Nissan Frontier D22. Manual - part 345

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

EC-483

[KA24DE]

C

D

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F

G

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A

EC

11. Make sure of the following.

If the result is NG, go to 

EC-483, "Diagnostic Procedure"

 .

If the result is OK, go to “Diagnostic Procedure” for DTC P0442,

EC-316

 .

Overall Function Check

UBS00DBP

Use this procedure to check the overall function of the EVAP canister vent control valve circuit. During this
check, a 1st trip DTC might not be confirmed.

 WITH GST

1.

Disconnect hose from water separator.

2.

Disconnect EVAP canister vent control valve harness connector.

3.

Verify the following.

If the result is NG, go to 

EC-483, "Diagnostic Procedure"

 .

If the result is OK, perform trouble diagnosis for DTC P0442.
Refer to 

EC-316

 .

Diagnostic Procedure

UBS00DBQ

1. 

CHECK RUBBER TUBE

1.

Turn ignition switch OFF. 

2.

Check disconnection or obstruction of rubber tube connected to EVAP canister vent control valve.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or clean rubber tube.

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.

Condition

Air passage continuity between A  and 

B

Touching “ON”

No

Touching “OFF”

Yes

SEF805Y

Condition

Air passage continuity 

12V direct current supply between ter-
minals 1 and 2

No

No supply

Yes

BBIA0309E

BBIA0308E

EC-484

[KA24DE]

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

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.

Condition

Air passage continuity between 

A and B

12V direct current supply between 
terminals 1 and 2

No

OFF

Yes

SEF991Y

BBIA0309E

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

EC-485

[KA24DE]

C

D

E

F

G

H

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J

K

L

M

A

EC

5. 

CHECK VACUUM CUT VALVE

Check vacuum cut valve as follows:

1.

Plug port C  and D  with fingers.

2.

Apply vacuum to port A  and check that there is no suction from
port B .

3.

Apply vacuum to port B  and check that there is suction from
port A .

4.

Blow air in port B  and check that there is a resistance to flow out
of port A .

5.

Open port C  and D .

6.

Blow air in port A  check that air flows freely out of port C .

7.

Blow air in port B  check that air flows freely out of port D .

OK or NG

OK

>> GO TO 6.

NG

>> Replace vacuum cut valve.

6. 

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

1.

Remove EVAP canister with the vent control valve attached.

2.

Check if water will drain from the EVAP canister.

Yes or No

Yes

>> GO TO 9.

No

>> GO TO 7.

7. 

CHECK EVAP CANISTER

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

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

SEF186S

SEF379Q

SEF596U

EC-486

[KA24DE]

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

8. 

DETECT MALFUNCTIONING PART

Check the following.

1.

Visually check the EVAP canister for damage.

2.

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

3.

Check water separator.

–

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

–

Check visually for cracks or flaws in the appearance.

–

Check visually for cracks or flaws in the hose.

–

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

–

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

–

Do not disassemble water separator.

>> Repair hose or replace EVAP canister or water separa-

tor.

9. 

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 10.

NG

>> Install hose property or replace it.

10. 

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 11.

NG

>> Replace EVAP control system pressure sensor.

11. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Perform “DTC Confirmation Procedure”, for DTC P0452, 

EC-339

  and DTC P0453, 

EC-346

 .

OK or NG

OK

>> GO TO 12.

NG

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

12. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

PBIB1032E