Component Inspection

■ Check the condition of HO2S 

1. Check HO2S for poor connection or loose terminal.
2. Check if HO2S is ensurely 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 below.

■ 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: Checking Signal Waveform Of HO2S

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 2: Screen Display - Normal Waveforms Of Upstream HO2S (Upper) And Downstream HO2S (Lower) (Chassis Ground)

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 3: Screen Display - Normal Waveforms Of Upstream HO2S (Upper) And Downstream HO2S (Lower) (Sensor Ground)

   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 below.

■ 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 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 below.

   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 below.