Nissan Pathfinder (2012 year). Manual - part 357

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

EC-937

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ON BOARD REFUELING VAPOR RECOVERY (ORVR)

System Description

INFOID:0000000007358854

From the beginning of refueling, the air and vapor inside the fuel tank go through 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, always 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 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-952, "Fuel Pressure Check"

.

- 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 connection.

• 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.

Diagnosis Procedure

INFOID:0000000007358855

SYMPTOM: FUEL ODOR FROM EVAP CANISTER IS STRONG.

1.

CHECK EVAP CANISTER

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

attached. Refer to 

FL-16, "Removal and Installation"

.

2. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor

attached.

The weight should be less than 2.0 kg (4.4 lb)

.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2.

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

JMBIA1930GB

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2012 Pathfinder

EC-938

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ON BOARD REFUELING VAPOR RECOVERY (ORVR)

Does water drain from the EVAP canister?
Yes or No

Yes

>> GO TO 3.

No

>> GO TO 6.

3.

REPLACE EVAP CANISTER

Replace EVAP canister with a new one. Refer to 

FL-16, "Removal and Installation"

.

>> GO TO 4.

4.

CHECK DRAIN FILTER

Refer to 

EC-940, "Component Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>> Replace drain filter.

5.

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 

EM-165

.

6.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-940, "Component Inspection"

.

OK or NG

OK

>>

INSPECTION END

NG

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

FL-16, "Removal and Installation"

.

SYMPTOM: CANNOT REFUEL/FUEL ODOR FROM THE FUEL FILLER OPENING IS STRONG
WHILE REFUELING.

1.

CHECK EVAP CANISTER

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

attached. Refer to 

FL-16, "Removal and Installation"

.

2. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor

attached.

The weight should be less than 2.0 kg (4.4 lb)

.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2.

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

BBIA0558E

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ON BOARD REFUELING VAPOR RECOVERY (ORVR)

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Does water drain from the EVAP canister?
Yes or No

Yes

>> GO TO 3.

No

>> GO TO 6.

3.

REPLACE EVAP CANISTER

Replace EVAP canister with a new one. Refer to 

FL-16, "Removal and Installation"

.

>> GO TO 4.

4.

CHECK DRAIN FILTER

Refer to 

EC-940, "Component Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>> Replace drain filter. Refer to 

EC-516

.

5.

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 

EM-165

.

6.

CHECK VENT HOSES AND VENT TUBES

Check hoses and tubes between EVAP canister and refueling EVAP vapor cut valve for clogging, kinks, loose-

ness and improper connection.
OK or NG

OK

>> GO TO 7.

NG

>> Repair or replace hoses and tubes.

7.

CHECK FILLER RECIRCULATION LINE

Check recirculation line for clogging, dents and cracks. 
OK or NG

OK

>> GO TO 8.

NG

>> Replace filler filler tube.

8.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-940, "Component Inspection"

.

OK or NG

OK

>> GO TO 9.

NG

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

FL-16, "Removal and Installation"

.

9.

CHECK FUEL FILLER TUBE

Check filler filler tube and hose connected to the fuel tank for clogging, dents and cracks.
OK or NG

OK

>> GO TO 10.

NG

>> Replace fuel filler tube.

10.

CHECK ONE-WAY FUEL VALVE-I

Check one-way valve for clogging.
OK or NG

OK

>> GO TO 11.

BBIA0558E

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EC-940

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ON BOARD REFUELING VAPOR RECOVERY (ORVR)

NG

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

FL-6, "Removal and Installation"

.

11.

CHECK ONE-WAY FUEL VALVE-II

1. Check that fuel is drained from the tank.

2. Remove fuel filler tube and hose.

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.

Never 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

.

Component Inspection

INFOID:0000000007358856

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 per the following:
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 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.

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

−

0.136 kg/cm

2

, 

−

.93 psi)] with fuel gauge retainer

remaining open and check that the pressure is applicable.

 Without CONSULT

SEF665U

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ON BOARD REFUELING VAPOR RECOVERY (ORVR)

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1. Remove fuel tank. Refer to 

FL-6, "Removal and Installation"

.

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

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

−

0.136 kg/cm

2

, 

−

.93 psi)] 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. Refer to 

EC-516

.

BBIA0568E

PBIB3641E

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EC-942

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POSITIVE CRANKCASE VENTILATION

POSITIVE CRANKCASE VENTILATION

Description

INFOID:0000000007358857

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 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 hose connection to the air inlet tubes under all condi-

tions.

Component Inspection

INFOID:0000000007358858

PCV (POSITIVE CRANKCASE VENTILATION) VALVE

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

Refer to 

EM-178

. 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.

PCV VALVE VENTILATION HOSE

PBIB0062E

PBIB1588E

PBIB1589E

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POSITIVE CRANKCASE VENTILATION

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

cannot be freed of obstructions, replace.

S-ET277

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EC-944

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REFRIGERANT PRESSURE SENSOR

REFRIGERANT PRESSURE SENSOR

Component Description

INFOID:0000000007358859

The refrigerant pressure sensor (1) is installed at the condenser of

the air conditioner system. The sensor uses an electrostatic volume

pressure transducer to convert refrigerant pressure to voltage. The

voltage signal is sent to ECM, and ECM controls cooling fan system.

Diagnosis Procedure

INFOID:0000000007358860

1.

CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION

1. Start engine and warm it up to normal operating temperature.

2. Turn A/C switch and blower fan switch ON.

3. Check voltage between ECM terminal 70 and ground with CON-

SULT or tester.

OK or NG

OK

>>

INSPECTION END

NG

>> GO TO 2.

2.

CHECK GROUND CONNECTIONS

1. Turn A/C switch and blower fan switch OFF.

2. Turn ignition switch OFF.

3. Loosen and retighten ground screws on the body.

ALBIA0357ZZ

PBIB2657E

Voltage: 1.0 - 4.0 V

PBIB1188E

August 2012

2012 Pathfinder