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.
Electronic Control System
PCM continuously monitors all electrical circuits. If PCM detects circuit problems or out-of-range sensors, DTCs are recorded. If problem continues for a predetermined time, MIL will illuminate.
If MIL remains illuminated, DTCs are currently being detected. If MIL is off, but PCM has detected a circuit or sensor problem, DTCs are stored in PCM memory.
Stored DTCs may be retrieved from PCM memory using scan tool. DTCs cannot be retrieved by grounding 16-pin Data Link Connector (DLC).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.