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Home >> Kia >> 2016 >> Optima EX >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis - 2.4L (3 Of 3) - Optima (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 below

    Fig 1: Screen Display - Upstream O2 Sensor
    G11839080Courtesy of KIA MOTORS AMERICA, INC.
  13. Is the measured value within specification?

    YES 

    NO 

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