Nissan Frontier D22. Manual - part 493

DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

EC-1075

[VG33E]

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10. 

CHECK EVAP CANISTER VENT CONTROL VALVE

 With CONSULT-II

1.

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

2.

Check air passage continuity and operation delay time.

Operation takes less than 1second.

Without CONSULT-II 

1.

Check air passage continuity and operation delay time under the
following condition.

Operation takes less than 1second.

If NG or operation takes more than 1 second, clean valve using air
blower or replace as necessary.
If portion B  is rusted, replace control valve.
Make sure new O-ring is installed properly.
OK or NG

OK

>> GO TO 11.

NG

>> Replace EVAP canister vent control valve.

11. 

CHECK RUBBER TUBE

Check for obstructed rubber tube connected to EVAP canister vent control valve.

OK or NG

OK

>> GO TO 12.

NG

>> Clean, repair or replace rubber tube.

12. 

CHECK WATER SEPARATOR

1.

Check visually for insect nests in the water separator air inlet.

2.

Check visually for cracks or flaws in the appearance.

3.

Check visually for cracks or flaws in the hose.

4.

Check that A  and C  are not clogged by blowing air into B  with
A , and then C  plugged.

5.

In case of NG in items 2 - 4, replace the parts.

NOTE:

●

Do not disassemble water separator.

OK or NG

OK

>> GO TO 13.

NG

>> Replace water separator.

Condition VENT CONTROL/V

Air passage continuity between 

A and B

ON

No

OFF

Yes

SEF013Z

Condition

Air passage continuity between A 

and B

12V direct current supply 
between terminals 1 and 2

No

OFF

Yes

BBIA0309E

PBIB1032E

EC-1076

[VG33E]

DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

13. 

CHECK IF EVAP CANISTER SATURATED WITH WATER

1.

Remove EVAP canister with EVAP canister vent control valve attached.

2.

 Check if water will drain from the EVAP canister.

Yes or No

Yes

>> GO TO 14.

No

>> GO TO 16.

14. 

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 16.

NG

>> GO TO 15.

15. 

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.

16. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

SEF596U

DTC P1446 EVAP CANISTER VENT CONTROL VALVE

EC-1077

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DTC P1446 EVAP CANISTER VENT CONTROL VALVE

PFP:14935

Component Description

UBS00DOS

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 (Small Leak)” diagnosis.

CONSULT-II Reference Value in Data Monitor Mode

UBS00DOT

Specification data are reference values.

On Board Diagnosis Logic

UBS00DOU

DTC Confirmation Procedure

UBS00DOV

CAUTION:

Always drive vehicle at a safe speed.

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.

 WITH CONSULT-II

1.

Turn ignition switch ON.

SEF032W

SEF143S

MONITOR ITEM

CONDITION

SPECIFICATION

VENT CONT/V

●

Ignition switch: ON

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1446

EVAP canister vent con-
trol valve close

EVAP canister vent control valve remains 
closed under specified driving conditions.

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EVAP canister vent control valve

●

EVAP control system pressure sensor 
and the circuit

●

Blocked rubber tube to EVAP canister 
vent control valve

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Water separator

●

EVAP canister is saturated with water

EC-1078

[VG33E]

DTC P1446 EVAP CANISTER VENT CONTROL VALVE

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine.

4.

Drive vehicle at a speed of approximately 80 km/h (50 MPH) for
a maximum of 15 minutes.

NOTE:
If a malfunction exists, NG result may be displayed quicker.

5.

If 1st trip DTC is detected, go to 

EC-1080, "Diagnostic Proce-

dure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

SEF201Y