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Home >> Kia >> 2016 >> Optima SX Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 108 (Engine Control System Diagnosis - 1.6L (2 Of 3) - Optima (Except HEV)) >> DTC P0455: Evaporative Emission System-Leak Detected (Large Leak) >> System Inspection

System Inspection

WARNING: This page is about a different variant/trim than selected.

■ Check PCSV for leakage 

  1. Ignition Off.
  2. Disconnect the hose leading from the PCSV to the intake manifold at PCSV.
  3. Apply a vacuum at the nipple and verify that the PCSV holds vacuum.
  4. Perform "Actuation Test"  for PCSV. (should hear a faint click from PCSV)
    Fig 1: Display - Canister Purge Valve Actuation Test Screen
    G11833861Courtesy of KIA MOTORS AMERICA, INC.
  5. Vacuum should be released.
  6. Repeat this procedure 4 or 5 times to ensure PCSV reliability.
  7. Is the PCSV working properly?

    YES 

    NO 

    • Go to "Check CCV for leakage" procedure below.

■ Check CCV for leakage 

  1. Disconnect the hose leading from the CCV to Canister at CCV.
  2. Visually Check any tear of the hose leading from the CCV to Canister
  3. Connect KDS/GDS to Data Link Connector (DLC).
  4. Apply a vacuum at the nipple and verify that the CCV holds vacuum.
  5. Perform "ACTUATION TEST " for CCV.
    Fig 2: Display - Canister Shut Off Valve Actuation Test Screen (Leak Test)
    G11833862Courtesy of KIA MOTORS AMERICA, INC.
    Fig 3: Display - Canister Shut Off Valve Actuation Test Screen (Toggling)
    G11833863Courtesy of KIA MOTORS AMERICA, INC.
  6. Does CCV operates properly?

    YES 

    NO 

    • Go to "Check Canister for leakage" procedure below.

■ Check Canister for leakage 

  1. Disconnect the hose leading from the CCV to Canister at Canister.
  2. When the other nipples are plugged, apply a vacuum at the vent nipple and verify that the Canister holds vacuum.
  3. Does a leak exist?

    YES 

    NO 

    • Go to "Check Fuel Cap condition" procedure below.

■ Check Fuel Cap condition 

  1. Visually check for any damages on Fuel Cap.
  2. Check for proper installation of fuel Cap.
  3. Has any problem been found?

    YES 

    NO 

    • Go to "Check fuel tank for leakage" procedure below.

■ Check fuel tank for leakage 

  1. Check fuel tank for crack or leakage.
  2. Does a leak exist?

    YES 

    NO 

    • Carefully re-do this troubleshooting guide steps.
    • If problem still occurs, replace necessary parts and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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