replace one-way fuel valve

with fuel tank.

Component Inspection

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REFUELING EVAP VAPOR CUT VALVE

1.

INSPECTION START

Will CONSULT be used?
Will CONSULT be used?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK REFUELING EVAP VAPOR CUT VALVE

With CONSULT

1. Turn ignition switch OFF.

2. Remove fuel tank. Refer to 

FL-10, "Removal and Installation"

.

3. Drain fuel from the tank as per the following:

-

Remove fuel feed hose located on the fuel gauge retainer.

-

Connect a spare fuel hose, one side to fuel gauge 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.

4. Check refueling EVAP vapor cut valve for being stuck to close as per the following.

Blow air into the refueling EVAP vapor cut valve (from the end of EVAP/ORVR line hose), and check that

the air flows freely into the tank.

5. Check refueling EVAP vapor cut valve for being stuck to open as per the following.

-

Connect vacuum pump to hose end.

-

Remove fuel gauge retainer with fuel gauge unit.

Always replace O-ring with new one.

-

Turn fuel tank upside down.

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