Nissan Pathfinder (2012 year). Manual - part 272

P0448 EVAP CANISTER VENT CONTROL VALVE

EC-257

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

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P0448 EVAP CANISTER VENT CONTROL VALVE

Component Description

INFOID:0000000007358170

The EVAP canister vent control valve (3) is located on the EVAP

canister (4) and is used to seal the canister vent.

This solenoid valve responds to signals from the ECM. When the

ECM sends an ON signal, the coil in the solenoid valve is energized.

A plunger will then move to seal the canister vent. The ability to seal

the vent is necessary for the on board diagnosis of other evaporative

emission control system components.

This solenoid valve is used only for diagnosis, and usually remains

opened.

When the vent is closed, under normal purge conditions, the evapo-

rative emission control system is depressurized and allows EVAP

Control System diagnosis.

• Fuel filler pipe (top of frame view) (1)

• EVAP control system pressure sensor (2)

• Drain filter (5)
•

: Vehicle front

On Board Diagnosis Logic

INFOID:0000000007358171

DTC Confirmation Procedure

INFOID:0000000007358172

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next step.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

 WITH CONSULT

1. Turn ignition switch ON and wait at least 5 seconds.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
4. Start engine and let it idle for at least 1 minute. 
5. Repeat next procedures 3 times.

PBIB3642E

AWBIA0134ZZ

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0448
0448

EVAP canister vent con-
trol valve close

EVAP canister vent control valve remains 
closed under specified driving conditions.

• EVAP canister vent control valve
• EVAP control system pressure sensor 

and the circuit

• Blocked rubber tube to EVAP canister 

vent control valve

• Drain filter
• EVAP canister is saturated with water

August 2012

2012 Pathfinder

EC-258

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P0448 EVAP CANISTER VENT CONTROL VALVE

a. Increase the engine speed between 3,000 and 3,500 rpm and maintain that speed for 2 minutes and 50

seconds to 3 minutes.

Never exceed 3 minutes.

b. Fully released accelerator pedal and keep engine idle for about 5 seconds.
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to 

EC-258, "Diagnosis Procedure"

.

If 1st trip DTC is not detected, go to the next step.

8. Repeat next procedure 20 times.
a. Quickly increase the engine speed between 4,000 and 4,500 rpm or more and maintain that speed for 25

to 30 seconds.

b. Fully released accelerator pedal and keep engine idle for at least 35 seconds.

9. Check 1st trip DTC.
10. If 1st trip DTC is detected, go to 

EC-258, "Diagnosis Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT” above.

Diagnosis Procedure

INFOID:0000000007358173

1.

CHECK RUBBER TUBE

1. Turn ignition switch OFF.

2. Disconnect rubber tube connected to EVAP canister vent control

valve (3).

-

Fuel filler pipe (top of frame view) (1)

-

EVAP control system pressure sensor (2)

-

EVAP canister (4)

-

Drain filter (5)

-

: Vehicle front

3. Check the rubber tube for clogging.
OK or NG

OK

>> GO TO 2.

NG

>> Clean rubber tube using an air blower.

2.

CHECK DRAIN FILTER

Refer to 

EC-255, "Component Inspection"

.

OK or NG

OK

>> GO TO 3.

NG

>> Replace drain filter. Refer to 

EC-57, "Description"

.

3.

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-259, "Component Inspection"

.

OK or NG

OK

>> GO TO 4.

NG

>> Replace EVAP canister vent control valve. Refer to 

FL-16, "Removal and Installation"

.

4.

CHECK IF EVAP CANISTER SATURATED IS WITH WATER

JMBIA1516GB

AWBIA0134ZZ

August 2012

2012 Pathfinder

P0448 EVAP CANISTER VENT CONTROL VALVE

EC-259

< DTC/CIRCUIT DIAGNOSIS >

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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. Check if water will drain from the EVAP canister.
Yes or No

Yes

>> GO TO 5.

No

>> GO TO 7.

5.

CHECK EVAP CANISTER

Weigh the EVAP canister with the 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 7.

NG

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.

• EVAP canister for damage

• EVAP hose between EVAP canister and drain filter for clogging or poor connection

>> Repair hose or replace EVAP canister. Refer to 

FL-16, "Removal and Installation"

.

7.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1. Disconnect EVAP control system pressure sensor harness connector.

2. Check connectors for water.

OK or NG

OK

>> GO TO 8.

NG

>> Replace EVAP control system pressure sensor. Refer to 

FL-16, "Removal and Installation"

.

8.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-269, "Component Inspection"

.

OK or NG

OK

>> GO TO 9.

NG

>> Replace EVAP control system pressure sensor. Refer to 

FL-16, "Removal and Installation"

.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

Component Inspection

INFOID:0000000007358174

EVAP CANISTER VENT CONTROL VALVE

 With CONSULT

1. Remove EVAP canister vent control valve from EVAP canister. Refer to 

FL-16, "Removal and Installation"

.

BBIA0558E

Water should not exist.

August 2012

2012 Pathfinder

EC-260

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P0448 EVAP CANISTER VENT CONTROL VALVE

2. Check portionof 

B

 EVAP canister vent control valve for being

rusted.

If NG, replace EVAP canister vent control valve.

If OK, go to next step.

3. Reconnect harness connectors disconnected.
4. Turn ignition switch ON.

5. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
6. Check air passage continuity and operation delay time.

Check that new O-ring is installed properly.

