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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1366 (ENGINE CONTROL SYSTEM (INTRODUCTION) -- 1.8L (LNK))DESCRIPTION AND OPERATIONPOWERTRAIN CONTROL MODULE (PCM) DESCRIPTIONFAIL-SAFE FUNCTION
2004 Oldsmobile Bravada RWD

Fail-Safe Function

2004 Oldsmobile Bravada RWDSECTION Fail-Safe Function
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

When a malfunction occurs within the engine control system, the PCM maintains control over the fuel injection system, the idle speed control system, etc. The PCM controls these systems by using calculated values and/or backup programs stored within the PCM.

This function is called the fail-safe function. With the fail-safe function, a certain level of engine performance is available even when a malfunction occurs. The fail-safe function prevents a complete loss of engine performance.

The systems covered by the fail-safe function are as follows:

  • The MAF sensor
  • The IAT sensor
  • The TP sensor
  • The HO2S heater circuits
  • The KS system
  • The CPU in the PCM
  • The fuel cutoff for ignition system failures
RENDER: 1.0x

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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.