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Home >> Kia >> 2010 >> Optima EX, 2.4 8 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 2) - 2.4L >> DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control >> Scan Tool Diagnostics >> Monitor scan tool Data
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Monitor scan tool Data

  1. Allow the engine to cool completely
  2. Run the cold engine at idle for 5 minutes and observe cooling fan status.
    NOTE: Ensure that the A/C is OFF
  3. Check the engine coolant temperature parameter at idle with the scan tool.
  4. Is the engine coolant temperature increase to above 50°C (122°F)

    YES 

    NO 

    • Go to next step.
  5. Are the cooling fans running when engine coolant temperature is low (less than approximately 98°C (208°F)) with A/C OFF?

    YES 

    NO 

      • With ignition "ON", Install scan tool and select "COOLING FAN RELAY" on the Actuation Test mode.
      • Activates "COOLING FAN RELAY" by click "Start" button.
      • Repeat this procedure 4 or 5 times to ensure cooling fan reliability.
      • If cooling fan works properly, go to next step.
      • If NG, check for intermittent fault caused by poor contact in the sensor's and/or PCM's connector.

        Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.