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.
12 00 Contents of Engine Electrical System General
General Information -> Working on ignition system. See 12 13 Notes on Checking Ignition System .
-> Removing and installing electronic control units. See 12 00... Instructions for Removing And Installing Electronic Control Units .
-> Welding work (overload protection of control units).
-> Disconnecting and connecting battery. See 12 00... Instructions for Disconnecting And Connecting Battery .
-> External jump-starting aid. See 12 00... INSTRUCTIONS ON STARTING AID .
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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.