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Engine Coolant Temperature Sensor

NOTE: On B3000, B4000 and Tribute 3.0L, Engine Coolant Temperature (ECT) sensor specifications are the same as Intake Air Temperature (IAT) sensor specifications. See INTAKE AIR TEMPERATURE (IAT) SENSOR SPECIFICATIONS (B2300, B3000, B4000 & TRIBUTE)  table under INTAKE AIR TEMPERATURE SENSOR.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE (EXCEPT B2300, B3000, B4000 & TRIBUTE)

Temperature °F (°C) Ohms
Miata (1)
68 (20) 2270-2740
176 (80) 290-340
Millenia, Protege & Protege5 (2)
68 (20) 2200-2600
176 (80) 290-340
MPV (2)
68 (20) 2200-2800
176 (80) 290-400
626 (2)
68 (20) 35,500-39,200
140 (60) 7180-7920
(1) Measure resistance between ECT sensor terminals "A" and "C". See Fig 1 .
(2) Measure resistance between ECT sensor terminals.
Fig 1: Identifying ECT Sensor Terminals (Miata)
G99I03106Courtesy of MAZDA MOTORS CORP.
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