Component Inspection

Check Heater resistance
1. Ignition "OFF"
2. Disconnect HO2S connector
3. Measure resistance between terminals 3 and 4 of the sensor connector(To HO2 sensor side).
  Specification: 7 ~ 40Ω [at 20°C(68°F)]
  
  Fig 1: Measuring Resistance Between Terminals 3 And 4 Of Sensor Connector
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured HO2S heater resistance within specifications ?
  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
  - Substitute with a known - good HO2S and check for proper operation.
    If the problem is corrected, replace HO2S and go to "VERIFICATION OF VEHICLE REPAIR " procedure.