Component Inspection

■ Check the condition of HO2S
1. Check HO2S for poor connection or loose terminal.
2. Check if HO2S is installed properly.
3. Is the conditions of HO2S normal?
  YES
  - Go to " 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" and connect HO2S connector.
2. Start Engine
3. With engine at operating temperature, monitor signal waveform of HO2S with GDS.
  
  Fig 1: Monitoring Signal Waveform Of HO2S
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 2: Screen Display - Normal Waveforms Of Upstream HO2S (Upper) And Downstream HO2S (Lower) (Chassis Ground)
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 3: Screen Display - Normal Waveforms Of Upstream HO2S (Upper) And Downstream HO2S (Lower) (Sensor Ground)
  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.