April 5, 2026: LEMON Manuals is launched! Read the announcement.

Function Explanation (DTC Detection Outline)

If the engine coolant temperature detected by the ECT sensor is not rising 3°C {5°F} or more during a 5 min period after the engine is started, the PCM determines an ECT sensor malfunction and stores a DTC.

Courtesy of MAZDA MOTORS CORP.