Component Inspection

Visual Check HO2S (S1)
1. IG "OFF" and disconnect HO2S (S1) connector.
2. Check that HO2S (S1) is contaminated or damaged by foreign materials.
Check HO2S (S1) performance
1. Warm up the engine to normal operating temperature.
2. Connect VMI to GDS and select "Oscilloscope".
3. Connect Channel A positive probe to Pin No. 6 (Pumping Current) and Channel A negative probe to Pin No. 4 (Trim Resistor).
4. Connect Channel B positive probe to Pin No. 1 (Nernst Voltage) and Channel B negative probe to Pin No. 3 (Virtual Ground).
  
  Fig 1: O2 Sensor Waveforms - 2000 RPM & Fuel Cut
  Courtesy of KIA MOTORS AMERICA, INC.
  1. Approx. 2000rpm
    CH.1 - Pumping Current & Virtual Ground: - 0.5 ~ 0.4 V
    
    CH.2 - Nernst Voltage & Trim Resistor: -1.0 ~ -0.0 V
  2. Fuel Cut
    CH.1 - Pumping Current & Virtual Ground: Approx. 0.89V
    
    CH.2 - Nernst Voltage & Trim Resistor: Approx. 0.64V
Confirm Part Inspection
1. Does the HO2S (S1) operate properly? (Check variation)
  YES
  - Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Carefully re-do this troubleshooting guide steps.
  - If problem still occurs, replace HO2S (S1) and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.