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Home >> Chevrolet >> 2004 >> Optra Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - 1.4L DOHC - Description And Operation >> Description and Operation >> Engine Control Module Description >> Common EOBD Terms >> Diagnostic >> Malfunction Indicator Lamp (MIL)

Malfunction Indicator Lamp (MIL)

The MIL is required by on-board diagnostics (EOBD) that it illuminates under a strict set of guide lines.

Basically, the MIL is turned ON when the ECM detects a DTC that will impact the vehicle emissions.

The MIL is under the control of the diagnostic executive. The MIL will be turned ON if an emissions-related diagnostic test indicates a malfunction has occurred. It will stay ON until the system or component passes the same test, for 3 consecutive trips, with no emissions related faults.

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