Signal Circuit Inspection

Check for short to chassis ground in harness
1. Ignition "OFF"
2. Disconnect HO2S sensor connector and PCM connector.
3. Ignition "ON" & Engine "OFF"
4. Measure resistance between terminal 2 of sensor harness connector and chassis ground.
  Specification: infinite
  
  Fig 1: Measuring Resistance Between Terminal 2 Of Sensor Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
5. Is measure resistance within Specification?
  YES
  - Go to "Check for short to ground in harness" below.
  NO
  - Short circuit between HO2S signal circuit and chassis ground.
  - Short to chassis ground between PCM harness connector and HO2S harness connector.
  - Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect HO2S sensor connector and PCM connector.
3. Ignition "ON" & Engine "OFF"
4. Measure resistance between terminal 1, 2 of sensor harness connector.
  Specification: infinite
  
  Fig 2: Measuring Resistance Between Terminals 1 & 2 Of Sensor Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
5. Is measure resistance within Specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Short circuit between HO2S signal circuit and ground circuit.
  - Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.