Nissan Murano: Dtc/circuit Diagnosis / P0448 Evap Canister Vent Control Valve

DTC Description

DTC DETECTION LOGIC

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

POSSIBLE CAUSE

• EVAP canister vent control valve

• EVAP control system pressure sensor and the circuit

• Blocked rubber tube to EVAP canister vent control valve

• EVAP canister is saturated with water

FAIL-SAFE

Not applicable

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn ignition switch ON and wait at least 5 seconds.

2. Turn ignition switch OFF and wait at least 10 seconds.

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

4. Start engine and let it idle for at least 1 minute.

5. Repeat next procedures 3 times.

   1. Increase the engine speed up to 3,000 to 3,500 rpm and keep it for 2 minutes and 50 seconds to 3 minutes.

      Never exceed 3 minutes.

   2. Fully released accelerator pedal and keep engine idle for about 5 seconds.

6. Repeat next procedure 20 times.

   • Quickly increase the engine speed up to 4,000 to 4,500 rpm or more and keep it for 25 to 30 seconds.

   • Fully released accelerator pedal and keep engine idle for at least 35 seconds.

     

7. Check 1st trip DTC.

Is 1st trip DTC detected?

Proceed to Diagnosis Procedure.

To check malfunction symptom before repair: Refer to Intermittent Incident.

Confirmation after repair: INSPECTION END

CHECK RUBBER TUBE

1. Turn ignition switch OFF.

2. Disconnect rubber tube connected to EVAP canister vent control valve.

3. Check the rubber tube for clogging.

Is the inspection result normal?

GO TO 2.

Clean rubber tube using an air blower.

CHECK EVAP CANISTER VENT CONTROL VALVE

Check EVAP canister vent control valve. Refer to Component Inspection.

Is he inspection result normal?

GO TO 3.

Replace EVAP canister vent control valve. Refer to Removal and Installation.

CHECK IF EVAP CANISTER SATURATED WITH WATER

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached. Refer to Removal and Installation.

2. Check if water will drain from the EVAP canister.

   

Does water drain from the EVAP canister?

GO TO 4.

GO TO 6.

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 2.1 kg (4.6 lb).

Is the inspection result normal?

GO TO 6.

GO TO 5.

DETECT MALFUNCTIONING PART

Check the following.

• EVAP canister for damage

• EVAP hose between EVAP canister and Nissan Murano vehicle frame for clogging or poor connection

Repair hose or replace EVAP canister. Refer to Removal and Installation.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1. Disconnect EVAP control system pressure sensor harness connector.

2. Check that water is not inside connectors.

Is the inspection result normal?

GO TO 7.

Replace EVAP control system pressure sensor. Refer to Removal and Installation.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Check EVAP control system pressure sensor. Refer to Component Inspection.

Is the inspection result normal?

INSPECTION END

Replace EVAP control system pressure sensor. Refer to Removal and Installation.

CHECK EVAP CANISTER VENT CONTROL VALVE-1

1. Disconnect hose from (A), (B), and (C) with remaining harness connector connected.

2. Block port (B).

3. Blow air into port (A) and check that it flows freely out of port (C).

Is sufficient air flowed from port (C)?

GO TO 2.

Replace EVAP canister vent control valve. Refer to Removal and Installation.

CHECK EVAP CANISTER VENT CONTROL VALVE-2

With CONSULT

1. Turn iginition switch ON.

2. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode of “ENGINE” using CONSULT and select "ON" to close EVAP canister vent control valve.

3. Block port (B).

4. Blow air into port (A) and check that where is leakage point of air.

Where is leakage point?

Replace EVAP canister vent control valve. Refer to Removal and Installation.

GO TO 3.

INSPECTION END

CHECK EVAP CANISTER VENT CONTROL VALVE-3

Visually check connection portion between EVAP canister vent control valve and EVAP canister for cracks and damage.

Is the inspection result normal?

Replace EVAP canister and EVAP canister vent control valve. Refer to Removal and Installation.

Replace EVAP canister. Refer to Removal and Installation.