Component Inspection

Check the condition of HO2S
1. Check HO2S for poor connection or loose terminal.
2. Check if HO2S is securely installed.
3. Are the conditions of HO2S normal?
  YES
  - Go to step 2.
  NO
  - Repair it and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check the Signal waveform of HO2S
1. IG "OFF" and connect HO2S connector.
2. Engine start.
3. After warming-up, monitor signal waveform of HO2S with scan tool.
  
  Fig 1: Identifying Signal Waveform
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the sensor switching properly?
  YES
  - Check fuel filter.
  NO
  - Substitute with a known-good HO2S and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NOTE: There is a memory reset function on scan tool that can erase optional parts automatically detected and memorized by ECM. Before or after testing ECM on the vehicle, use this function before reusing the ECM