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.
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HOMESERVICE MANUALSMAZDA1999PROTEGE ES, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC DIAGNOSTIC PROCEDURESIGNITION CHECKSIGNITION COIL RESISTANCE (MIATA)
1999 Mazda Protege ES, Automatic
Ignition Coil Resistance (Miata)
1999 Mazda Protege ES, AutomaticSECTION Ignition Coil Resistance (Miata)
- Disconnect 4-pin connector. Using ohmmeter, measure primary resistance between terminals "A" and "D". See Figure. Resistance should be as specified. See IGNITION COIL RESISTANCE table. If resistance is not as specified, replace coil.
- Using an ohmmeter, measure secondary resistance between terminal "A" and coil tower. See Figure. Resistance should be as specified. See IGNITION COIL RESISTANCE table. If resistance is not as specified, replace coil.
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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.