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.
2024 Mazda 3 Preferred, 4D HatchbackFACTORY OEM SERVICE PROCEDURE
Function inspection
- Connect the M-MDS to the DLC-2.
- Switch the ignition ON (engine off).
- Display the PCM PID [ECT_VOLT] and [ECT]. (Refer to [PID/DATA MONITOR INSPECTION ] in the troubleshooting information.) (Refer to [PID/DATA MONITOR TABLE [PCM (SKYACTIV-G 2.5T)] ] in the troubleshooting information.)
- Compare the voltage indications for PCM PID [ECT_VOLT and the temperature indications for PID [ECT] with the standards in the table indicated below.
- If they do not match the standard, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
- If they match the standard, perform the resistance inspection. (See RESISTANCE INSPECTION .)ENGINE COOLANT TEMPERATURE SENSOR SPECIFICATIONS (STANDARD)
ECT_VOLT ECT V °C {°F} Approx. 3.10 20 {68} Approx. 2.16 40 {104} Approx. 1.40 60 {140} Approx. 0.87 80 {176} Approx. 0.54 100 {212}
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.