Inspection Procedures

1. CHECK HO2S AND ECM CONNECTORS
   1. Check HO2S and ECM for poor connection, misplaced, bent, loose or corroded terminals.

   Are both connectors good? 

   Yes: Go to next

   No: Repair or replace it.

2. CHECK HO2S HEATER RESISTANCE
   1. Turn ignition switch to OFF position and disconnect HO2S connector.
   2. Measure resistance between terminals 3 and 4 of the HO2S connector.
   Fig 1: Measuring Resistance Between Terminals 3 & 4 Of HO2S Connector

   Courtesy of HYUNDAI MOTOR CO.
   • 9ohm at 20°C ~ 24°C(68°F ~ 75.2°F)

   Is resistance within specification? 

   Yes: Go to next

   No: Replace HO2S.

3. VISUALLY CHECK HO2S FOR CONDITIONS
   1. Remove HO2S.
   2. Thoroughly check HO2S for contamination, deterioration or damage.

Is HO2S contaminated, deteriorated or damaged? 

Yes: Clean or replace HO2S.

Yes: Proceed with ECM PROBLEM PROCEDURE  .