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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.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE (EXCEPT B2300, B3000, B4000 & TRIBUTE)

Temperature °F (°C) Ohms
Mazda6
2.3L
68 (20) 35,480-39,200
158 (70) 5070-5600
176 (80) 3650-4020
3.0L
68 (20) 2200-2800
176 (80) 290-400
Miata (1)
68 (20) 2270-2740
176 (80) 290-340
Protege
68 (20) 2200-2600
176 (80) 290-340
MPV
68 (20) 2200-2800
176 (80) 290-400
(1) Measure resistance between ECT sensor terminals "A" and "B". See Fig 2 .
Fig 1: Identifying ECT Sensor Terminals (Mazda6 & MPV)
G00250871Courtesy of MAZDA MOTORS CORP.
Fig 2: Identifying ECT Sensor Terminals (Miata)
G99I03106Courtesy of MAZDA MOTORS CORP.
Fig 3: Identifying ECT Sensor Terminals (Protege)
G00250872Courtesy of MAZDA MOTORS CORP.