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.
Logic Module
The logic module is a digital computer containing a microprocessor. The module receives input signals from various switches and sensors. It then computes the fuel injector pulse width, spark advance, ignition coil dwell, idle speed, purge, and cooling fan turn on and alternator charge rate.
The logic module tests many of its own input and output circuits. If a fault is found in a major system, this information is stored in the logic module. Information on this fault can be displayed by using the instrument panel power loss light or by connecting a diagnostic read out and reading a numbered display code which directly relates to a general fault.
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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.