2011 Kia Rio BaseFACTORY OEM SERVICE PROCEDURE

Component Inspection

  1. Visual Inspection
    1. IG "OFF"
    2. Disconnect HO2S (B1/S1) connector.
    3. Check that HO2S (B1S1) is contaminated or damaged by foreign materials.
    4. Has a problem been found?

      YES

      1. Go to " 2 Check HO2S (B1/S1) performance" as follows.

      NO

      1. Substitute with a known - good HO2S (B1/S1) and check for proper operation.

        If the problem is corrected, replace HO2S (B1/S1) and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

  2. Check HO2S (B1/S1) performance
    1. IG "OFF".
    2. Connect probe to terminal 2 of HO2S (B1/S1) connector and select oscilloscope function with scantool.
    3. Warm up the engine to normal operating temperature.
    4. Measure signal waveform of HO2S (B1/S1) with scantool
      Fig 1: Heated Oxygen Sensor - Signal Waveform
      G06830555Courtesy of KIA MOTORS AMERICA, INC.
    5. Is the measured signal waveform within specification?

      YES

      1. Go to " 3 Check ECM" as follows.

      NO

      1. Substitute with a known - good HO2S (B1/S1) and check for proper operation.

        If the problem is corrected, replace HO2S (B1/S1) and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

  3. Check ECM
    1. IG "OFF" and disconnect B1S1 connector.
    2. Connect scantool and Key "ON".
    3. Select simulation function on scantool.
    4. Simulate voltage at terminal 2 of HO2S (B1/S1) signal connector.
      Fig 2: Scantool Display - Oxygen Sensor (B1/S1)
      G06830556Courtesy of KIA MOTORS AMERICA, INC.
    5. Does the signal value of HO2S (B1/S1) change according to simulation voltage?

      YES

      1. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

      NO

      1. Substitute with a known - good ECM and check for proper operation.

        If the problem is corrected, replace ECM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

        CAUTION: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM.
        Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others
Factory Service Tools

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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.

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