Nissan Murano: Dtc/circuit Diagnosis / P0447 Evap Canister Vent Control Valve

DTC Description

DTC DETECTION LOGIC

An improper voltage signal is sent to ECM through EVAP canister vent control valve.

POSSIBLE CAUSE

• Harness or connectors

  (The valve circuit is open or shorted.)

• EVAP canister vent control valve

• Hoses

  (Hoses are connected incorrectly or clogged.)

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.

TESTING CONDITION:

Before performing the following procedure, confirm battery voltage is more than 11 V at idle.

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and wait at least 8 seconds.

2. 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

INSPECTION START

Will CONSULT be used?

Will CONSULT be used?

GO TO 2.

GO TO 3.

CHECK EVAP CANISTER VENT CONTROL VALVE CIRCUIT

With CONSULT

1. Turn ignition switch OFF and then ON.

2. Select “VENT CONTROL/V” in “ACTIVE TEST” mode with CONSULT.

3. Touch “ON/OFF” on CONSULT screen.

4. Check for operating sound of the valve.

   Clicking sound should be heard.

Is the inspection result normal?

GO TO 6.

GO TO 3.

CHECK EVAP CANISTER VENT CONTROL VALVE POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect EVAP canister vent control valve harness connector.

3. Turn ignition switch ON.

4. Check the voltage between EVAP canister vent control valve harness connector and ground.

   EVAP canister vent control valve		Ground	Voltage
   Connector	Terminal
   B31	1	Ground	Battery voltage

Is the inspection result normal?

GO TO 4.

Perform the trouble diagnosis for power supply circuit.

CHECK EVAP CANISTER VENT CONTROL VALVE OUTPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between ECM harness connector and EVAP canister vent control valve harness connector.

   Refer to Wiring Diagram.

   EVAP canister vent control valve		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   B31	2	E32	141	Existed

4. Also check harness for short to ground and short to power.

Is the inspection result normal?

GO TO 5.

Repair open circuit, short to ground or short to power in harness or connectors.

CHECK RUBBER TUBE FOR CLOGGING

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

2. Check the rubber tube for clogging.

Is the inspection result normal?

GO TO 6.

Clean the rubber tube using an air blower.

CHECK EVAP CANISTER VENT CONTROL VALVE

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

Is the inspection result normal?

INSPECTION END

Replace EVAP canister vent control valve. 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.