COOLING SYSTEM CONCERNS-OVERHEATING [SKYACTIV-G (US)]
COOLING SYSTEM CONCERNS-OVERHEATING [SKYACTIV-G (US)]
SM2565589
id0103s48904s6
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Troubleshooting item |
Cooling system concerns-overheating |
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Description
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• The engine coolant temperature is abnormally high.
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Possible cause
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• Engine heat generation amount is excessive
• PCM DTC is stored
• Improper operation of A/C system
• Insufficient air blow volume
• Cooling system cap malfunction
• Cooling fan motor assembly malfunction
• Cooling fan motor connector malfunction
• Active air shutter malfunction (With active air shutter)
• Improper indication of high engine coolant temperature warning indication
• Blown fuse
• Engine coolant system malfunction
• Leakage around heater unit in passenger compartment
• Drive belt damage
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System wiring diagram
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• Not applicable
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Connector diagram
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• Not applicable
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Diagnostic Procedure
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Step |
Inspection |
Results |
Action |
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1
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INSPECT VEHICLE CONDITION FOR EFFECT ON MALFUNCTION
• Verify how the customer drives the vehicle by asking the customer the following:
• Is the engine generating excessive heat when driven?
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Yes
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Explain to the customer that the vehicle is normal and give them advice how to use vehicle and provide a specific example of the conditions in which the engine overheats.
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No
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Go to the next step.
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2
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VERIFY PCM DTC
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Are any DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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Go to the next step.
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3
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DETERMINE IF MALFUNCTION CAUSE IS A/C SYSTEM OR OTHER
• Start the engine and run it at idle speed.
• Turn the A/C switch off.
• Does the A/C compressor disengaged?
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Yes
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Go to the next step.
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No
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Perform the symptom troubleshooting “A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY”.
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4
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INSPECT ECT SENSOR No.1 SIGNAL
• Access the ECT PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Compare the ECT PID and high engine coolant temperature warning indication operation.
• Is the ECT PID value same as warning indication readings
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Yes
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Go to Step 6.
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No
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Go to the next step.
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5
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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?
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Yes
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Inspect the body control module (BCM).
• If there is any malfunction:
• If there is no malfunction:
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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6
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INSPECT ECT SENSOR No.2 SIGNAL
• Access the ECT2 PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Compare the ECT2 PID and high engine coolant temperature warning indication operation.
• Is the ECT2 PID value same as warning indication readings
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Yes
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Go to Step 8.
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No
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Go to the next step.
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7
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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?
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Yes
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Inspect the body control module (BCM).
• If there is any malfunction:
• If there is no malfunction:
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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8
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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?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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9
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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?
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Yes
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Vehicles with active air shutter:
• Go to the next step.
Vehicles without active air shutter:
• Go to Step 11.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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10
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INSPECT ACTIVE AIR SHUTTER FOR MALFUNCTION
• Inspect the applicable part. (See ACTIVE AIR SHUTTER INSPECTION.)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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11
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INSPECT COOLING SYSTEM CAP FOR MALFUNCTION
• Inspect the applicable part. (See COOLING SYSTEM CAP INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See COOLING SYSTEM CAP INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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12
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INSPECT RELATED PART CONDITION
• Inspect the following:
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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13
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VERIFY IF MALFUNCTION CAUSED BY LACK OF ENGINE COOLANT
• Inspect the engine coolant level. (See ENGINE COOLANT LEVEL INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See ENGINE COOLANT LEVEL INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is there any malfunction?
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Yes
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Add engine coolant and verify that there is no engine coolant leakage.
• If there is any malfunction:
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No
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Go to the next step.
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14
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INSPECT DRIVE BELT
• Inspect the drive belt. (See DRIVE BELT INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See DRIVE BELT INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the indicator mark on the drive belt auto tensioner within the normal range?
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Yes
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Go to the next step.
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No
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Replace the drive belt and perform the repair completion verification.
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15
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INSPECT RADIATOR FOR CLOGGING
• Inspect for clogging in the radiator.
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Replace the engine coolant and perform the repair completion verification.
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Repair completion verification 1
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VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Has the malfunction symptom been eliminated?
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Yes
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Complete the symptom troubleshooting. (Explain contents of repair to customer)
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No
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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.
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Repair completion verification 2
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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?
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Yes
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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))].)
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No
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Replace the PCM.
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