Function Explanation (DTC Detection Outline)

Vehicles without coolant control valve: 

• If the engine coolant temperature detected by the ECT sensor No. 1 is not rising 6°C {11°F} or more during a 5 min period after the engine is started, the PCM determines an ECT sensor No. 1 malfunction and stores a DTC.

Courtesy of MAZDA MOTORS CORP.

Vehicles with coolant control valve: 

• If the engine coolant temperature detected by the ECT sensor No. 1 is not rising 3°C {5°F} or more during a 7 min period after the engine is started, the PCM determines an ECT sensor No. 1 malfunction and stores a DTC.

Courtesy of MAZDA MOTORS CORP.