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.
2002 Mazda MX-5 Miata Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Diagnostic Procedure
- Turn ignition off. Connect New Generation Star (NGS) tester or equivalent to OBD-II Data Link Connector-2 (DLC-2). See Figure. Turn ignition on. Perform KOEO Self-Test. If same P0605 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step. If no DTC is present, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
- Return vehicle to original condition. Using NGS tester or equivalent, clear DTCs from PCM memory. Start engine and let it idle until it reaches normal operation temperature. Monitor for DTCs. If any other DTC is present, follow appropriate DTC diagnostic procedure.
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.