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HOMESERVICE MANUALSHYUNDAI2005SANTA FE GLS, 2.7 D, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 (ENGINE CONTROL SYSTEM DIAGNOSIS (3.5L) (1 OF 2))DTC TROUBLESHOOTING PROCEDURESDTC P0140 HO2S CIRCUIT NO ACTIVITY DETECTED (BANK 1/SENSOR 2)SYSTEM INSPECTION
2005 Hyundai Santa Fe GLS, 2.7 D, AWD

System Inspection

2005 Hyundai Santa Fe GLS, 2.7 D, AWDSECTION System Inspection
WARNING: This page is about a different variant/trim than selected.
  1. Check Air Leakage
    1. Visually/physically inspect the air leakage in intake/exhaust system as following items.
      1. If OK, go to next step .
      2. If NG, repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
        • Vacuum hoses for splits, kinks and improper connections.
        • Throttle body gasket.
        • Gasket between intake manifold and cylinder head.
        • Seals between intake manifold and fuel injectors.
        • Exhaust system between HO2S and Three way catalyst for air leakage.
    2. Check for air leakage in EVAP Purge control valve.
      1. With engine idling disconnect hose from EVAP purge valve side of hose.
      2. Check no vacuum at EVAP purge solenoid valve.
      3. Is vacuum available at purge valve when EVAP purge valve is not in operating?

        YES 

        NO 

        • Go to next step .
    3. Check for air leakage in Positive Crankcase Ventilation Valve (PCV).
      1. Remove PCV valve from cylinder head cover by pulling ventilation hose.
      2. With engine idling block PCV valve opening.
      3. Confirm that vacuum is felt.
      4. Remove PCV valve.
      5. Blow through valve from port "A" and verify that air comes out of port "B"
      6. Blow through valve from port "B" and verify that no air comes out of port "A"
      7. Has a problem been found?

        YES 

        NO 

        • Go to next step .
  2. Fuel System
    1. Fuel Pump Test
      1. Connect Scan tool & Ignition "ON"
      2. Perform Actuation Test for Fuel Pump with scan tool
      3. Check that Fuel Pump operating sound can be heard.
        Fig 1: Scan Tool Simulation Function
        G03845508Courtesy of HYUNDAI MOTOR CO.
      4. Does the Fuel Pump operates correctly?

        YES 

        • Go to next step .

        NO 

        • Substitute with a known-good Fuel Pump and check for proper operation. If the problem is corrected, replace HO2S and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  3. Fuel Pressure Test
    NOTE:
    1. Be cautious that Fuel is explosive and an empty fuel tank can still contain explosive gases. When working on fuel system make sure to supply adequate ventilation to the work area. Do not smoke, and keep sparks and open flames away.
    2. The fuel system remains under pressure when the engine is not running. Release fuel system pressure before disconnecting any fuel line to reduce the chance of personal injury or fire damage to vehicle components.
    1. Check the fuel for excessive water, alcohol, or other contaminants. Replace contaminated fuel as necessary.
    2. Install the fuel pressure gauge to the fuel pressure gauge adaptor.
    3. Apply battery voltage to the terminal for the pump drive and activate the fuel pump: then, with fuel pressure applied, check that there is no fuel leakage from the pressure gauge or connection part.
    4. Disconnect the vacuum hose from the pressure regulator, and plug the hose end. Measure the fuel pressure at idle.

      Specification : 320~340kPa (3.26~3.47 kg/cm2 , 46~49 psi)

    5. Measure the fuel pressure when the vacuum hose is connected to the pressure regulator.

      Specification : Approx. 255kPa (2.57 kg/cm2 , 37 psi)

    6. Are the measured fuel pressures within specifications?

      YES 

      • Go to next step .

      NO 

    FUEL PRESSURE SPECIFICATIONS

    Condition Possible Cause
    Fuel Pressure is too low Fuel filter, fuel pressure regulator, in-tank fuel hose or the fuel pump
    Fuel Pressure is too high Fuel pressure regulator, hose or pipe
    No different fuel pressure when vacuum hose is connected or not The vacuum hose or the nipple
  4. Check Injector Leakage
    1. Ignition "OFF" after checking the Fuel Pressure Test.
    2. Stop the engine and check for a change in the fuel pressure gauge reading for 5 minutes.
    3. Does fuel pressure drop after engine is stopped?

      YES 

      NO 

    FUEL PRESSURE SPECIFICATIONS

    Condition Possible Cause
    Fuel Pressure reading drops slowly after engine is stopped Injector leakage
    Fuel Pressure reading drops immediately after engine is stopped Fuel pump
RENDER: 1.0x

NO RELATED

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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.