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.
1995 Mazda MX-5 Miata Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Ignition Coil Resistance
- Remove primary and secondary leads from ignition coil. Using ohmmeter, check primary resistance between positive and negative terminals of coil. See Fig 1 . Resistance should be as specified in IGNITION COIL RESISTANCE table. If resistance is not as specified, replace ignition coil.
- Check secondary resistance between coil towers of each coil. See Fig 1 . See IGNITION COIL RESISTANCE table. If resistance is not within specification, replace coil.
- Check insulation resistance of case. Using a 500-volt megger, measure insulation resistance between positive terminal and coil case. If resistance is not more than 10 megohms, replace ignition coil.
IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C)
| Application | Primary | Secondary | ||
|---|---|---|---|---|
| Miata | (1) | 8700-12,900 | ||
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Factory Service Tools
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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.