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.
Self-Diagnostic System: Description
ECM constantly looks at information from various input devices to control systems that affect vehicle performance. ECM self-diagnostic capabilities allow for trouble shooting system through a Malfunction Indicator Light (MIL). MIL will illuminate to alert driver of a system malfunction. The type of failure (hard or intermittent) will affect how the MIL illuminates. The specific malfunction can be determined via a 2-digit code displayed by MIL. To retrieve codes, see appropriate TESTS W/CODES - 2.6L 4-CYL article.
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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.