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.
2021 Mazda MX-5 Miata Club, Automatic TransFACTORY OEM SERVICE PROCEDURE
Output device
x: Applicable
| Item | MAIN RELAY CONTROL | DRIVE-BY-WIRE CONTROL | HYDRAULIC VARIABLE VALVE TIMING CONTROL | ELECTRIC VARIABLE VALVE TIMING CONTROL | FUEL INJECTION CONTROL SYSTEM | FUEL PUMP CONTROL | HIGH PRESSURE FUEL PUMP CONTROL | ELECTRONIC SPARK ADVANCE CONTROL | PURGE CONTROL | A/F SENSOR HEATER CONTROL | HO2S HEATER CONTROL | A/C CUT-OFF CONTROL | ELECTRICAL FAN CONTROL | STARTER CUT-OFF CONTROL | GENERATOR CONTROL | ENGINE OIL CONTROL | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Main relay | x | |||||||||||||||||
| Throttle valve actuator | x | |||||||||||||||||
| Electric variable valve timing motor/driver | x | |||||||||||||||||
| Electric variable valve timing relay | x | |||||||||||||||||
| OCV | x | |||||||||||||||||
| Fuel injector No. 1-No. 4 | x | |||||||||||||||||
| Fuel pump relay | x | |||||||||||||||||
| Spill valve control solenoid valve (High pressure fuel pump) | x | |||||||||||||||||
| Ignition coil No. 1-No. 4 | x | |||||||||||||||||
| Purge solenoid valve | x | |||||||||||||||||
| A/F sensor heater | x | |||||||||||||||||
| HO2S heater | x | |||||||||||||||||
| A/C relay | x | |||||||||||||||||
| Cooling fan relay | x | |||||||||||||||||
| Fan control module | x | |||||||||||||||||
| Starter relay | x | |||||||||||||||||
| Generator (Field coil) | x | |||||||||||||||||
| Engine oil solenoid valve | x | |||||||||||||||||
| CV solenoid valve (1) | Only used for OBD. | |||||||||||||||||
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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.