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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Qr25DE >> DTC P0447: EVAP Canister Vent Control Valve >> Diagnostic Procedure
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Diagnostic Procedure

  1. INSPECTION START 
    1. Do you have CONSULT-II?

    Yes or No 

    1. Yes: GO TO 2.
    2. No: GO TO  3.
  2. CHECK EVAP CANISTER VENT CONTROL VALVE CIRCUIT 

    With CONSULT-II 

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

      Clicking noise should be heard. 

      5. Fig 1: Identifying Active Test Mode Of Consult-II
      G00777972Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  7.
    2. 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 2: Identifying EVAP Canister Vent Control Valve & Components
      G00777973Courtesy 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-II or tester.

      Voltage: Battery voltage 

      5. Fig 3: Checking Voltage Between EVAP Canister Vent Control Valve Terminal 1 & Ground
      G00777974Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  5.
    2. NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F27, M59
    • Harness connectors B1, M4
    • Harness for open or short between EVAP canister vent control valve and ECM relay
      1. 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 

    1. OK: GO TO  7.
    2. NG: GO TO 6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors B3, M16
    • Harness connectors M59, F27
    • Harness for open or short between EVAP canister vent control valve and ECM
      1. 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 

    1. OK: GO TO 8.
    2. NG: Clean the rubber tube using an air blower.
  8. CHECK EVAP CANISTER VENT CONTROL VALVE 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Replace EVAP canister vent control valve.
  9. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. INSPECTION END 
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