LEMON Manuals: Even more car manuals for everyone
Home >> Kia >> 2019 >> Optima EX >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (5 Of 6) (PHEV) >> DTC P2271-00: O2 Sensor Signal Stuck Rich (Bank 1 Sensor 2) >> Wiring Inspection >> Ground Circuit Inspection

Ground Circuit Inspection

  1. Ignition "OFF".
  2. Disconnect Battery (-) terminal.
  3. Refer to HEATED OXYGEN SENSOR (HO2S)8 "service information" and disconnect Downstream O2 Sensor connector.
  4. Measure resistance between Pin No. 2 (Ground) terminal of Downstream O2 Sensor harness connector and chassis ground.

    Specification:  Approx. below 1Ω

  5. Is the measured value within specification?

    YES 

    NO 

    • Repair open or short in ground circuit between Downstream O2 Sensor and ECM/PCM and then go to "VERIFICATION OF REPAIR " procedure.
scientia non olet · About LEMON Manuals