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Component Inspection

  1. Visual Inspection.
    1. IG "OFF"
    2. Disconnect HO2S (B1/S2) connector.
    3. Check that HO2S (B1S2) is contaminated or damaged by foreign materials.
    4. Has a problem been found?

      YES  : --> Go to "Check ECM/PCM" as follows.

      NO  : --> Substitute with a known - good HO2S (B1/S2) and check for proper operation.

      --> If the problem is corrected, replace HO2S (B1/S2) and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

  2. Check ECM/PCM.
    1. IG "OFF".
    2. Connect scantool and Engine "ON".
    3. Select simulation function on scantool.
    4. Simulate voltage at terminal 2 of HO2S (B1/S2) signal connector.
      Fig 1: Scantool Display - Simulation Of Voltage At Terminal 2 Of HO2S
      G04801869Courtesy of HYUNDAI MOTOR CO.
    5. Does the signal value of HO2S (B1/S2) change according to simulation voltage?

      YES  : --> 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  : --> Substitute with a known - good ECM/PCM and check for proper operation.

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

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