Nissan Maxima Service and Repair Manual: P0447 evap canister vent control valve

Description

The EVAP canister vent control valve is located on the EVAP canister and is used to seal the canister vent.

This solenoid valve responds to signals 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 evaporative emission control system is depressurized and allows "EVAP Control System" diagnosis.

DTC Logic

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.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.

2.PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and wait at least 8 seconds.
2. Check 1st trip DTC.

Diagnosis Procedure

1.INSPECTION START

2.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.

3.CHECK EVAP CANISTER VENT CONTROL VALVE POWER SUPPLY CIRCUIT

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.

4.DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors B10, E29
• Harness connectors E11, F2
• Harness for open or short between EVAP canister vent control valve and IPDM E/R

5.CHECK EVAP CANISTER VENT CONTROL VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

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.

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

6.DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors B10, E29
• Harness for open or short between EVAP canister vent control valve and ECM

7.CHECK RUBBER TUBE FOR CLOGGING

1. Disconnect rubber tube connected to EVAP canister vent control valve.
2. Check the rubber tube for clogging.

8.CHECK DRAIN FILTER

9.CHECK EVAP CANISTER VENT CONTROL VALVE

10.CHECK INTERMITTENT INCIDENT

Component Inspection

EVAP CANISTER VENT CONTROL VALVE

1.CHECK EVAP CANISTER VENT CONTROL VALVE-I

1. Remove EVAP canister vent control valve from EVAP canister. Refer to FL-16, "Removal and Installation".
2. Check portion (A) of  EVAP canister vent control valve for rust.

2.CHECK EVAP CANISTER VENT CONTROL VALVE-II

With CONSULT

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.

   Check that new O-ring is installed properly.

Operation takes less than 1 second.

Without CONSULT

1. Disconnect EVAP canister vent control valve harness connector.
2. Check air passage continuity and operation delay time under the following conditions.

   Check that new O-ring is installed properly.

Operation takes less than 1 second.

3.CHECK EVAP CANISTER VENT CONTROL VALVE

With CONSULT

1. Clean the air passage [portion (A) to (B)] of  EVAP canister vent control valve using an air blower.
2. Perform "VENT CONTROL/V" in "ACTIVE TEST" mode.
3. Check air passage continuity and operation delay time.

   Check that new O-ring is installed properly.

Operation takes less than 1 second.

Without CONSULT

1. Clean the air passage [portion (A) to (B)] of  EVAP canister vent control valve using an air blower.
2. Check air passage continuity and operation delay time under the following conditions.

Check that new O-ring is installed properly.

Operation takes less than 1 second.

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.
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.