Diagnostic Procedure

COOLING SYSTEM CONCERNS-RUNS COLD (SKYACTIV-G) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	DETERMINE IF MALFUNCTION CAUSE IS HVAC SYSTEM OR ENGINE Is a customer complaint [Lack of passenger compartment heat] only?	Yes	Inspect the A/C system. Repair or replace the malfunctioning location and perform the repair completion verification 1.
1		No	Go to the next step.
2	VERIFY IDLE SPEED Does the engine speed continue at fast idle?	Yes	Perform the symptom troubleshooting [FAST IDLE/RUNS ON]. (See FAST IDLE/RUNS ON [SKYACTIV-G] .)
2		No	Go to the next step.
3	VERIFY IF MALFUNCTION CAUSED BY ECT SENSOR INPUT SIGNAL MALFUNCTION Access the PCM PID [ECT] using the M-MDS. (See PID/DATA MONITOR INSPECTION .) Is the ECT PID value same as indicator/warning light readings?	Yes	Go to Step 5.
3		No	Go to the next step.
4	VERIFY ECT SENSOR FOR MALFUNCTION Inspect the applicable part. (Refer to ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G 2.0] in service information.) Is the part normal?	Yes	Inspect the instrument cluster. (Refer to INSTRUMENT CLUSTER INSPECTION in service information.) If there is any malfunction: Replace the instrument cluster and perform the repair completion verification 1. (Refer to INSTRUMENT CLUSTER REMOVAL/INSTALLATION in service information.)
4		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0] in service information.)
5	VERIFY IF MALFUNCTION CAUSED BY COOLING FAN OPERATION MALFUNCTION Perform the Cooling Fan Control System Inspection. (Refer to [COOLING FAN MOTOR INSPECTION ] in service information.) Does the cooling fan control system operate properly?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
6	INSPECT THERMOSTAT FOR MALFUNCTION Inspect the thermostat. (Refer to THERMOSTAT INSPECTION [SKYACTIV-G 2.0] in service information.) Is the thermostat normal?	Yes	Reinstall the thermostat, then go to the next step.
6		No	Replace the thermostat and perform the repair completion verification 1. (Refer to THERMOSTAT REMOVAL/INSTALLATION [SKYACTIV-G 2.0] in service information.)
7	VERIFY THAT NO FOREIGN MATTER IS IN ENGINE COOLANT Drain the engine coolant. (Refer to [ENGINE COOLANT REPLACEMENT ] in service information.) Has foreign matter penetrated the engine coolant?	Yes	Replace the engine coolant and perform the repair completion verification 1. (Refer to [ENGINE COOLANT REPLACEMENT ] in service information.)
7		No	Go to the next step.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. (Explain contents of repair to customer)
Repair completion verification 1		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .) If the CAN communication is normal, perform the diagnosis from Step 1. If the malfunction recurs, replace the PCM. (Refer to PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0] in service information.)