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.
Chart A-1 - No Check Engine Light: Notes
There should always be a steady CHECK ENGINE light when ignition is on and engine is stopped. Battery voltage is supplied to bulb through C7 fuse. The Electronic Control Module (ECM) turns the light on by providing a ground path through Violet wire.
- Battery voltage at circuit No. 240 is protected by a fusible link, located in relay/fuse box under the hood, near the battery.
- If voltage is present on circuit No. 240, check for faulty ECM ground or ECM.
- Using a test light connected to 12 volts, probe each system ground circuit to ensure a good ground is present.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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