Component Inspection

Check HO2S (B1/S2) Heater resistance
1. IG "OFF" and disconnect HO2S (B1/S2) connector.
2. Measure resistance between power and control terminals of HO2S (B1/S2) heater (Component Side)
  Specification: 8.1 ~ 11.1 Ω at 21°C (69.8°F)
  
  Fig 1: Measuring Resistance Between Power And Control Terminals Of HO2S (B1/S2) Heater
  Courtesy of HYUNDAI MOTOR CO.
3. Is the measured resistance within specification?
  YES
  - Substitute with a known - good ECM and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Substitute with a known - good HO2S and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.