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.
1985 Toyota 4Runner Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Preliminary Inspection
The following precautions should be observed while servicing or testing a Nippondenso ignition system.
- Ensure all connections are correct, reverse battery polarity may damage ignitor (ignition control unit).
- DO NOT disconnect battery while engine is running or transistors may be damaged.
- If a tachometer is connected to system, connect tachometer positive lead to coil negative terminal.
- Use care when checking systems, as variations may occur between models. Connectors and wire colors also may vary.
Factory Service Tools
Use the Manual With the Right Hardware
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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.