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 PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM LF 2.0L]ENGINE CONTROL SYSTEM OPERATION INSPECTION [LF]ELECTRONIC THROTTLE CONTROL SYSTEM INSPECTIONENGINE COOLANT TEMPERATURE COMPENSATION INSPECTION
2013 Mazda MX-5 Miata Grand Touring, Automatic Trans
Engine coolant temperature compensation inspection
2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION Engine coolant temperature compensation inspection
- Connect the M-MDS to the DLC-2.
- Access the following PIDs:
- ECT
- IAT
- RPM
- Verify that the engine is cold, then start the engine.
- Verify that the engine speed decreases as the engine warms up.
- If the engine speed does not decrease or decreases slowly, inspect the following:
- ECT sensor and related wiring harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [LF] ).
- Throttle body and related wiring harness (See THROTTLE BODY INSPECTION [LF] ).
- If the engine speed does not decrease or decreases slowly, inspect the following:
RENDER: 1.0x
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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.