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Home >> Chevrolet >> 2007 >> Optra LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.8L (LDA) >> Diagnostic Information and Procedures >> DTC P0131 or P0132 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the HO2S 1.
  2. Ignition ON, verify that the HO2S 1 parameter is between 350-500 mV.
    • If less than 350 mV, test the signal circuit of the HO2S for a short to ground. If the circuit/connections test normal, replace the engine control module (ECM).
    • If greater than 500 mV, test the signal circuit of the HO2S for a short to voltage. If the circuit/connections test normal, replace the ECM.
  3. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit of the HO2S sensor and ground.
    • If greater than 5 ohms, test the low reference circuit of the HO2S sensor for an open/high resistance. If the circuit/connections test normal, replace the ECM.
  4. Install a 3-amp fused jumper wire between the signal circuit and the low reference circuit of the HO2S and verify the HO2S 1 parameter is less than 60 mV.
    • If greater than 60 mV, test the signal circuit of the HO2S for an open/high resistance. If the circuit/connections test normal, replace the ECM.
  5. Verify that none of the following conditions exist:
    • If you find any of the above conditions, repair as necessary.
  6. If all circuits/connections test normal, replace the HO2S.
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