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Home >> Hyundai >> 2003 >> Santa Fe Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3.5L) (1 Of 2) >> Troubleshooting For DTC >> DTC P0175: System Too Rich (Bank 2) >> Inspection/Repair >> System Inspection

System Inspection

  1. Check Air Cleaner Restrictions.
    1. Visually/physically inspect the air Cleaner restrictions.
      1. If OK, go to " 2 Fuel Pressure Test" as below.
      2. If NG, repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  2. 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: 314~343 kPa (3.20~3.50 kg/cm2 , 45.5~50 psi)

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

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

    6. Are the measured fuel pressure within specifications?

      YES

      • Go to " 3 Check injector clog" as below.

      NO

      • Repair or replace according to the below table. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
        FUEL PRESSURE TESTING CONDITIONS CHART

        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
  3. 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

      • 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.

      NO

      • Repair or replace according to the below table. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
        INJECTOR LEAKAGE CHECKING CONDITIONS CHART

        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
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