Nissan Quest E52. Manual - part 522

EC-298

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0447 EVAP CANISTER VENT CONTROL VALVE

3.

Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.

Operation takes less than 1 second.

Without CONSULT

1.

Clean the air passage [portion (A) to (B)] of EVAP canister vent
control valve using an air blower.

2.

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.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace EVAP canister vent control valve. Refer to 

FL-16, "Exploded View"

.

Condition VENT CONTROL/V

Air passage continuity between (A) and (B)

ON

No

OFF

Yes

Condition

Air passage continuity between (A) and (B)

12 V direct current supply between
 terminals (1) and (2)

No

OFF

Yes

JMBIA0169ZZ

P0448 EVAP CANISTER VENT CONTROL VALVE

EC-299

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0448 EVAP CANISTER VENT CONTROL VALVE

DTC Logic

INFOID:0000000009651134

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

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

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

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.

-

Increase the engine speed up to 3,000 to 3,500 rpm and keep it for 2 minutes and 50 seconds to 3 min-
utes.

Never exceed 3 minutes.

-

Fully released accelerator pedal and keep engine idle for about 5 seconds.

6.

Repeat next procedure 20 times.

-

Quickly increase the engine speed up to 4,000 to 4,500 rpm or more and keep it for 25 to 30 seconds.

-

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

7.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-299, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009651135

1.

CHECK RUBBER TUBE

1.

Turn ignition switch OFF.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0448

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

• EVAP canister is saturated with water

PBIB0972E

EC-300

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0448 EVAP CANISTER VENT CONTROL VALVE

2.

Disconnect rubber tube connected to EVAP canister vent control valve.

3.

Check the rubber tube for clogging.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Clean rubber tube using an air blower.

2.

CHECK EVAP CANISTER VENT CONTROL VALVE

Check EVAP canister vent control valve. Refer to 

EC-301, "Component Inspection"

.

Is he inspection result normal?

YES

>> GO TO 3.

NO

>> Replace EVAP canister vent control valve. Refer to 

FL-16, "Exploded View"

.

3.

CHECK IF EVAP CANISTER SATURATED WITH WATER

1.

Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached. Refer to 

FL-16, "Exploded View"

.

2.

Check if water will drain from the EVAP canister.

Does water drain from the EVAP canister?

YES

>> GO TO 4.

NO

>> GO TO 6.

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 2.1 kg (4.6 lb).

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> 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. Refer to 

FL-16, "Exploded View"

.

6.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

2.

Check that water is not inside connectors.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-16, "Exploded View"

.

7.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Check EVAP control system pressure sensor. Refer to 

EC-305, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-16, "Exploded View"

.

JMBIA1134GB

P0448 EVAP CANISTER VENT CONTROL VALVE

EC-301

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Component Inspection

INFOID:0000000009651136

1.

CHECK EVAP CANISTER VENT CONTROL VALVE-I

1.

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

FL-16, "Exploded View"

.

2.

Check portion (A) of EVAP canister vent control valve for rust.

Is it rusted?

YES

>> Replace EVAP canister vent control valve. Refer to 

FL-

16, "Exploded View"

.

NO

>> GO TO 2.

2.

CHECK EVAP CANISTER VENT CONTROL VALVE-II

With CONSULT

1.

Reconnect harness connectors disconnected.

2.

Turn ignition switch ON.

3.

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

4.

Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.

Operation takes less than 1 second.

Without CONSULT

1.

Disconnect EVAP canister vent control valve harness connector.

2.

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.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 3.

3.

CHECK EVAP CANISTER VENT CONTROL VALVE-III

With CONSULT

1.

Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.

2.

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

JMBIA0168ZZ

Condition VENT CONTROL/V

Air passage continuity between (A) and (B)

ON

Not existed

OFF

Existed

Condition

Air passage continuity between (A) and (B)

12 V direct current supply between
 terminals 1 and 2

Not existed

OFF

Existed

JMBIA0169ZZ