Control Circuit Inspection

Check short to ground
1. IG "OFF" & Disconnect HO2S (B2/S2) connector.
2. Measure resistance between control terminal of HO2S (B2/S2) heater harness connector and chassis ground.
  Specification : Infinite
  
  Fig 1: Measuring Resistance Between Control Terminal Of HO2S (B2/S2) Heater Connector & Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
3. Is the measured resistance within specification?
  YES
  - Go to " 2 Check open in harness" procedure.
  NO
  - Repair short to ground in HO2S (B2/S2) heater control circuit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check open in harness
1. IG "OFF" and disconnect HO2S (B2/S2) and PCM connector.
2. Measure resistance between control terminal of HO2S (B2/S2) heater harness connector and heater control terminal of PCM harness connector.
  Specification : Approx. below 1Ω
  
  Fig 2: Measuring Resistance Between Control Terminal Of HO2S (B2/S2) Heater Connector & Heater Control Terminal Of PCM Connector
  Courtesy of KIA MOTORS AMERICA, INC.
3. Is the measured resistance within specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Repair open in HO2S (B2/S2) heater control circuit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.