Component Inspection

Check the condition of HO2S
1. Check HO2S for poor connection or loose terminal.
2. Check if HO2S is insularly installed.
3. Is the conditions of HO2S normal?
  YES
  - Go to " 2Check 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. Engine start.
3. After warming-up, monitor signal waveform of HO2S with scantool.
  
  Fig 1: Signal Waveform Graph
  Courtesy of HYUNDAI MOTOR CO.
4. Is the sensor switching properly?
  YES
  - Go to " 3Check the 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 the fuel filter of fuel pump
1. IG "OFF" and disconnect the fuel pump connector.
2. Start the engine and wait until fuel in fuel line is exhausted. After the engine stalls, IG "OFF"
3. Remove the fuel pump assembly.
4. Check the fuel filter for clogging by dust, a foreign substance.
5. Is the fuel filter O.K.?
  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 fuel filter and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NOTE: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM. Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others