Nissan Pathfinder (2012 year). Manual — part 357
ON BOARD REFUELING VAPOR RECOVERY (ORVR)
EC-937
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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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
- 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
August 2012
2012 Pathfinder
EC-938
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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
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
6.
CHECK REFUELING EVAP VAPOR CUT VALVE
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
August 2012
2012 Pathfinder
ON BOARD REFUELING VAPOR RECOVERY (ORVR)
EC-939
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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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
EC-940, "Component Inspection"
OK or NG
OK
>> GO TO 5.
NG
>> Replace drain filter. Refer to
.
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
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
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
August 2012
2012 Pathfinder
EC-940
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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
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
BBIA0568E
August 2012
2012 Pathfinder
ON BOARD REFUELING VAPOR RECOVERY (ORVR)
EC-941
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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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
BBIA0568E
PBIB3641E
August 2012
2012 Pathfinder
EC-942
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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.
. 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
August 2012
2012 Pathfinder
POSITIVE CRANKCASE VENTILATION
EC-943
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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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
August 2012
2012 Pathfinder
EC-944
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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
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