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.
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HOMESERVICE MANUALSGEO1993PRIZM L4-1600CC 1.6L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONFAIL-SAFE FUNCTION
1993 Geo Prizm L4-1600cc 1.6L DOHC
Fail-Safe Function
1993 Geo Prizm L4-1600cc 1.6L DOHCSECTION Fail-Safe Function
FAIL-SAFE FUNCTION
When a malfunction occurs in the electronic engine control system and is detected by the engine control module (ECM)/powertrain control module (PCM), the injectors, idle air control (IAC) valve and other major components are supported or compensated for by signals from a program stored in the ECM/PCM to sustain minimum driveability until repairs to the electronic engine control system can be performed.
This function is called the "fail-safe function." This function provides a minimum level of engine performance which is available even when failure in the electronic engine control system occurs.
When a malfunction occurs in the electronic engine control system and is detected by the engine control module (ECM)/powertrain control module (PCM), the injectors, idle air control (IAC) valve and other major components are supported or compensated for by signals from a program stored in the ECM/PCM to sustain minimum driveability until repairs to the electronic engine control system can be performed.
This function is called the "fail-safe function." This function provides a minimum level of engine performance which is available even when failure in the electronic engine control system occurs.
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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.