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Home >> Nissan-Datsun >> 2008 >> Maxima SL >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P0137 To P0447 >> DTC P0447 EVAP Canister Vent Control Valve >> Diagnostic Procedure

Diagnostic Procedure

  1. INSPECTION START 

    Do you have CONSULT-III?

    Yes or No 

    YES: GO TO  2.

    NO: GO TO  3.

  2. CHECK EVAP CANISTER VENT CONTROL VALVE CIRCUIT 

    With CONSULT-III 

    1. Turn ignition switch OFF and then turn ON.
    2. Select "VENT CONTROL/V" in "ACTIVE TEST" mode with CONSULT-III.
    3. Touch "ON/OFF" on CONSULT-III screen.
    4. Check for operating sound of the valve.

      Clicking noise should be heard  .

    OK or NG 

    OK: GO TO  7.

    NG: GO TO  3.

  3. CHECK EVAP CANISTER VENT CONTROL VALVE POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect EVAP canister vent control valve harness connector.
      Fig 1: Identifying EVAP Control System Pressure Sensor Harness Connector
      G04915128Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between EVAP canister vent control valve terminal 1 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

    Fig 2: Checking Voltage Between EVAP Canister Vent Control Valve Terminal 1 And Ground
    G04875239Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO  4.

  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E131, M92
    • Harness connectors M84, B101
    • Harness for open or short between EVAP canister vent control valve and IPDM E/R
    • Harness for open or short between EVAP canister vent control valve and ECM

      • >> Repair harness or connectors.

  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 harness continuity between ECM terminal 117 and EVAP canister vent control valve terminal 2.

      Refer to Wiring Diagram.

      Continuity should exist  .

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

    OK or NG 

    OK: GO TO  7.

    NG: GO TO  6.

  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors B101, M84
    • Harness for open or short between EVAP canister vent control valve and ECM

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

  7. CHECK RUBBER TUBE FOR CLOGGING 
    1. Disconnect rubber tube connected to EVAP canister vent control valve.
    2. Check the rubber tube for clogging.

    OK or NG 

    OK: GO TO  8.

    NG: Clean the rubber tube using an air blower.

  8. CHECK EVAP CANISTER VENT CONTROL VALVE 

    Refer to "COMPONENT INSPECTION ."

    OK or NG 

    OK: GO TO  9.

    NG: Replace EVAP canister vent control valve.

  9. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ."

    >> INSPECTION END 

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