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Home >> Chevrolet >> 2008 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.8L (L79) >> Diagnostic Information and Procedures >> Malfunction Indicator Lamp (MIL) Always On >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the ECM.
  2. Ignition ON, observe the malfunction indicator lamp (MIL).
    • If the MIL is illuminated, test the control circuit for a short to ground between the ECM and the I/P. If the circuit tests normal, replace the I/P or the DIC/clock.
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