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Home >> Kia >> 2016 >> Optima Hybrid >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 3) (HEV) >> DTC P0135: O2 Sensor Heater Circuit(Bank 1/Sensor 1) >> Wiring Inspection >> Power Circuit Inspection
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Power Circuit Inspection

  1. Ignition "OFF".
  2. Disconnect HO2S connector.
  3. Ignition "ON" & Engine "OFF"
  4. Measure voltage between Heater Power terminal (Pin No. 4) of the HO2S harness connector and chassis ground.

    Specification:  B+

  5. Is voltage display near the specified value?

    YES 

    • Go to Control Circuit Inspection procedure below.

    NO 

    • Check for open or short in the power supply circuit between the main relay and the HO2S. Especially check for "15A Sensor 2 fuse" is installed and not blown. Repair as necessary and go to "Verification Of Vehicle Repair " procedure.
      NOTE: HO2S must have a clean air reference to function properly. The air is obtained by way of the sensor wire(s). Do not attempt to repair the wire(s), connector, or the terminals.
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