Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2000 Pontiac Firefly (CANADA) L3-1.0LFACTORY OEM SERVICE PROCEDURE
Fail-Safe Function
When a malfunction occurs within the engine control system, the powertrain control module (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 Engine Coolant Temperature (ECT) sensor
^ The Throttle Position (TP) sensor
^ The Manifold Absolute Pressure (MAP) sensor
^ The Fuel Level sensor
^ The Vehicle Speed (VSS) sensor
^ The Closed Throttle Position (CTP) switch
^ The Barometric Pressure sensor
^ The Central Processing Unit (CPU) in 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 Engine Coolant Temperature (ECT) sensor
^ The Throttle Position (TP) sensor
^ The Manifold Absolute Pressure (MAP) sensor
^ The Fuel Level sensor
^ The Vehicle Speed (VSS) sensor
^ The Closed Throttle Position (CTP) switch
^ The Barometric Pressure sensor
^ The Central Processing Unit (CPU) in the PCM
Factory Service Tools
Use the Manual With the Right Hardware
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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.