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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 891 (Engine Control System (Diagnostic Codes & Symptom Tests)) >> DTC/Circuit Diagnosis >> DTC P0456: EVAP Control System >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. 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. Refer to REMOVAL AND INSTALLATION .

      Fig 1: Identifying Fuel Filler Cap Design
      G08690673Courtesy of NISSAN NORTH AMERICA, INC.
  2. CHECK FUEL FILLER CAP INSTALLATION 

    Check that the 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 "COMPONENT INSPECTION ".

    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 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 2: Identifying EVAP Service Port And EVAP Canister Purge Volume Control Solenoid Valve
    G08690674Courtesy of NISSAN NORTH AMERICA, INC.
    Fig 3: Installing EVAP Service Port Adapter And Pressure Pump To EVAP Service Port
    G08690675Courtesy 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:
      • Do not 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.
    4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to "DESCRIPTION ".

      OK or NG 

      OK: GO TO  8.

      NG: Repair or replace.

      Fig 4: Identifying EVAP Leak Detector
      G08690676Courtesy 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. The valve will close. (Continue to apply 12 volts until the end of test.)
      Fig 5: Identifying EVAP Canister, Vent Control Valve, EVAP Control System Pressure Sensor And Rear Suspension Member
      G08690677Courtesy of NISSAN NORTH AMERICA, INC.
    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.
      CAUTION:
      • Do not 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.
    4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to "DESCRIPTION ".

      OK or NG 

      OK: GO TO 8.

      NG: Repair or replace.

      Fig 6: Identifying EVAP Leak Detector
      G08690678Courtesy of NISSAN NORTH AMERICA, INC.
  8. CHECK EVAP CANISTER VENT CONTROL VALVE 

    Check the following.

  9. CHECK IF EVAP CANISTER SATURATED WITH WATER 
    1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached. Refer to EVAP CANISTER .
    2. Does water drain from the EVAP canister?

      Yes or No 

      Yes: GO TO 10.

      No (With CONSULT): GO TO  12.

      No (Without CONSULT): GO TO  13.

      Fig 7: Checking Water Drain From EVAP Canister
      G08690679Courtesy of NISSAN NORTH AMERICA, INC.
  10. CHECK EVAP CANISTER 

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

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

    OK or NG 

    OK (With CONSULT): GO TO  12.

    OK (Without CONSULT): GO TO  13.

    NG: GO TO 11.

  11. DETECT MALFUNCTIONING PART 

    Check the following.

  12. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION 

    With CONSULT 

    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 screen to increase "PURG VOL CONT/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  15.

      NG: GO TO  14.

  13. 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 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.

      Vacuum should exist  .

      OK or NG 

      OK: GO TO  16.

      NG: GO TO 14.

  14. CHECK VACUUM HOSE 

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

    OK or NG 

    OK: GO TO 15.

    NG: Repair or reconnect the hose.

  15. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 16.

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

  16. CHECK FUEL TANK TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 17.

    NG: Replace fuel level sensor unit. Refer to FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY .

  17. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 18.

    NG: Replace EVAP control system pressure sensor. Refer to EVAP CANISTER .

  18. 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 19.

    NG: Repair or reconnect the hose.

  19. CLEAN EVAP PURGE LINE 

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

    : GO TO 20.

  20. CHECK EVAP/ORVR LINE 

    Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper connection. For location, refer to SYMPTOM: FUEL ODOR FROM EVAP CANISTER IS STRONG. .

    OK or NG 

    OK: GO TO 21.

    NG: Repair or replace hoses and tubes. Refer to REMOVAL AND INSTALLATION .

  21. CHECK RECIRCULATION LINE 

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

    OK or NG 

    OK: GO TO 22.

    NG: Repair or replace hose, tube or filler neck tube. Refer to REMOVAL AND INSTALLATION .

  22. CHECK REFUELING EVAP VAPOR CUT VALVE 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 23.

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

  23. CHECK FUEL LEVEL SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 24.

    NG: Replace fuel level sensor unit. Refer to FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY .

  24. CHECK INTERMITTENT INCIDENT 

    Refer to "HOW TO CHECK TERMINAL " and "INTERMITTENT INCIDENT ".

    :INSPECTION END 

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