Component Inspection

Inspection Condition	(+) Probe		(-) Probe		Reference
Inspection Condition	Connector	Terminal	Connector	Terminal	Reference
Engine "ON" (Warm up condition)	HO2S (B1/S1) harness connector	1 (Nernst Voltage)	HO2S (B1/S1) harness connector	6 (Pumping Current)	Figure below.
Engine "ON" (Warm up condition)	HO2S (B1/S1) harness connector	3 (Virtual ground)	HO2S (B1/S1) harness connector	4 (Trim Resistor)	Figure below.

Courtesy of KIA MOTORS AMERICA, INC.

Good

No Good

Carefully re-do this troubleshooting guide steps.
If no problems were found with the circuits or connectors, replace the HO2S (B1/S1) and go to "VERIFICATION OF REPAIR " procedure.