Infiniti Q45. Manual — part 447

DTC P0447 EVAP CANISTER VENT CONTROL VALVE

EC-427

C

D

E

F

G

H

I

J

K

L

M

A

EC

2.

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to

EC-428, "Component Inspection"

.

OK or NG

OK

>> GO TO 3.

NG

>> Replace EVAP canister vent control valve.

3.

CHECK VACUUM CUT VALVE

Refer to

EC-577, "Component Inspection"

.

OK or NG

OK

>> GO TO 4.

NG

>> Replace vacuum cut valve.

4.

CHECK IF EVAP CANISTER SATURATED WITH WATER

1.

Remove EVAP canister with EVAP canister vent control valve attached.

2.

Does water 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 attached.
The weight should be less than 1.8 kg (4.0 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 water separator for clogging or poor connection

>> Repair hose or replace EVAP canister.

7.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR HOSE

Check disconnection or improper connection of hose connected to EVAP control system pressure sensor.

OK or NG

OK

>> GO TO 8.

NG

>> Repair it.

SEF596U

EC-428

DTC P0447 EVAP CANISTER VENT CONTROL VALVE

8.

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 9.

NG

>> Replace EVAP control system pressure sensor.

9.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to

EC-450, "Component Inspection"

.

OK or NG

OK

>> GO TO 10.

NG

>> Replace EVAP control system pressure sensor.

10.

CHECK INTERMITTENT INCIDENT

Refer to

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

.

>> INSPECTION END

Component Inspection

NBS001XG

EVAP CANISTER VENT CONTROL VALVE

With CONSULT-II

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.

5.

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

6.

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

Operation takes less than 1 second.

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.

Water should not exist.

SEF337X

Condition VENT CONTROL/V

Air passage continuity between A and B

ON

No

OFF

Yes

PBIB1679E

DTC P0447 EVAP CANISTER VENT CONTROL VALVE

EC-429

C

D

E

F

G

H

I

J

K

L

M

A

EC

Without CONSULT-II

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.
Make sure new O-ring is installed properly.

Operation takes less than 1 second.

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.

SEF337X

Condition

Air passage continuity between A and B

12V direct current supply between
terminals 1 and 2

No

OFF

Yes

PBIB0154E

EC-430

DTC P0448 EVAP CANISTER VENT CONTROL VALVE

DTC P0448 EVAP CANISTER VENT CONTROL VALVE

PFP:16935

Component Description

NBS0022W

The EVAP canister vent control valve is located on the EVAP canis-
ter 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.

CONSULT-II Reference Value in Data Monitor Mode

NBS0022X

Specification data are reference values.

On Board Diagnosis Logic

NBS0022Y

SEF032W

PBIB0026E

MONITOR ITEM

CONDITION

SPECIFICATION

VENT CONT/V

●

Ignition switch: ON

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0448
0448

EVAP canister vent control
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

●

Water separator

●

EVAP canister is saturated with water