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 the conditions of HO2S normal?
  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" and connect HO2S connector.
2. Start Engine
3. With engine at operating temperature, monitor signal waveform of HO2S with GDS.
  
  Fig 1: Display - Normal Waveform Of Front HO2S And Rear HO2S At Idle Screen
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the sensor switching properly?
  YES
  - Go to "Check fuel filter", refer to "CHECK THE FUEL FILTER OF FUEL PUMP " 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 empty. After the engine stalls, IG "OFF"
3. Remove the fuel pump assembly.
4. Check the fuel filter for restrictions or foreign substances.
5. Is the fuel filter OK?
  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.