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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 125 (Engine Control System Diagnosis (1 Of 2) (HEV)) >> DTC P0451: Evaporative Emission System-Pressure Sensor Range/Performance >> 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
    G10606696Courtesy 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.

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