Nissan Frontier D22. Manual - part 343

DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

EC-475

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9. 

CHECK EVAP CANISTER VENT CONTROL VALVE-II

 With CONSULT-II

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.

 Without CONSULT-II

Check air passage continuity and operation delay time under the fol-
lowing condition.

Operation takes less than 1 second.

OK or NG

OK

>> GO TO 11.

NG

>> GO TO 10.

10. 

CHECK EVAP CANISTER VENT CONTROL VALVE-III

1.

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

2.

Perform Test No. 9 again.

OK or NG

OK

>> GO TO 11.

NG

>> Replace EVAP canister vent control valve.

Condition

Air passage continuity between 

A and B

12V direct current supply between 
terminals 1 and 2

No

OFF

Yes

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BBIA0309E

EC-476

[KA24DE]

DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

11. 

CHECK RUBBER TUBE

Check for obstructed water separator and rubber tube connected to EVAP canister vent control valve and
clean the rubber tube using air blower. 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.

●

Do not disassemble water separator.

OK or NG

OK

>> GO TO 12.

NG

>> Clean, repair or replace rubber tube and/or water sepa-

rator.

12. 

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 13.

No

>> GO TO 14.

13. 

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 15.

NG

>> GO TO 14.

14. 

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.

15. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-116, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"

 .

>> INSPECTION END.

PBIB1032E

SEF596U

DTC P1446 EVAP CANISTER VENT CONTROL VALVE

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DTC P1446 EVAP CANISTER VENT CONTROL VALVE

PFP:14935

Component Description

UBS00DBG

The EVAP canister vent control valve is located on the EVAP canis-
ter and is used to seal the canister vent.
This solenoid (the EVAP canister vent control valve) responds to sig-
nals 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

UBS00DBH

Specification data are reference values.

On Board Diagnosis Logic

UBS00DBI

DTC Confirmation Procedure

UBS00DBJ

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.
TESTING CONDITION:
Always perform at a temperature above 0

°C (32°F).

 WITH CONSULT-II 

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 5 seconds.

3.

Turn ignition switch ON.

4.

Select “DATA MONITOR” mode with CONSULT-II.

5.

Check that “FUEL T/TMP SE” is 0

°C (32°F) or more.

6.

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

7.

If 1st trip DTC is detected, go to 

EC-478, "Diagnostic Procedure"

.

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

 WITH GST

1.

Start engine and warm it up to normal operating temperature.

SEF378Q

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.

●

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

SEF189Y

EC-478

[KA24DE]

DTC P1446 EVAP CANISTER VENT CONTROL VALVE

2.

Check that voltage between ECM terminal 60 (fuel tank temper-
ature sensor signal) and ground is less than 4.2V.

3.

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

4.

Select “MODE 7” with GST.

5.

If 1st trip DTC is detected, go to 

EC-478, "Diagnostic Procedure"

.

Diagnostic Procedure

UBS00DBK

1. 

CHECK RUBBER TUBE FOR CLOGGING

Check obstructed water separator and rubber tube to EVAP canister vent control valve and clean the rubber
tube using air blower.
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.

●

Do not disassemble water separator.

OK or NG

OK

>> GO TO 2.

NG

>> Clean, repair or replace rubber tube and/or water sepa-

rator.

2. 

CHECK EVAP CANISTER VENT CONTROL VALVE-I

1.

Remove EVAP canister vent control valve from EVAP canister.

2.

Check portion B  of EVAP canister vent control valve for being
rusted.

OK or NG

OK

>> GO TO 3.

NG

>> Replace EVAP canister vent control valve.

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PBIB1032E

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