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.
Key Interlock Solenoid: Miata
Disconnect negative battery cable. Remove steering column cover. Disconnect key interlock solenoid connector. Insert ignition key in key cylinder. Inspect the key interlock operation when battery voltage is applied to solenoid terminal "C". Attach negative lead to terminal "D". See Fig 1 . If solenoid does not operate, replace key interlock solenoid. See KEY INTERLOCK SOLENOID under REMOVAL & INSTALLATION. Connect the negative battery cable.
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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.