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Home >> Kia >> 2017 >> Optima EX >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis - 2.4L (3 Of 3) (Except HEV) >> DTC P2251-00: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) >> Wiring Inspection >> Signal Circuit Inspection

Signal Circuit Inspection

  1. Ignition "OFF".
  2. Refer to HEATED OXYGEN SENSOR (HO2S) and disconnect Upstream O2 Sensor connector.
  3. Ignition "ON"
  4. Measure voltage between Pin No. 3 (V_IP) terminal of Upstream O2 Sensor harness connector and chassis ground.
  5. Measure voltage between Pin No. 2 (V_N) terminal of Upstream O2 Sensor harness connector and chassis ground.
  6. Measure voltage between Pin No. 1 (V_G) terminal of Upstream O2 Sensor harness connector and chassis ground.
  7. Measure voltage between Pin No. 6 (V_RC) terminal of Upstream O2 Sensor harness connector and chassis ground.

    Specification:  Pin No. 3 (V_IP): 2.6V/Pin No. 2 (V_N): 2.1V/Pin No. 1 (V_G): 2.1V/Pin No. 6 (V_RC): 2.6V

  8. Re-connect Upstream O2 Sensor connector.
  9. Ignition "OFF".
  10. Connect VMI to KDS/GDS and set up an oscilloscope as follow (2-channel);

    Channel A (+): Pin No. 6 (V_RC) terminal of Upstream O2 Sensor.

    Channel A (-): Pin No. 1 (V_G) terminal of Upstream O2 Sensor.

    Channel B (+): Pin No. 3 (V_IP) terminal of Upstream O2 Sensor.

    Channel B (-): Pin No. 2 (V_N) terminal of Upstream O2 Sensor.

  11. Ignition "ON" & Engine "ON".
  12. Testing Condition: Engine Idle.

    Specification:  Refer to Fig 1 below

    Fig 1: Scantool Display - Testing Condition (Engine Idle)
    G12133074Courtesy of KIA MOTORS AMERICA, INC.
  13. Is the measured value within specification?

    YES 

    NO 

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