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, refer to 12 00... INFORMATION ON WORKING ON IGNITION SYSTEM .
Removing and installing electronic control units, refer to 12 00... INSTRUCTIONS FOR REMOVING AND INSTALLING ELECTRONIC CONTROL UNITS .
Welding work (overload protection of control units), refer to 12 00... INSTRUCTIONS FOR WELDING WORK (OVERLOAD PROTECTION OF CONTROL UNITS) .
Disconnecting and connecting battery, refer to 12 00... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .
Disconnecting and connecting test equipment, refer to 12 00... INSTRUCTIONS FOR CONNECTING AND DISCONNECTING TEST UNITS .
Component inspection, refer to 12 00... INSTRUCTIONS ON COMPONENT TESTING .
External jump-starting aid, refer to 12 00... INSTRUCTIONS ON STARTING AID .
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.