Control Circuit Inspection

Check short to ground in harness.
1. IG "OFF" and disconnect HO2S(B1/S1) connector.
2. Measure resistance between terminal 2 of HO2S(B1/S1) harness connector and chassis ground.
  Specification: Infinite
  
  Fig 1: Measuring Resistance Between Terminal 2 Of HO2S(B1/S1) Harness Connector And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
3. Is the measured resistance within specification?
  YES
  - Go to step 2.
  NO
  - Repair short to ground in HO2S (B1/S1) heater control circuit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check open in harness
1. IG "OFF" and disconnect HO2S(B1/S1) and ECM connector.
2. Measure resistance between terminal 2 of HO2S(B1/S1) harness connector and terminal 49 of ECM harness connector (C144-B).
  Specification: Prix. below 1Ω
  
  Fig 2: Measuring Resistance Between Terminal 2 Of HO2S(B1/S1) Harness Connector And Terminal 49 Of ECM Harness Connector (C144-B)
  Courtesy of KIA MOTORS AMERICA, INC.
3. Is the measured resistance within specification?
  YES
  - Go to HO2S(B1/S1) "Component Inspection" procedure.
  NO
  - Repair open in HO2S(B1/S1) heater control circuit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.