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Home >> Nissan-Datsun >> 2004 >> Sentra Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - QG18DE >> DTC P0455: EVAP Control System >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK FUEL FILLER CAP DESIGN 
    1. Turn ignition switch OFF.
    2. Check for genuine NISSAN fuel filler cap design.

    OK or NG 

    1. OK: GO TO 2.
    2. NG: Replace with genuine NISSAN fuel filler cap.
    Fig 1: Identifying NISSAN Fuel Filler Cap
    G00773686Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK FUEL FILLER CAP INSTALLATION 

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

    OK or NG 

    1. OK: GO TO 3.
    2. 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 

    1. OK: GO TO  5.
    2. NG: GO TO 4.
  4. CHECK FUEL TANK VACUUM RELIEF VALVE 
    1. Wipe clean valve housing.
    2. Check valve opening pressure and vacuum.
      1. Pressure: 15.3 - 20.0 kPa (0.156 - 0.204 kg/cm 2 , 2.22 - 2.90 psi) 
      2. Vacuum: -6.0 to -3.3 kPa (-0.061 to -0.034 kg/cm 2 , -0.87 to -0.48 psi) 
      CAUTION: Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may come on.
      Fig 2: Sectional View Of Fuel Tank Vacuum Relief Valve
      G00773687Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: Checking Valve Opening Pressure And Vacuum
      G00773688Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Replace fuel filler cap with a genuine one.
  5. CHECK EVAP PURGE LINE 

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

    Refer to EVAPORATIVE EMISSION SYSTEM .

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Repair or reconnect the hose.
  6. CLEAN EVAP PURGE LINE 

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

    1. GO TO 7.
  7. CHECK EVAP CANISTER VENT CONTROL VALVE 

    Check the following.

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Repair or replace EVAP canister vent control valve and O-ring.
  8. INSTALL THE PRESSURE PUMP 

    To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port securely.

    NOTE: Improper installation of the EVAP service port adapter to the EVAP service port may cause leaking.
    Fig 4: Identifying EVAP Service Port
    G00773689Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 5: Installing EVAP Service Port Adapter And Pressure Pump To EVAP Service Port
    G00773690Courtesy of NISSAN MOTOR CO., U.S.A.

    Models with CONSULT-II: GO TO  15.

    Models without CONSULT-II: GO TO  10.

  9. CHECK FOR EVAP LEAK 

    With CONSULT-II 

    1. Turn ignition switch ON.
    2. Select "EVAP SYSTEM CLOSE" of "WORK SUPPORT" mode with CONSULT-II.
    3. Touch "START" and apply pressure into the EVAP line until the pressure indicator reaches the middle of the bar graph.
      NOTE:
      • Never use compressed air or a high pressure pump.
      • Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pressure in the system.
      Fig 6: Displaying EVAP SYSTEM CLOSE Mode
      G00773691Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Using EVAP leak detector, locate the EVAP leak.

      Refer to EVAPORATIVE EMISSION LINE DRAWING .

    OK or NG 

    1. OK: GO TO  11.
    2. NG: Repair or replace.
    Fig 7: Locating EVAP Leak Using EVAP Leak Detector
    G00773692Courtesy of NISSAN MOTOR CO., U.S.A.
  10. CHECK FOR EVAP LEAK 

    Without CONSULT-II 

    1. Turn ignition switch OFF.
    2. Apply 12 volts DC to EVAP canister vent control valve. The valve will close. (Continue to apply 12 volts until the end of test.)
    3. Pressurize the EVAP line using pressure pump with 1.3 to 2.7 kPa (10 to 20 mmHg, 0.39 to 0.79 inHg), then remove pump and EVAP service port adapter.
      NOTE:
      • Never use compressed air or a high pressure pump.
      • Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pressure in the system.
      Fig 8: Identifying EVAP Control System Pressure Sensor And Control Valve
      G00773693Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Using EVAP leak detector, locate the EVAP leak. Refer to EVAPORATIVE EMISSION LINE DRAWING .

    OK or NG 

    1. OK: GO TO  12.
    2. NG: Repair or replace.
    Fig 9: Locating EVAP Leak Using EVAP Leak Detector
    G00773694Courtesy of NISSAN MOTOR CO., U.S.A.
  11. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION 

    With CONSULT-II 

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

    OK or NG 

    1. OK: GO TO  14.
    2. NG: GO TO  13.
    Fig 10: Displaying ACTIVE TEST Mode
    G00773695Courtesy of NISSAN MOTOR CO., U.S.A.
  12. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION 

    Without CONSULT-II 

    1. Start engine and warm it up to normal operating temperature.
    2. Stop engine.
    3. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at 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.
      1. Vacuum should exist. 

    OK or NG 

    1. OK: GO TO  15.
    2. NG: GO TO 13.
  13. CHECK VACUUM HOSE 

    Check vacuum hoses for clogging or disconnection. Refer to EVAPORATIVE EMISSION LINE DRAWING .

    OK or NG 

    1. OK (With CONSULT-II): GO TO 14.
    2. OK (Without CONSULT-II): GO TO  15.
    3. NG: Repair or reconnect the hose.
  14. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE 

    With CONSULT-II 

    1. Start engine.
    2. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode with CONSULT-II. Check that engine speed varies according to the valve opening.

    OK or NG 

    1. OK: GO TO  16.
    2. NG: GO TO 15.
    Fig 11: Displaying PURG VOL CONT/V In ACTIVE TEST Mode
    G00773696Courtesy of NISSAN MOTOR CO., U.S.A.
  15. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE 

    Refer to COMPONENT INSPECTION .

    OK or NG 

    1. OK: GO TO 16.
    2. NG: Replace EVAP canister purge volume control solenoid valve.
  16. CHECK FUEL TANK TEMPERATURE SENSOR 

    Refer to COMPONENT INSPECTION .

    OK or NG 

    1. OK: GO TO 17.
    2. NG: Replace fuel level sensor unit.
  17. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to COMPONENT INSPECTION .

    OK or NG 

    1. OK: GO TO 18.
    2. NG: Replace EVAP control system pressure sensor.
  18. CHECK EVAP/ORVR VAPOR LINE 

    Check refueling EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper connection. For location, refer to ON BOARD REFUELING VAPOR RECOVERY (ORVR) .

    OK or NG 

    1. OK: GO TO 19.
    2. Repair or replace hoses and tubes.
  19. CHECK SIGNAL LINE AND RECIRCULATION LINE 

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

    OK or NG 

    1. OK: GO TO 20.
    2. Repair or replace hoses, tubes or filler neck tube.
  20. CHECK REFUELING EVAP VAPOR CUT VALVE 

    Refer to COMPONENT INSPECTION .

    OK or NG 

    1. OK: GO TO 21.
    2. Replace refueling EVAP vapor cut valve with fuel tank.
  21. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    1. INSPECTION END 
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