Nissan Pathfinder (2009 year). Manual - part 339

EC-726

< COMPONENT DIAGNOSIS >

[VK56DE]

P0448 EVAP CANISTER VENT CONTROL VALVE

2.

Check portion B of 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.

 Without CONSULT-III

1.

Remove EVAP canister vent control valve from EVAP canister.

2.

Check portion B of EVAP canister vent control valve for rust.

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.

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.

VENT CONTROL/V Condition

Air passage continuity between A and B

ON

No

OFF

Yes

PBIB1033E

PBIB1033E

Condition

Air passage continuity between A and B

12V direct current supply between
 terminals 1 and 2

No

OFF

Yes

PBIB1034E

2009 Pathfinder

P0448 EVAP CANISTER VENT CONTROL VALVE

EC-727

< COMPONENT DIAGNOSIS >

[VK56DE]

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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.

PBIB3641E

2009 Pathfinder

EC-728

< COMPONENT DIAGNOSIS >

[VK56DE]

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

Component Description

INFOID:0000000003936660

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:0000000003936661

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

EC-775, "DTC Confirmation Procedure"

.

DTC Confirmation Procedure

INFOID:0000000003936662

NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting 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.

TESTING CONDITION:
Perform DTC Confirmation Procedure when the fuel level is between 1/4 and 3/4 full, and vehicle is
placed on flat level surface.
1.

Start engine and wait at least 100 seconds.
NOTE:
Do not depress accelerator pedal even slightly.

2.

Check 1st trip DTC.

3.

If 1st trip DTC is detected, go to 

EC-729, "Diagnosis Procedure"

.

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

4.

Turn ignition switch OFF and wait at least 10 seconds.

5.

Turn ignition switch ON.

6.

Turn ignition switch OFF and wait at least 10 seconds.

AWBIA0134ZZ

PBIB3370E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0451
0451

EVAP control system pressure 
sensor performance

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

• Harness or connectors
• EVAP control system pressure sensor

2009 Pathfinder

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-729

< COMPONENT DIAGNOSIS >

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7.

Start engine and wait at least 100 seconds.
NOTE:
Do not depress accelerator pedal even slightly.

8.

Check 1st trip DTC.

9.

If 1st trip DTC is detected, go to 

EC-729, "Diagnosis Procedure"

.

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

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

11. Turn ignition switch ON.

12. Turn ignition switch OFF and wait at least 10 seconds.
13. Start engine and wait at least 100 seconds.

NOTE:
Do not depress accelerator pedal even slightly.

14. Check 1st trip DTC.

15. If 1st trip DTC is detected, go to 

EC-729, "Diagnosis Procedure"

.

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

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

17. Turn ignition switch ON.

18. Turn ignition switch OFF and wait at least 10 seconds.
19. Start engine and wait at least 100 seconds.

NOTE:
Do not depress accelerator pedal even slightly.

20. Check 1st trip DTC.

21. If 1st trip DTC is detected, go to 

EC-729, "Diagnosis Procedure"

.

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

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

23. Turn ignition switch ON.

24. Turn ignition switch OFF and wait at least 10 seconds.
25. Start engine and wait at least 100 seconds.

NOTE:
Do not depress accelerator pedal even slightly.

26. Check 1st trip DTC.

27. If 1st trip DTC is detected, go to 

EC-729, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003936663

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten ground screws on the body.
Refer to 

EC-568, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER

BBIA0539E

2009 Pathfinder

EC-730

< COMPONENT DIAGNOSIS >

[VK56DE]

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

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-730, "Component Inspection"

.

OK or NG

OK

>> GO TO 4.

NG 

>> Replace EVAP control system pressure sensor.

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-49, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000003936664

EVAP CONTROL SYSTEM PRESSURE SENSOR

1.

Remove EVAP control system pressure sensor with its harness connector.
Always replace O-ring with a new one.

2.

Install a vacuum pump to EVAP control system pressure sensor.

3.

Turn ignition switch ON and check output voltage between ECM
terminal 32 and ground under the following conditions.

CAUTION:

• Always calibrate the vacuum pump gauge when using it.
• Never apply below -93.3 kPa (-0.952 kg/cm

2

, -13.53 psi) or

pressure over 101.3 kPa (1.033 kg/cm

2

, 14.69 psi).

4.

If NG, replace EVAP control system pressure sensor.

Water should not exist.

AWBIA0134ZZ

Applied vacuum

[kPa (kg/cm

2

, psi)]

Voltage

Not applied

1.8 - 4.8 V

-26.7 (-0.272, -3.87)

2.1 to 2.5 V lower than above value

PBIB1173E

2009 Pathfinder

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-731

< COMPONENT DIAGNOSIS >

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P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

Component Description

INFOID:0000000004333366

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:0000000003936666

NOTE:
If DTC P0452 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-770, "DTC Confirmation Procedure"

.

DTC Confirmation Procedure

INFOID:0000000003936667

NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting 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.

TESTING CONDITION:
Always perform test at a temperature of 5

°

C (41

°

F) or more.

 WITH CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON.

4.

Turn ignition switch OFF and wait at least 10 seconds.

5.

Turn ignition switch ON.

6.

Select “DATA MONITOR” mode with CONSULT-III.

7.

Check that “FUEL T/TMP SE” is more than 0

°

C (32

°

F).

AWBIA0134ZZ

PBIB3370E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0452
0452

EVAP control system pressure 
sensor low input

An excessively low voltage from the sensor 
is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted.)

• EVAP control system pressure sensor

2009 Pathfinder

EC-732

< COMPONENT DIAGNOSIS >

[VK56DE]

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

8.

Start engine and wait at least 20 seconds.

9.

Check 1st trip DTC.

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

EC-732, "Diagnosis Procedure"

.

 WITH GST

1.

Start engine and warm it up to normal operating temperature.

2.

Check that voltage between ECM terminal 107 (Fuel tank tem-
perature sensor signal) and ground is less than 4.2V.

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Turn ignition switch ON.

5.

Turn ignition switch OFF and wait at least 10 seconds.

6.

Start engine and wait at least 20 seconds.

7.

Select Service $07 with GST.
If 1st trip DTC is detected, go to 

EC-732, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003936668

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten ground screws on the body.
Refer to 

EC-568, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK CONNECTOR

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 POWER SUPPLY CIRCUIT

1.

Turn ignition switch ON.

PBIB1110E

BBIA0539E

Water should not exist.

AWBIA0134ZZ

2009 Pathfinder

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-733

< COMPONENT DIAGNOSIS >

[VK56DE]

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2.

Check voltage between EVAP control system pressure sensor
terminal 3 and ground with CONSULT-III or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors C1, E41
• Harness connectors E5, F14
• Harness for open or short between EVAP control system pressure sensor and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

5.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal
67.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors C1, E41
• Harness connectors E5, F14
• Harness for open or short between EVAP control system pressure sensor and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

7.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND

SHORT

1.

Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal
2.
Refer to Wiring Diagram.

2.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors C1, E41
• Harness connectors E5, F14

Voltage: Approximately 5 V

PBIB0138E

Continuity should exist.

Continuity should exist.

2009 Pathfinder