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
  - Go to "Check fuel filter" as follows:
  NO
  - Substitute with a known - good HO2S and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check fuel filter
1. IG OFF.
2. Disconnect fuel pump connector.
3. Start the engine, wait until fuel in fuel line is used up. IG OFF after engine stops.
4. Disassemble fuel pump assembly.
5. Check for fuel filter stuck on dust or foreign object.
6. Is the fuel filter OK.?
  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 fuel filter and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.