Nissan Frontier D22. Manual - part 344

DTC P1446 EVAP CANISTER VENT CONTROL VALVE

EC-479

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3. 

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 5. 

NG

>> GO TO 4.

4. 

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. 3 again.

OK or NG 

OK

>> GO TO 5.

NG

>> Replace EVAP canister vent control valve.

5. 

CHECK IF EVAP CANISTER IS 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 6.

No

>> GO TO 8.

Condition

Air passage continuity between 

A and B

12V direct current supply between 
terminals 1 and 2

No

OFF

Yes

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EC-480

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DTC P1446 EVAP CANISTER VENT CONTROL VALVE

6. 

CHECK EVAP CANISTER

Weigh the EVAP canister with EVAP canister vent control valve attached.
The weight should be less than 1.8 kg (4.0 lb).

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

DETECT MALFUNCTIONING PART

Check the following.

●

Visually check the EVAP canister for damage.

●

Check hose connection between EVAP canister and water separator for clogging and poor connection.

>> Repair hose or replace EVAP canister.

8. 

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 9.

NG

>> Install hose properly or replace it.

9. 

CHECK HARNESS CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

2.

Check harness connector for water.
Water should not exist.

OK or NG

OK

>> GO TO 10.

NG

>> Replace EVAP control system pressure sensor.

10. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR AND CIRCUIT

Refer to “DTC Confirmation Procedure”, for DTC P0452, 

EC-339

  and DTC P0453, 

EC-346

 .

OK or NG

OK

>> GO TO 11.

NG

>> Replace EVAP control system pressure sensor and repair or replace harness and connector.

11. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

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DTC P1448 EVAP CANISTER VENT CONTROL VALVE

PFP:14935

Component Description

UBS00DBL

NOTE:
If DTC P1448 is displayed with P0442, perform trouble diagno-
sis for DTC P1448 first.
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

UBS00DBM

Specification data are reference values.

On Board Diagnosis Logic

UBS00DBN

SEF378Q

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MONITOR ITEM

CONDITION

SPECIFICATION

VENT CONT/V

●

Ignition switch: ON

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1448

EVAP canister vent con-
trol valve open

EVAP canister vent control valve remains 
opened 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

●

Vacuum cut valve

EC-482

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DTC P1448 EVAP CANISTER VENT CONTROL VALVE

DTC Confirmation Procedure

UBS00DBO

NOTE:

●

If DTC P1448 is displayed with P0442, first perform trouble diagnosis for DTC P1448.

●

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

TESTING CONDITION:

●

Perform “DTC WORK SUPPORT” when the fuel level is less than 3/4 full and vehicle is placed on
flat level surface.

●

Always perform test at a temperature of 0 to 30

°C (32 to 86°F).

1.

Turn ignition switch ON.

2.

Turn ignition switch OFF and wait at least 5 seconds.

3.

Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.

4.

Check that the following conditions are met.

5.

Select “EVAP SML LEAK P0442/P1442” of “EVAP SYSTEM” in
“DTC WORK SUPPORT” mode with CONSULT-II.
Follow the instruction displayed.

NOTE:

●

If the engine speed cannot be maintained within the range displayed on CONSULT-II screen, go
to 

EC-74, "Basic Inspection"

 .

6.

Make sure that “OK” is displayed.
If “NG” is displayed, go to following step.

NOTE:
Make sure that EVAP hoses are connected to EVAP canister
purge volume control solenoid valve properly.

7.

Stop engine and wait at least 10 seconds, then turn ON.

8.

Disconnect hose from water separator.

9.

Select  “VENT CONTROL/V” of “ACTIVE TEST” mode with
CONSULT-II.

10. Touch “ON” and “OFF” alternately.

COOLAN TEMP/S

0 - 70

°C (32 - 158°F)

INT/A TEMP SE

0 - 60

°C (32 - 140°F)

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