Check The Signal Waveform Of HO2S

Ignition switch is turned "OFF". Connect HO2S connector.
Connect probe to HO2S to measure signal waveform using oscilloscope function. Start engine.
After warming-up, monitor signal waveform of HO2S with GDS.

Courtesy of HYUNDAI MOTOR AMERICA
Is the sensor switching properly?
YES
- Substitute with a known-good ECM and check for proper operation. If the problem is corrected, replace ECM 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.