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Home >> Hyundai >> 2017 >> Sonata Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 32 (Engine Control System Diagnosis - 2.0L (1 Of 3) (Except HEV)) >> DTC P0135: O2 Sensor Heater Circuit (Bank 1 Sensor 1) >> Wiring Inspection >> Power Circuit Inspection

Power Circuit Inspection

WARNING: This page is about a different variant/trim than selected.
  1. IG "OFF".
  2. Disconnect HO2S connector.
  3. IG "ON" & Engine "OFF".
  4. Measure voltage between Heater Power terminal 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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