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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 P0172: SYSTEM TOO RICH (BANK 1)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 Cleaner Restrictions.
    1. Visually/physically inspect the air Cleaner restrictions.
      1. If OK, go to next step .
      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 : 314~343kPa (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. 255kPa (2.57 kg/cm2 , 37 psi)

    6. Are the measured fuel pressures within specifications?

      Yes 

      • Go to next step .

      NO 

      FUEL PRESSURE SPECIFICATIONS 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 

FUEL PRESSURE GAUGE READINGS 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
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.