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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1179 (Engine Control System - DTCS P0181 To P0550 (VK56DE)) >> DTC P0456: EVAP Control System >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUEL FILLER CAP DESIGN
    1. Turn ignition switch OFF.
    2. Check for genuine NISSAN fuel filler cap design.

    OK or NG 

    OK: GO TO 2.

    NG: Replace with genuine NISSAN fuel filler cap.

    Fig 1: Identifying Nissan Fuel Filler Cap
    G08165119Courtesy of NISSAN NORTH AMERICA, INC.
  2. CHECK FUEL FILLER CAP INSTALLATION

    Check that the fuel filler cap is tightened properly by rotating the cap clockwise.

    OK or NG 

    OK: GO TO 3.

    NG >>

    1. Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.
    2. Retighten until ratcheting sound is heard.
  3. CHECK FUEL FILLER CAP FUNCTION

    Check for air releasing sound while opening the fuel filler cap.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 4.

  4. CHECK FUEL TANK VACUUM RELIEF VALVE

    Refer to "DESCRIPTION ".

    OK or NG 

    OK: GO TO 5.

    NG: Replace fuel filler cap with a genuine one. Refer to "REMOVAL AND INSTALLATION ".

  5. INSTALL THE PRESSURE PUMP

    To locate the EVAP leak, install EVAP service port adapter (commercial service tool) and pressure pump to EVAP service port (2) securely.

    NOTE: Improper installation of the EVAP service port adapter (commercial service tool) to the EVAP service port may cause leaking.
    • EVAP canister purge volume control solenoid valve (1)
    • : Vehicle front
    Fig 2: Identifying EVAP Canister Purge Volume Control Solenoid Valve And EVAP Service Port
    G08165120Courtesy of NISSAN NORTH AMERICA, INC.
    Fig 3: Connecting Pressure Pump To EVAP Service Port Adapter
    G08165121Courtesy of NISSAN NORTH AMERICA, INC.

    With CONSULT>>GO TO 6.

    Without CONSULT>>GO TO  7.

  6. CHECK FOR EVAP LEAK

    With CONSULT 

    1. Turn ignition switch ON.
    2. Select "EVAP SYSTEM CLOSE" of "WORK SUPPORT" mode with CONSULT.
    3. Touch "START" and apply pressure into the EVAP line until the pressure indicator reaches the middle of the bar graph.
      CAUTION:
      • Never use compressed air or a high pressure pump.
      • Never exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pressure in the system.
    4. Using EVAP leak detector (commercial service tool), locate the EVAP leak. For the leak detector (commercial service tool), refer to the instruction manual for more details.

    OK or NG 

    OK: GO TO  8.

    NG: Repair or replace malfunctioning part.

    Fig 4: Identifying EVAP Leak Detector
    G08165122Courtesy of NISSAN NORTH AMERICA, INC.
  7. CHECK FOR EVAP LEAK

    Without CONSULT 

    1. Turn ignition switch OFF.
    2. Apply 12 volts DC to EVAP canister vent control valve (3). The valve will close. (Continue to apply 12 volts until the end of test.)
      • Fuel filler pipe (top of frame view) (1)
      • EVAP control system pressure sensor (2)
      • EVAP canister (4)
      • Drain filter (5)
      • : Vehicle front
    3. Pressurize the EVAP line using pressure pump with 1.38 to 2.76 kPa (0.014 to 0.028 kg/cm2 , 0.2 to 0.4 psi), then remove pump and EVAP service port adapter (commercial service tool). Refer to "REMOVAL AND INSTALLATION ".
      Fig 5: Identifying Fuel Filler Pipe, EVAP Control System Pressure Sensor, EVAP Canister Vent Control Valve, EVAP Canister And Drain Filter
      G08165123Courtesy of NISSAN NORTH AMERICA, INC.
      CAUTION:
      • Never use compressed air or a high pressure pump.
      • Never exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pressure in the system.
    4. Using EVAP leak detector (commercial service tool), locate the EVAP leak. For the leak detector (commercial service tool), refer to the instruction manual for more details.

    OK or NG 

    OK: GO TO 8.

    NG: Repair or replace malfunctioning part.

    Fig 6: Identifying EVAP Leak Detector
    G08165124Courtesy of NISSAN NORTH AMERICA, INC.
  8. CHECK DRAIN FILTER

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 9.

    NG: Replace drain filter. Refer to EVAPORATIVE EMISSION SYSTEM .

