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Home >> Chevrolet >> 2008 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.4L DOHC >> Diagnostic Information and Procedures >> DTC P0444 or P0445 >> 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 1 and ground.
    • If less than B+, 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 2 and the ignition 1 voltage circuit terminal 1.
  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 the 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 the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the EVAP purge solenoid.
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