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.
Catalytic Converter Protection
The catalytic converter protection feature is a function of the DME control module. The control module can cancel injector triggering, to prevent unburned fuel from entering the exhaust system, when there is a problem with the ignition system. The control module is programmed to selectively cancel the injector final stage output(s) based on processing and signals received from the ignition monitoring circuit. Depending on the version, various different monitoring and cancelling possibilities are used. See Fig 1.
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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.