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.
  Specification: Refer to SIGNAL WAVEFORM & DATA
  
  Fig 1: Checking Signal Waveform Of HO2S
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the sensor switching properly?
  YES
  - Substitute with a known - good ECM and check for proper operation. If the problem is corrected, 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.