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 "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: Screen Display - Normal Waveforms Of Front HO2S (Upper) And Rear HO2S (Lower) (Chassis Ground)

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 2: Screen Display - Normal Waveforms Of Front HO2S (Upper) And Rear 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.