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.
Trouble Shooting: Notes
Before proceeding with diagnosis, the following precautions MUST be followed:
- Vehicle must have a fully charged battery and functional charging system.
- When testing voltage or continuity at any control module, use terminal side and not wire end. DO NOT probe a wire through insulation.
- Only perform test steps indicated. It is not necessary to perform all steps in a test.
- Turn ignition switch to OFF position before disconnecting or connecting components.
- Use extreme care when connecting or disconnecting wiring during testing to prevent accidental grounding or shorting.
- Unless instructed to do so in test steps, DO NOT use a test light in place of a DVOM.
- Always disconnect scan tool after use.
- Always disconnect scan tool before charging battery.
- Always perform appropriate verification tests after repairs are made. See VERIFICATION TESTS .
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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