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. 1 (Nernst Voltage) and Channel A negative probe to Pin No. 4 (Trim Resistor).
4. Connect Channel B positive probe to Pin No. 3 (Virtual Ground) and Channel B negative probe to Pin No. 6 (Pumping Current).
  
  Fig 1: Display - Virtual And Pumping Approx. 2000rpm, 3000rpm Fuel Cut Screen
  Courtesy of KIA MOTORS AMERICA, INC.
  
  A and B: Approx. 2000rpm and 3000rpm
  
  CH.1 - Nernst Voltage & Trim Resistor: - 0.10 ~ 1.12 V
  
  CH.2 - Pumping Current & Virtual Ground: -0.35 ~ 0.59 V
  
  C: Fuel Cut
  
  CH.1 - Nernst Voltage & Trim Resistor: 1.10 V
  
  CH.2 - Pumping Current & Virtual Ground: 0.59 V
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.