Component Inspection

1. Check HO2S for poor connection or loose terminal.
2. Check if HO2S is securely installed.
3. Are the conditions of HO2S normal?

   YES 

   • Go to step  2.

   NO 

   • Repair it and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

1. IG "OFF" and connect HO2S connector.
2. Engine start.
3. After warming-up, monitor signal waveform of HO2S with scan tool.
   Fig 1: Identifying Signal Waveform

   Courtesy of KIA MOTORS AMERICA, INC.
4. Is the sensor switching properly?

   YES 

   • Go to step  3.

   NO 

   • Substitute with a known-good HO2S and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.

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 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 fuel filter and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.