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 MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTIONCIRCUIT OPEN/SHORT INSPECTION
2013 Mazda MX-5 Miata Grand Touring, Automatic Trans
Circuit Open/Short Inspection
2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION Circuit Open/Short Inspection
- Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION ).
- Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- ECT sensor terminal A and PCM terminal 2AH
- ECT sensor terminal B and PCM terminal 2AY
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- ECT sensor terminal A and power supply
- ECT sensor terminal A and body ground
- ECT sensor terminal B and power supply
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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.