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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 109 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 3.4L)SYSTEM TESTSMIL INOPERATIVEMIL OPERATION
2004 Oldsmobile Bravada RWD

MIL Operation

2004 Oldsmobile Bravada RWDSECTION MIL Operation
WARNING: This page is about a different car, the 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, 2002 Chevrolet Monte Carlo, and 2002 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

MIL is located on instrument panel and is displayed as CHECK ENGINE light.

MIL Function

  • The MIL informs the driver that a malfunction has occurred and the vehicle should be taken in for service as soon as possible.
  • The MIL illuminates during a bulb test and a system test.
  • A DTC will be stored if a MIL is requested by the diagnostic.

MIL Illumination

  • The MIL will illuminate with ignition ON and the engine not running.
  • The MIL will turn OFF when the engine is started.
  • The MIL will remain ON if the self-diagnostic system has detected a malfunction.
  • The MIL may turn OFF if the malfunction is not present.
  • If the MIL is illuminated and then the engine stalls, the MIL will remain illuminated so long as the ignition switch is ON.
  • If the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition switch is cycled OFF, then ON.

Perform the Diagnostic System Check - Engine Controls, when the following conditions are present:

  • The MIL does not turn ON when the ignition switch is turned to the RUN position. See above for MIL operation.
  • The MIL remains ON while the engine is running.
  • The MIL is flashing while the engine is running.
  • A driveability symptom is determined.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.