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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 P0136: O2 Sensor Circuit (Bank 1 Sensor 2) >> Wiring Inspection >> Signal Circuit Inspection

Signal Circuit Inspection

WARNING: This page is about a different variant/trim than selected.

■ Check resistance 

  1. IG "OFF". Disconnect HO2S connector.
  2. Measure resistance between both ends of signal terminal of HO2S (B1/S1) harness.

    Specification:  Approx. 0 Ω.

  3. Is voltage within the specification?

    YES 

    • Go to next step below

    NO 

    • Repair or replace 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.

■ Check voltage 

  1. IG "OFF". Disconnect HO2S connector.
  2. IG "ON"
  3. Measure voltage between signal terminal of HO2S (B1S2) harness connector and chassis ground

    Specification:  Approx. 2~3 V

  4. Is voltage within the specification?

    YES 

    • Go to "ground circuit inspection" procedure below.

    NO 

    • Repair or replace 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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