  9. CHECK EVAP CANISTER VENT CONTROL VALVE

    Check the following.

    • EVAP canister vent control valve is installed properly.

      Refer to "COMPONENT INSPECTION ".

    • EVAP canister vent control valve.

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 10.

    NG: Repair or replace EVAP canister vent control valve and O-ring. Refer to "REMOVAL AND INSTALLATION ".

  10. CHECK IF EVAP CANISTER IS 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. Does water drain from the EVAP canister?

    Yes or No 

    Yes: GO TO 11.

    No (With CONSULT)>>GO TO  13.

    No (Without CONSULT)>>GO TO  14.

    Fig 7: Checking EVAP Canister Vent Control Valve For Water
    G08165125Courtesy of NISSAN NORTH AMERICA, INC.
  11. CHECK EVAP CANISTER

    Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached.

    SWB models: The weight should be less than 2.5 kg (5.5 lb).

    LWB models: The weight should be less than 3.2 kg (7.1 lb).

    OK or NG 

    OK (With CONSULT)>>GO TO  13.

    OK (Without CONSULT)>>GO TO  14.

    NG: GO TO 12.

  12. DETECT MALFUNCTIONING PART

    Check the following.

    • EVAP canister for damage
    • EVAP hose between EVAP canister and drain filter for clogging or poor connection

    Repair hose or replace EVAP canister. Refer to "REMOVAL AND INSTALLATION ".

  13. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

    With CONSULT 

    1. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve and EVAP service port from EVAP service port.
    2. Start engine.
    3. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode.
    4. Touch "Qu" on CONSULT screen to increase "PURG VOL C/V" opening to 100%.
    5. Check vacuum hose for vacuum when revving engine up to 2, 000 RPM.

    Vacuum should exist  .

    OK or NG 

    OK: GO TO  16.

    NG: GO TO  15.

  14. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

    Without CONSULT 

    1. Start engine and warm it up to normal operating temperature.
    2. Stop engine.
    3. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve and EVAP service port from EVAP service port.
    4. Start engine and let it idle for at least 80 seconds.
    5. Check vacuum hose for vacuum when revving engine up to 2, 000 RPM.

      Vacuum should exist  .

      OK or NG 

    OK: GO TO  17.

    NG: GO TO 15.

  15. CHECK VACUUM HOSE

    Check vacuum hoses for clogging or disconnection. Refer to "DESCRIPTION ".

    OK or NG 

    OK: GO TO 16.

    NG: Repair or reconnect the hose.

  16. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 17.

    NG: Replace EVAP canister purge volume control solenoid valve. Refer to INTAKE MANIFOLD .

  17. CHECK FUEL TANK TEMPERATURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 18.

    NG: Replace "fuel level sensor unit and fuel pump". Refer to UNIT DISASSEMBLY AND ASSEMBLY .

  18. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 19.

    NG: Replace EVAP control system pressure sensor. Refer to "REMOVAL AND INSTALLATION ".

  19. CHECK EVAP PURGE LINE

    Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection. Refer to "DESCRIPTION ".

    OK or NG 

    OK: GO TO 20.

    NG: Repair or reconnect the hose.

  20. CLEAN EVAP PURGE LINE

    Clean EVAP purge line (pipe and rubber tube) using air blower.

    GO TO 21.

  21. CHECK EVAP/ORVR LINE

    Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kinks, looseness and improper connection. For location, refer to "SYSTEM DESCRIPTION ".

    OK or NG 

    OK: GO TO 22.

    NG: Repair or replace hoses and tubes.

  22. CHECK RECIRCULATION LINE

    Check recirculation line between filler neck tube and fuel tank for clogging, kinks, cracks, looseness and improper connection.

    OK or NG 

    OK: GO TO 23.

    NG: Repair or replace hose, tube or filler neck tube.

  23. CHECK REFUELING EVAP VAPOR CUT VALVE

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 24.

    NG: Replace refueling EVAP vapor cut valve with fuel tank. Refer to "REMOVAL AND INSTALLATION ".

  24. CHECK FUEL LEVEL SENSOR

    Refer to "DIAGNOSIS PROCEDURE ".

    OK or NG 

    OK: GO TO 25.

    NG: Replace "fuel level sensor unit and fuel pump". Refer to UNIT DISASSEMBLY AND ASSEMBLY .

  25. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    >> INSPECTION END 

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