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Home › Chevrolet › 2008 › Optra LS, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 1.8L (LDA) › Diagnostic Information and Procedures › DTC P0443 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the EVAP purge solenoid.
  2. Ignition ON, test for battery voltage between the ignition 1 voltage circuit terminal A and ground.
    • If less 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 B and the ignition 1 voltage circuit terminal A.
  4. Ignition ON, command the EVAP purge solenoid ON with a scan tool. The test lamp should pulse ON and OFF for about 3-5 seconds.
    • If the test lamp is always ON, test the control circuit for a short to ground. If circuit tests normal, replace the ECM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the EVAP purge solenoid.
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