DTC Detection Logic

NOTE:

If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or P0118. Refer to "DTC LOGIC ".
If DTC P0125 is displayed with P0116, first perform the trouble diagnosis for DTC P0116. Refer to "DTC LOGIC ".

DTC No.	Trouble diagnosis name (Trouble diagnosis content)	DTC detecting condition	Possible cause
P0125	ECT SENSOR [Insufficient engine coolant temperature for closed loop fuel control]	Voltage sent to ECM from the sensor is not practical, even when some time has passed after starting the engine. Engine coolant temperature is insufficient for closed loop fuel control.	Harness or connectors (High resistance in the circuit) Engine coolant temperature sensor Thermostat