Operation takes less than 1 second.

If NG, go to next step.

7. Clean the air passage (portion 

A

 to 

B

) of EVAP canister vent control valve using an air blower.

8. Perform step 6 again.
9. If NG, replace EVAP canister vent control valve. Refer to 

FL-16, "Removal and Installation"

.

 Without CONSULT

1. Remove EVAP canister vent control valve from EVAP canister. Refer to 

FL-16, "Removal and Installation"

.

2. Check portion 

B

 of EVAP canister vent control valve for being

rusted.

3. Check air passage continuity and operation delay time under the

following conditions.

Check that new O-ring is installed properly.

Operation takes less than 1 second.

If NG, go to next step.

4. Clean the air passage (portion 

A

 to 

B

) of EVAP canister vent control valve using an air blower.

5. Perform step 3 again.
6. If NG, replace EVAP canister vent control valve. Refer to 

FL-16, "Removal and Installation"

.

PBIB1033E

Condition VENT CONTROL/V

Air passage continuity

 between (A) and (B)

ON

No

OFF

Yes

PBIB1033E

Condition

Air passage continuity

 between (A) and (B)

12V direct current supply between
 terminals 1 and 2

No

OFF

Yes

PBIB1034E

August 2012

2012 Pathfinder

P0448 EVAP CANISTER VENT CONTROL VALVE

EC-261

< DTC/CIRCUIT DIAGNOSIS >

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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-57, "Description"

.

PBIB3641E

August 2012

2012 Pathfinder

EC-262

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

Component Description

INFOID:0000000007358175

The EVAP control system pressure sensor (2) detects pressure in

the purge line. The sensor output voltage to the ECM increases as

pressure increases.

• Fuel filler pipe (top of frame view) (1)

• EVAP canister vent control valve (3)

• EVAP canister (4)

• Drain filter (5)
•

: Vehicle front

On Board Diagnosis Logic

INFOID:0000000007358176

If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-312

.

DTC Confirmation Procedure

INFOID:0000000007358177

DTC CONFIRMATION PROCEDURE

NOTE:

Never remove fuel filler cap during DTC confirmation procedure.

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next test. 

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

With CONSULT>>GO TO 2.

Without CONSULT>>GO TO 5.

2.

PERFORM DTC CONFIRMATION PROCEDURE-1

With CONSULT

1. Start engine and let it idle for least 40 seconds.

NOTE:

Do not depress accelerator pedal even slightly.

AWBIA0134ZZ

PBIB3370E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0451
0451

EVAP control system 
pressure sensor perfor-
mance

ECM detects a sloshing signal from the EVAP 
control system pressure sensor

• Harness or connectors
• EVAP control system pressure sensor

August 2012

2012 Pathfinder

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-263

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

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2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-263, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE-2

With CONSULT

1. Select “EVAP DIAG READY” in “DATA MONITOR” mode of “ENGINE”.

2. Let it idle until “OFF” of “EVAP DIAG READY” changes to “ON”.

NOTE:

It will take at most 2 hours until “OFF” of “EVAP DIAG READY” changes to “ON”.

3. Turn ignition switch OFF and wait at least 90 minutes.

NOTE:

Never turn ignition switch ON during 90 minutes.

4. Turn ignition switch ON.

5. Select “EVAP LEAK DIAG” in “DATA MONITOR” mode of “ENGINE”.

6. Check that “EVAP LEAK DIAG” indication.
Which is displayed on CONSULT?

CMPLT >> GO TO 4.

YET

>> 1. Perform DTC CONFIRMATION PROCEDURE again.

2. GO TO 1.

4.

PERFORM DTC CONFIRMATION PROCEDURE-3

With CONSULT

Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-263, "Diagnosis Procedure"

.

NO

>> INSPECTION END

5.

PERFORM DTC CONFIRMATION PROCEDURE-4

With GST

1. Start engine and let it idle for least 40 seconds.

NOTE:

Do not depress accelerator pedal even slightly.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-263, "Diagnosis Procedure"

.

NO

>> GO TO 6.

6.

PERFORM DTC CONFIRMATION PROCEDURE-5

With GST

1. Let it idle for at least 2 hours.

2. Turn ignition switch OFF and wait at least 90 minutes.

NOTE:

Never turn ignition switch ON during 90 minutes.

3. Turn ignition switch ON.

4. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-263, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000007358178

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

August 2012

2012 Pathfinder

EC-264

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

2. Loosen and retighten three ground screws on the body. Refer to 

EC-97, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK EVPA CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER

1. Disconnect EVAP control system pressure sensor (2) harness

connector.

-

Fuel filler pipe (top of frame view) (1)

-

EVAP canister vent control valve (3)

-

EVAP canister (4)

-

Drain filter (5)

-

: Vehicle front

2. Check sensor harness connector for water.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace harness connector.

3.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-264, "Component Inspection"

.

OK or NG

OK

>> GO TO 4.

NG

>> Replace EVAP control system pressure sensor. Refer to 

FL-16, "Removal and Installation"

.

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

Component Inspection

INFOID:0000000007358179

EVAP CONTROL SYSTEM PRESSURE SENSOR

1. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.

Refer to 

FL-16, "Removal and Installation"

.

Do not reuse the O-ring, replace it with a new one.

2. Install a vacuum pump to EVAP control system pressure sensor.

BBIA0539E

Water should not exist.

AWBIA0134ZZ

August 2012

2012 Pathfinder