Nissan Frontier. Manual - part 593

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

EC-943

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

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NG

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

FL-6, "Removal and Installation"

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11.

CHECK ONE-WAY FUEL VALVE-II

1. Make sure that fuel is drained from the tank.

2. Remove fuel filler tube and hose.

3. Check one-way fuel valve for operation as follows.

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

stick it should close.

Do not drop any material into the tank.

OK or NG

OK

>> INSPECTION END

NG

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

with fuel tank. Refer to 

FL-6, "Removal and Installation"

.

Component Inspection

INFOID:0000000009481648

REFUELING EVAP VAPOR CUT VALVE

 With CONSULT

1. Remove fuel tank. Refer to 

FL-6, "Removal and Installation"

.

2. Drain fuel from the tank as follows:
a. Remove fuel feed hose located on the fuel gauge retainer.
b. Connect a spare fuel hose, one side to fuel gauge retainer where the hose was removed and the other

side to a fuel container.

c. Drain fuel using “FUEL PUMP RELAY” in “ACTIVE TEST” mode with CONSULT.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows.

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.

4. Check refueling EVAP vapor cut valve for being stuck to open as follows.
a. Connect vacuum pump to hose end.
b. Remove fuel gauge retainer with fuel gauge unit.

Always replace O-ring with new one.

c. Turn fuel tank upside down.
d. Apply vacuum pressure to hose end [

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

remaining open and check that the pressure is applicable.

 Without CONSULT

SEF665U

BBIA0568E

EC-944

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

1. Remove fuel tank. Refer to 

FL-6, "Removal and Installation"

.

2. Drain fuel from the tank as follows:
a. Remove fuel gauge retainer.
b. Drain fuel from the tank using a handy pump into a fuel container.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows.

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.

4. Check refueling EVAP vapor cut valve for being stuck to open as follows.
a. Connect vacuum pump to hose end.
b. Remove fuel gauge retainer with fuel gauge unit.

Always replace O-ring with new one.

c.

Turn fuel tank upside down.

d. Apply vacuum pressure to hose end [

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

remaining open and check that the pressure is applicable.

DRAIN FILTER

1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Blow air into port A and check that it flows freely out of port B.
5. Block port B.
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter.

BBIA0568E

PBIB3641E

POSITIVE CRANKCASE VENTILATION

EC-945

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

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POSITIVE CRANKCASE VENTILATION

Description

INFOID:0000000009481649

SYSTEM DESCRIPTION

This system returns blow-by gas to the intake manifold.

The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake

manifold. During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the

PCV valve. Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of venti-

lating air. The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air

passes through the hose connecting air inlet tubes to rocker cover. Under full-throttle condition, the manifold

vacuum is insufficient to draw the blow-by flow through the valve. The flow goes through the hose connection

in the reverse direction.

On vehicles with an excessively high blow-by, the valve does not

meet the requirement. This is because some of the flow will go

through the hoseconnection to the air inlet tubes under all condi-

tions.

Component Inspection

INFOID:0000000009481650

PCV (POSITIVE CRANKCASE VENTILATION) VALVE

With engine running at idle, remove PCV valve from rocker cover. A

properly working valve makes a hissing noise as air passes through

it. A strong vacuum should be felt immediately when a finger is

placed over valve inlet.

SEC921C

PBIB1588E

PBIB1589E

EC-946

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

POSITIVE CRANKCASE VENTILATION

PCV VALVE VENTILATION HOSE

1. Check hoses and hose connections for leaks.
2. Disconnect all hoses and clean with compressed air. If any

hosecannot be freed of obstructions, replace.

S-ET277