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COOLING SYSTEM CONCERNS-RUNS COLD [SKYACTIV-G]

id0103s4890500

Troubleshooting item

Cooling system concerns-runs cold

Description

•  Engine does not reach normal operating temperature.

Possible cause

•  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)

•  Cooling fan system malfunction

•  Improper operation of coolant control valve

•  Active air shutter malfunction (With active air shutter)

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	• 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) • Cooling fan system malfunction • Improper operation of coolant control valve • Active air shutter malfunction (With active air shutter)
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-G (E)].)
2		No	Go to the next step.
3	INSPECT ECT SENSOR No.1 FOR MALFUNCTION • Inspect the applicable part. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) • Is the part normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
4	INSPECT ECT SENSOR No.2 FOR MALFUNCTION • Inspect the applicable part. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) • 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-G (WITH CYLINDER DEACTIVATION (E))].) (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
5	INSPECT COOLANT CONTROL VALVE FOR MALFUNCTION • Inspect the applicable part. (See COOLANT CONTROL VALVE INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See COOLANT CONTROL VALVE INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) • 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 COOLANT CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See COOLANT CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
6	INSPECT COOLING FAN CONTROL SYSTEM OPERATION • Perform the Cooling Fan Control System Inspection. (See COOLING FAN MOTOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See COOLING FAN MOTOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) • Does the cooling fan control system operate properly?	Yes	Vehicles with active air shutter: • Go to the next step. Vehicles without active air shutter: • Go to repair completion verification.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	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.
7		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-G (WITH CYLINDER DEACTIVATION (E))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
Repair completion verification 2		No	Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)