2021 Mazda MX-5 Miata Club, Automatic TransFACTORY OEM SERVICE PROCEDURE

Related PIDs

Item (definition) Unit/Condition Definition Condition/Specification (Reference)
ECT °C, °F Engine coolant temperature input from ECT sensor No. 1
  • Displays ECT
V ECT sensor No. 1 voltage Ignition switched ON (engine off)
  • ECT is 92°C {198°F}: Approx. 0.65 V

Idle (after warm up)
  • ECT is 93°C {199°F}: Approx. 0.64 V

Racing (Engine speed is 2, 000 RPM)
  • ECT is 92°C {198°F}: Approx. 0.66 V

Racing (Engine speed is 4, 000 RPM)
  • ECT is 93°C {199°F}: Approx. 0.64 V
IAT °C, °F Intake air temperature (No. 1) input from IAT sensor No. 1
  • Displays IAT (No. 1)
V IAT sensor No. 1 voltage
  • IAT is 60°C {140°F}: Approx. 1.13 V
  • IAT is 63°C {145°F}: Approx. 1.07 V
  • IAT is 65°C {149°F}: Approx. 1.01 V
RPM RPM Engine speed
  • Displays engine speed


Item (definition) Unit/Condition Definition Condition/Specification (Reference)
RPM RPM Engine speed
  • Displays engine speed
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.

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