Control Circuit Inspection

■ Check short to ground
1. IG "OFF" & Disconnect HO2S (B1/S1) connector.
2. Measure resistance between control terminal of HO2S (B1/S1) heater harness connector and chassis ground.
  Specification: Infinite
  
  Fig 1: Measuring Resistance Between Control Terminal Of HO2S (B1/S1) Heater Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR AMERICA
3. Is the measured resistance within specification?
  YES
  - go to " CHECK OPEN IN HARNESS" procedure.
  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 PCM connector.
2. Measure resistance between control terminal of HO2S (B1/S1) heater harness connector and heater control terminal of PCM harness connector.
  Specification: Approx. below 1Ω
  
  Fig 2: Measuring Resistance Between Control Terminal Of HO2S (B1/S1) Heater Harness Connector And Heater Control Terminal Of PCM Harness Connector
  Courtesy of HYUNDAI MOTOR AMERICA
3. Is the measured resistance within specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Repair open in HO2S (B1/S1) heater control circuit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.