Nissan Titan. Manual — part 252

P0448 EVAP CANISTER VENT CONTROL VALVE

EC-309

< DTC/CIRCUIT DIAGNOSIS >

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8. If 1st trip DTC is detected, go to

EC-309, "Diagnosis Procedure"

.

If 1st trip DTC is not detected, go to the next step.

9. Repeat next procedure 20 times.
a. Quickly increase the engine speed up to 4,000 to 4,500 rpm or more and keep it for 25 to 30 seconds.
b. Fully released accelerator pedal and keep engine idle for at least 35 seconds.

10. Check 1st trip DTC.
11. If 1st trip DTC is detected, go to

EC-309, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009886720

1.

CHECK RUBBER TUBE

1. Turn ignition switch OFF.

2. Disconnect rubber tube connected to EVAP canister vent control

valve (4).

3. Check the rubber tube for clogging.
OK or NG

OK

>> GO TO 2.

NG

>> Clean rubber tube using an air blower.

2.

CHECK DRAIN FILTER

Refer to

EC-310, "Component Inspection"

.

OK or NG

OK

>> GO TO 3.

NG

>> Replace drain filter.

3.

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to

EC-310, "Component Inspection"

.

OK or NG

OK

>> GO TO 4.

NG

>> Replace EVAP canister vent control valve.

4.

CHECK IF EVAP CANISTER SATURATED WITH WATER

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor

attached.

PBIB0972E

1

: Drain filter

2

: EVAP control system pressure sensor

3

: EVAP canister

ALBIA0401ZZ

EC-310

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P0448 EVAP CANISTER VENT CONTROL VALVE

2. Check if water will 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 and EVAP control system pressure sensor

attached.

The weight should be less than 2.5 kg (5.5 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 drain filter for clogging or poor connection

>> Repair hose or replace EVAP canister.

7.

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 8.

NG

>> Replace EVAP control system pressure sensor.

8.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to

EC-315, "Component Inspection"

.

OK or NG

OK

>> GO TO 9.

NG

>> Replace EVAP control system pressure sensor.

9.

CHECK INTERMITTENT INCIDENT

Refer to

GI-39, "How to Check Terminal"

and

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009886721

EVAP CANISTER VENT CONTROL VALVE

With CONSULT

1. Remove EVAP canister vent control valve from EVAP canister.

BBIA0351E

Water should not exist.

P0448 EVAP CANISTER VENT CONTROL VALVE

EC-311

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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 that 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.

Without CONSULT

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 that 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.

DRAIN FILTER

1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.

Condition VENT CONTROL/V

Air passage continuity between A and B

ON

No

OFF

Yes

PBIB1033E

PBIB1033E

Condition

Air passage continuity between A and B

12V direct current supply between
terminals 1 and 2

No

OFF

Yes

PBIB1034E

EC-312

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P0448 EVAP CANISTER VENT CONTROL VALVE

4. Blow air into port A and check that it flows freely out of port B.
5. Block port B.
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter.

PBIB3641E