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Home › Chevrolet › 2007 › Optra LS, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 1.6L (L91) › Diagnostic Information and Procedures › DTC P0327 › Circuit/System Testing

Circuit/System Testing

    IMPORTANT: If the knock sensor lead is damaged in any way, replace the KS.
  1. Ignition OFF, disconnect the harness connector at the KS.
  2. Ignition ON, test for 2.0-3.0 volts between the signal circuit and ground.
    • If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuits/connections test normal, replace the ECM.
    • If greater than the specified value, test the signal circuit for a short to voltage. If the circuits/connections test normal, replace the ECM.
  3. Ignition ON, test for 2.0-3.0 volts between the low reference circuit and ground.
    • If less than the specified value, test the low reference circuit for a short to ground or an open/high resistance. If the circuits/connections test normal, replace the ECM.
    • If greater than the specified value, test the low reference circuit for a short to voltage. If the circuits/connections test normal, replace the ECM.
  4. If all circuits/connections test normal, replace the KS sensor.
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