Nissan Pathfinder (2012 year). Manual - part 338

P0448 EVAP CANISTER VENT CONTROL VALVE

EC-785

< DTC/CIRCUIT DIAGNOSIS >

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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. Refer to 

EC-516

.

PBIB3641E

August 2012

2012 Pathfinder

EC-786

< DTC/CIRCUIT DIAGNOSIS >

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P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

Component Description

INFOID:0000000007358654

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:0000000007358655

NOTE:

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

EC-836, "DTC Confirmation Procedure"

.

DTC Confirmation Procedure

INFOID:0000000007358656

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.

2. Check 1st trip DTC.

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

August 2012

2012 Pathfinder

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-787

< DTC/CIRCUIT DIAGNOSIS >

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Is 1st trip DTC detected?

YES

>> Proceed to 

EC-787, "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-787, "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-787, "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-787, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000007358657

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten ground screws on the body.

August 2012

2012 Pathfinder

EC-788

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-623, "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

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-788, "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:0000000007358658

EVAP CONTROL SYSTEM PRESSURE SENSOR

1. Remove EVAP control system pressure sensor with its harness connector. Refer to 

FL-16, "Removal and

Installation"

.

Always replace O-ring 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

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-789

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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. Refer to 

FL-16, "Removal and Installation"

.

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

August 2012

2012 Pathfinder

EC-790

< DTC/CIRCUIT DIAGNOSIS >

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P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

Component Description

INFOID:0000000007358659

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:0000000007358660

NOTE:

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

EC-831, "DTC Confirmation Procedure"

.

DTC Confirmation Procedure

INFOID:0000000007358661

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

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.
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

August 2012

2012 Pathfinder

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-791

< DTC/CIRCUIT DIAGNOSIS >

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8. Start engine and wait at least 20 seconds.
9. Check 1st trip DTC.
10. If 1st trip DTC is detected, go to 

EC-791, "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-791, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000007358662

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten ground screws on the body.

Refer to 

EC-623, "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

August 2012

2012 Pathfinder

EC-792

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

2. Check voltage between EVAP control system pressure sensor

terminal 3 and ground with CONSULT 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.

August 2012

2012 Pathfinder