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.
NIPPONDENSO Electronic Ignition System: Testing: Notes
Be sure all connections are correct, as reverse battery polarity within the system will damage the 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.
Be careful when checking systems, as slight variations may occur between models. Connectors and wire colors also may vary from model to model.
Illustrations, although specific to certain models, may not apply totally to all models.
Do not allow water to enter ignitor.
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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