Details On DTCs

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION AND POSSIBLE CAUSE

DESCRIPTION	ECT sensor No. 1 circuit range/performance problem
DETECTION CONDITION	Determination conditions	During the 5 min after the engine is started, the engine coolant temperature does not increase above 6 °C {11 °F}.
	Preconditions	Before starting the engine, leave the vehicle with the engine turned off for 6 hours or more. The following DTCs are not detected: ECT sensor No. 1: P0117:00, P0118:00
	Drive cycle	1
	Self test type	CMDTC self test
	Sensor used	ECT sensor No. 1
FAIL-SAFE FUNCTION	Not applicable
VEHICLE STATUS WHEN DTCs ARE OUTPUT	Illuminates check engine light.
POSSIBLE CAUSE	ECT sensor No. 1 connector or terminals malfunction PCM connector or terminals malfunction ECT sensor No. 1 loose ECT sensor No. 1 malfunction Poor assembly of engine coolant hose (engine coolant passage malfunction) Poor engine coolant, leakage, or freezing Use of unspecified engine coolant Thermostat malfunction PCM malfunction