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COOLING SYSTEM CONCERNS-RUNS COLD [SKYACTIV-X]

id0103hf890500

Troubleshooting item

Cooling system concerns-runs cold

Description

•  Engine does not reach normal operating temperature.

Possible cause

•  PCM DTCs are stored.

―  Communication error between PCM and active air shutter (Fully open)

•  ECT sensor No.1 malfunction (value higher than actual engine coolant temperature detected)

•  ECT sensor No.2 malfunction (value higher than actual engine coolant temperature detected)

•  ECT sensor No.3 malfunction (value higher than actual engine coolant temperature detected)

•  Fan control module malfunction

•  Cooling fan system malfunction

―  Cooling fan motor malfunction

•  Thermostat malfunction (stuck at fully open)

•  Electric thermostat malfunction (stuck at fully open)

•  Coolant switching valve (CSV) malfunction (stuck at fully open)

•  Active air shutter malfunction

System wiring diagram

•  Not applicable

Connector diagram

•  Not applicable

Troubleshooting item	Cooling system concerns-runs cold
Description	• Engine does not reach normal operating temperature.
Possible cause	• PCM DTCs are stored. ― Communication error between PCM and active air shutter (Fully open) • ECT sensor No.1 malfunction (value higher than actual engine coolant temperature detected) • ECT sensor No.2 malfunction (value higher than actual engine coolant temperature detected) • ECT sensor No.3 malfunction (value higher than actual engine coolant temperature detected) • Fan control module malfunction • Cooling fan system malfunction ― Cooling fan motor malfunction • Thermostat malfunction (stuck at fully open) • Electric thermostat malfunction (stuck at fully open) • Coolant switching valve (CSV) malfunction (stuck at fully open) • Active air shutter malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

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 heater system. Repair or replace the malfunctioning location and perform the repair completion verification.
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-X].)
2		No	Go to the next step.
3	VERIFY PCM DTCs • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-X)].)
3		No	Go to the next step.
4	INSPECT ECT SENSOR No.1 FOR MALFUNCTION • Inspect the applicable part. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-X 2.0].) • Is the part normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
5	INSPECT ECT SENSOR No.2 FOR MALFUNCTION • Inspect the applicable part. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-X 2.0].) • Is the part normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
6	INSPECT ECT SENSOR No.3 FOR MALFUNCTION • Inspect the applicable part. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-X 2.0].) • Is the part normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
7	INSPECT COOLANT SWITCHING VALVE (CSV) FOR MALFUNCTION • Inspect the applicable part. (See COOLANT SWITCHING VALVE (CSV) INSPECTION [SKYACTIV-X 2.0].) • Is the part normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See COOLANT SWITCHING VALVE (CSV) REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
8	INSPECT FAN CONTROL MODULE FOR MALFUNCTION • Inspect the applicable part. (See FAN CONTROL MODULE INSPECTION [SKYACTIV-X 2.0].) • Is the part normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See COOLING FAN MOTOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
9	INSPECT ACTIVE AIR SHUTTER FOR MALFUNCTION • Inspect the applicable part. (See ACTIVE AIR SHUTTER INSPECTION.) • Is the part normal?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ACTIVE AIR SHUTTER REMOVAL/INSTALLATION.)
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 CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) • If the CAN communication is normal, perform the diagnosis from Step 1. ― If the malfunction recurs, go to the next step.
Repair completion verification 2	VERIFY IF MALFUNCTION IS CAUSED BY NOT PERFORMING PCM REPROGRAMMING • Verify repair information and verify that there is a new calibration in the PCM. • Is there a new calibration in the PCM?	Yes	Perform the PCM reprogramming and verify if the malfunction symptom was corrected. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
Repair completion verification 2		No	Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)