Diagnostic Procedure

LOW ENGINE COOLANT TEMPERATURE INDICATOR LIGHT/HIGH ENGINE COOLANT TEMPERATURE WARNING LIGHT ILLUMINATES DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	PERFORM CAN MALFUNCTION DIAGNOSIS AND DTC INSPECTION Perform the CAN malfunction diagnosis according to the recommendation of FOREWORD (INSTRUMENT CLUSTER) malfunction diagnosis, and if there is no CAN malfunction, perform inspection for DTCs. (See DTC INSPECTION (INSTRUMENT CLUSTER) .) Is the DTC displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE (INSTRUMENT CLUSTER) .)
1		No	Go to the next step.
2	VERIFY THE MALFUNCTION SYMPTOM Cool down the engine. When the ignition is switched ON, does the engine coolant temperature warning light illuminate or flash?	Yes	Go to Step 4.
2		No	Go to the next step.
3	VERIFY ILLUMINATION OF LOW ENGINE COOLANT TEMPERATURE INDICATOR LIGHT Start the engine. Monitor the PID ECT using the M-MDS. Verify that the low engine coolant temperature indicator light illuminates when the ECT monitor value is 55 °C {131 °F}or more. Does the low engine coolant temperature indicator light illuminate?	Yes	Go to the next step.
3		No	The system is operating normally.
4	INSPECT ECT SENSOR Inspect the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G 2.5T] .) (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .) Is the ECT sensor normal?	Yes	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
4		No	Replace the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .) (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .)