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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 57 (Engine Control System Diagnosis (2 Of 2) (HEV)) >> DTC P1455: Evaporative Emission System-Leak Detected (Large Leak) >> System Inspection

System Inspection

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

■ Fuel Filler Cap Inspection 

  1. Check fuel filler cap for being tightly installed, has o-ring seal installed and is in good condition.
  2. Verify cap releases pressure/vacuum at specified values.

    Specification:  Approx. 2 psi pressure and approximately 1.5 inches of mercury vacuum).

  3. Are cap, o-ring and release pressures okay?
    Fig 1: Identifying Gasket
    G10607040Courtesy of HYUNDAI MOTOR AMERICA

    YES 

    • Thoroughly check fuel filler pipe for cracks, damage and o-ring seat for deformation and replace as necessary. Go to next step as below.

    NO 

    • Go to next step as below.

■ Fuel Tank Pressure Sensor Inspection 

  1. Start engine.
  2. Measure FTPS output voltage between signal terminal of the FTPS harness connector and chassis ground.

    Specification: Voltage changes during wide open throttle. 

    Pressure (kPa)  -6.67 0 6.67
    FTPS output voltage  0.5 V 2.5 V 4.5 V
  3. Is voltage within the specification?

    YES 

    • Go to next step as below.

    NO 

■ PCSV Inspection 

  1. IG "OFF".
  2. Disconnect the hose leading from the PCSV to intake manifold at intake manifold.
  3. Using a vacuum pump, apply vacuum to the manifold side of the vacuum hose and verify PCSV holds vacuum.
  4. IG "ON".
  5. Install GDS and select "Canister Purge Valve" on the "Actuation Test" mode.
  6. Activates "Canister Purge Valve" by clicking "Start" icon.
  7. Verify PCSV release vacuum while valve is activating (should hear a faint click from PCSV)
  8. Repeat this procedure 4 or 5 times to ensure PCSV reliability.

    Specification: 

    Test Condition Specification
    PCSV is ON (should hear a faint click from PCSV) Holds vacuum
    PCSV is OFF Release vacuum
  9. Is PCSV working properly?

    YES 

    • Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    • Verify arrow on PCSV is pointing towards intake manifold. If it is not, reverse installation. Reinstall as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    • If OK, thoroughly check fuel vapor hoses and hose clamps between PCSV and intake manifold. Repair as necessary. If OK, test with a new PCSV and check for proper operation. If problem is corrected, replace PCSV and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ Canister Close Valve (CCV) Line Inspection 

  1. Reconnect all EVAP hardware that was previously disconnected.
  2. Disconnect hose connecting Canister Close Valve (CCV) to canister.
  3. IG "ON".
  4. Blow air to the canister side of the valve and verify air escapes to the air filter side.
  5. Install GDS and select "CANISTER CLOSE VALVE" on the "Actuation Test" mode.
  6. Blow air into hose and verify air does not escape.
  7. Repeat this procedure 4 or 5 times to ensure CCV reliability.
  8. Is CCV working properly?

    YES 

    • Go to next step as below.

    NO 

    • Check for cracks or damage in hose connecting CCV and canister. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    • If OK, replace CCV. If CCV was stuck closed, inspect all lines and canister for liquid fuel. Replace any contaminated components and blow out lines and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ PCSV to Canister Line Inspection 

  1. Check for leakage in hose
    1. Reconnect all EVAP hardware that was previously disconnected
    2. Disconnect the hose leading from the canister to the PCSV at canister
    3. Using a vacuum pump, apply specified vacuum [Approx. 4 inHg(14 kPa)] to the manifold side of the valve for 1 minute and verify PCSV holds vacuum.
    4. Is pressure within specification?

      YES 

      • Go to next step as below.

      NO 

      • Check for cracks or damage in hose connecting PCSV and canister. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  2. Check for leakage in canister
    1. Disconnect hose clamps and remove canister assembly
    2. Block the hose of between:
      • Canister and fuel filler neck
      • Canister and CCV
      • Canister and PCSV
    3. Apply maximum of 4 inHg(14 kPa) pressure through fuel tank port from canister
    4. With system sealed and pressurized, check for leaks
    5. Were any leak(s) found?

      YES 

      NO 

      • Go to next step as below.

■ Fuel Tank Line Inspection 

  1. Relieve the fuel system pressure and remove the fuel tank
    CAUTION: Before removing the fuel tank, make sure the fuel hoses are not leaking.
  2. Block all of the following outlets:
    • Fuel lines
    • Fuel filler neck
  3. Apply maximum of 10cmHg(4 inHg) pressure to the EVAP. hose at the fuel tank. Then, pinch the EVAP. hose to retain the
  4. Check the suspect area for leaks with a soap solution.
  5. Were any leak(s) found?

    YES 

    NO 

    • Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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