Control Circuit Inspection

■ Check short to ground 

1. IG "OFF" & Disconnect HO2S (B1/S2) connector.
2. Measure resistance between control terminal of HO2S (B1/S2) heater harness connector and chassis ground.

   Specification:  Infinite

   Fig 1: Measuring Resistance Between Control Terminal Of HO2S(B1/S2) Heater Harness Connector And Chassis Ground

   Courtesy of HYUNDAI MOTOR AMERICA
3. Is the measured resistance within specification?

   YES 

   • Go to "Component Inspection  " procedure below.

   NO 

   • Repair short to ground in HO2S (B1/S2) heater control circuit and go to "Verification of Vehicle Repair " procedure.

■ Check open in harness 

1. IG "OFF" and disconnect HO2S (B1/S2) and PCM connector.
2. Measure resistance between control terminal of HO2S (B1/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(B1/S2) 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 below.

   NO 

   • Repair open in HO2S (B1/S2) heater control circuit and go to "Verification of Vehicle Repair " procedure.