COOLING SYSTEM CONCERNS-RUNS COLD [SKYACTIV-G]
COOLING SYSTEM CONCERNS-RUNS COLD [SKYACTIV-G]
SM2334619
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
• Thermostat malfunction (stuck at fully open) (built-into 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.
|
|
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”.
|
|
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 (US))].) (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
|
Yes
|
Go to the next step.
|
|
No
|
Repair or replace the malfunctioning location and perform the repair completion verification.
|
||
|
4
|
INSPECT ECT SENSOR No.2 FOR MALFUNCTION
• Inspect the applicable part. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
|
Yes
|
Go to the next step.
|
|
No
|
Repair or replace the malfunctioning location and perform the repair completion verification.
|
||
|
5
|
INSPECT COOLANT CONTROL VALVE FOR MALFUNCTION
• Inspect the applicable part. (See COOLANT CONTROL VALVE INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See COOLANT CONTROL VALVE INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
|
Yes
|
Go to the next step.
|
|
No
|
Repair or replace the malfunctioning location and perform the repair completion verification.
|
||
|
6
|
INSPECT COOLING FAN CONTROL SYSTEM OPERATION
• Perform the Cooling Fan Control System Inspection. (See COOLING FAN MOTOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See COOLING FAN MOTOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• 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.
|
|
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.
|
|
No
|
Repair or replace the malfunctioning location and perform the repair completion verification.
|
||
|
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)
|
|
No
|
Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
• If the CAN communication is normal, perform the diagnosis from Step 1.
|
||
|
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 (US))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
|
|
No
|
Replace the PCM.
|