Component Inspection

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 GDS.
  
  Fig 1: Measuring HO2S Signal Waveform
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 2: Upstream And Downstream HO2S Normal Waveforms (Chassis Ground Used)
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 3: Upstream And Downstream HO2S Normal Waveforms (Sensor Ground Used)
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the sensor switching properly?
  YES
  - Check HO2S for poor connection/installation or damage. If O.K., 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.