Signal Circuit Inspection

Check for open in harness (signal)
1. Ignition "OFF"
2. Disconnect HO2S sensor connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between terminal 2 of sensor harness connector and chassis ground.
  Specification: approximately 0.45V
  
  Fig 1: Measuring Voltage Between Terminal 2 Of Sensor Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
5. Is measure voltage within Specification?
  YES
  - Go to "Check for open in harness (ground)" below.
  NO
  - Open circuit between HO2S harness connector and ECM harness connector.
  - Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for open in harness (ground)
1. Ignition "OFF"
2. Disconnect HO2S sensor connector and PCM connector.
3. Ignition "ON" & Engine "OFF"
4. Measure resistance between terminal 1 of sensor harness connector and ECM harness connector.
  Specification: below 1Ω
  
  Fig 2: Measuring Resistance Between Terminal 1 Of Sensor Harness Connector And ECM Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
5. Is measure resistance within Specification?
  YES
  - Go to "Check for short to ground in harness" below
  NO
  - Open circuit between HO2S harness connector and PCM 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 and 2 of sensor harness connector.
  Specification: infinite
  
  Fig 3: Measuring Resistance Between Terminal 1 And 2 Of Sensor Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
5. Is measure resistance within Specification?
  YES
  - Go to "Check for short to chassis ground in harness" below.
  NO
  - Short circuit between HO2S signal circuit and ground circuit.
  - Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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 4: 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 "COMPONENT INSPECTION " procedure.
  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.