Check HO2S (S1) performance

1. Warm up the engine to normal operating temperature.
2. Connect VMI to KDS 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 (Nearmost Voltage) and Channel B negative probe to Pin No. 3 (Virtual Ground).

Courtesy of KIA MOTORS AMERICA, INC.

1. A: Approx. 2000rpm

   CH.1 - Pumping Current & Virtual Ground: - 0.5 to 0.4 V

   CH.2 - Nearmost Voltage & Trim Resistor: -1.0 to -0.0 V

2. B: Fuel Cut

CH.1 - Pumping Current & Virtual Ground: Approx. 0.89V

CH.2 - Nearmost Voltage & Trim Resistor: Approx. 0.64V