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Home >> Chevrolet >> 2008 >> Optra LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.6L >> Diagnostic Information and Procedures >> DTC P0030 or P0036 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate heated oxygen sensor (HO2S).
  2. Ignition ON, test for less than 0.1 volt between the ignition 1 voltage circuit terminal 2 and 12 volts.
    • If greater than the specified range, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect a test lamp between the control circuit terminal 3 and B+.
    • If test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  4. Ignition ON, test for less than 0.3 volt between the control circuit terminal 3 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the HO2S.
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