Nissan Frontier D40. Manual - part 386

P0448 EVAP CANISTER VENT CONTROL VALVE

EC-235

< COMPONENT DIAGNOSIS >

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4.

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 6.

NG

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

>> Repair hose or replace EVAP canister.

6.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1.

Disconnect EVAP control system pressure sensor (2) harness
connector.
- EVAP canister vent control valve (1)
- Drain filter (3)
- EVAP canister (4)
- 

 : Vehicle front

2.

Check that water is not inside connectors.

OK or NG

OK

>> GO TO 7.

NG

>> Replace EVAP control system pressure sensor.

7.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-247, "Component Inspection"

.

OK or NG

OK

>> GO TO 8.

NG

>> Replace EVAP control system pressure sensor.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-46, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005273232

EVAP CANISTER VENT CONTROL VALVE

 With CONSULT-III

1.

Remove EVAP canister vent control valve from EVAP canister.

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.

ALBIA0514ZZ

PBIB1033E

EC-236

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P0448 EVAP CANISTER VENT CONTROL VALVE

5.

Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.

6.

Check air passage continuity and operation delay time.

Operation takes less than 1 second.
Make sure new O-ring is installed properly.
If NG, replace EVAP canister vent control valve.
If OK, 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.

 Without CONSULT-III

1.

Remove EVAP canister vent control valve from EVAP canister.

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.

Operation takes less than 1 second.
Make sure new O-ring is installed properly.
If NG, replace EVAP canister vent control valve.
If OK, 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.

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

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-237

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P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

Component Description

INFOID:0000000005273233

The EVAP control system pressure sensor (2) detects pressure in
the purge line. The sensor output voltage to the ECM increases as
pressure increases.
• EVAP canister vent control valve (1)
• Drain filter (3)
• EVAP canister (4)
•

 : Vehicle front

On Board Diagnosis Logic

INFOID:0000000005273234

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

EC-285

.

DTC Confirmation Procedure

INFOID:0000000005273235

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

 WITH CONSULT-III

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Start engine and wait at least 40 seconds.

3.

Check 1st trip DTC.

4.

If 1st trip DTC is detected, go to 

EC-237, "Diagnosis Procedure"

.

NOTE:
Do not depress accelerator pedal even slightly.

 WITH GST

Follow the procedure “WITH CONSULT-III” above.

Diagnosis Procedure

INFOID:0000000005273236

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

ALBIA0514ZZ

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

EC-238

< COMPONENT DIAGNOSIS >

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P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

2.

 Loosen and retighten two ground screws on the body. Refer to 

EC-90, "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.
- EVAP canister vent control valve (1)
- Drain filter (3)
- EVAP canister (4)

 : Vehicle front

2.

Check that water is not inside connector.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace harness connector.

3.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-238, "Component Inspection"

.

OK or NG

OK

>> GO TO 4.

NG

>> Replace EVAP control system pressure sensor.

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-46, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005273237

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).

BBIA0614E

ALBIA0514ZZ

Applied vacuum kPa

(kg/cm

2

, psi)

Voltage (V)

Not applied

1.8 - 4.8

-26.7 (-0.272, -3.87)

2.1 to 2.5V lower than above value

PBIB1200E