Component Inspection

Check the condition of HO2S
1. Check HO2S for poor connection or loose terminal.
2. Check if HO2S is securely installed.
3. Is HO2S in good condition?
  YES
  - Go to " 2 Check the Signal waveform of HO2S" as follows.
  NO
  - Repair it and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check the Signal waveform of HO2S
1. IG "OFF". Connect HO2S connector.
2. Engine start.
3. With engine at operating temperature, monitor signal waveform of HO2S with GDS.
  
  Fig 1: Display - Normal Waveforms Of Front HO2S (Upper) And Rear HO2S (Lower) - Chassis Ground Used
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 2: Display - Normal Waveforms Of Front HO2S (Upper) And Rear HO2S (Lower) - Sensor Ground Used
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the sensor switching properly?
  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, go to "VERIFICATION OF VEHICLE REPAIR " procedure.