Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSHYUNDAI2003XG350 LREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM DIAGNOSIS (2 OF 2)DIAGNOSTIC TESTSDTC P0455: EVAP EMISSION SYSTEM - LEAK DETECTED (LARGE LEAK)INSPECTION/REPAIRCOMPONENT INSPECTION

2003 Hyundai XG350 L

Component Inspection

2003 Hyundai XG350 LSECTION Component Inspection

Check PCSV for leakage.
1. Disconnect the hose leading from the PCSV to the intake manifold at PCSV.
2. Apply a vacuum at the nipple and verify that the PCSV holds vacuum.
3. Does a leak exist?
  YES
  - Repair or replace as necessary and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Go to 2 "Check CCV for leakage" as 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. When the CCV operates, apply a vacuum at the nipple and verify that the CCV holds vacuum.
4. Does a leak exist?
  YES
  - Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Go to 3 "Check Canister for leakage" as necessary.
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
  - Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Go to 4 "Check fuel tank for leakage" as below.
Check fuel tank for leakage.
1. Check fuel tank for crack or leakage.
2. Does a leak exist?
  YES
  - Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Substitute with a known - good PCM and check for proper operation.
  - If the problem is corrected, replace PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.