NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [MZR 2.0 DISI i-stop]
id0103d3802300
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17 |
COOLING SYSTEM CONCERNS-OVERHEATING |
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DESCRIPTION
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• Engine runs at higher than normal temperature/overheats.
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POSSIBLE CAUSE
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• Improper coolant level
• Coolant leakage (engine internal, external)
• Improper water/anti-freeze mixture
• Poor radiator condition
• Radiator hose damage
• Improper or damaged radiator cap
• Coolant overflow system malfunction
• Fans reverse rotation
• Blown fuse
• PCM DTC is stored.
• Improper operation of A/C system
• Cooling fan inoperative
• Drive belt damage
• Improper drive belt tension
• Leakage around heater unit in passenger compartment
• Leakage at coolant hoses and/or radiator
• Thermostat malfunction
• Improper indication of low engine coolant temperature indicator light and/or high engine coolant temperature warning light
• Excessive A/C system pressure
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Diagnostic procedure
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STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Inspect for the following:
• Engine coolant level
• Coolant leakage (around heater unit in passenger compartment, coolant hoses and/or radiator.)
• Water and anti-freeze mixture
• Radiator condition
• Collapsed or restricted radiator hoses
• Radiator pressure cap
• Coolant overflow system
• Fan rotational direction
• Fuses
Is there any malfunction?
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Yes
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Service if necessary.
• Repeat this step.
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No
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Go to the next step.
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2
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Connect the M-MDS to the DLC-2.
Switch the ignition to ON (engine off).
Retrieve any DTCs using the M-MDS.
Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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Go to the next step.
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3
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Perform the KOEO/KOER self test.
Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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Go to the next step.
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4
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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 “NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY”.
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5
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Perform the Cooling Fan Control System Inspection.
Does the cooling fan system operate properly?
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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 part according to the inspection results.
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6
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Inspect the drive belt.
Is there any malfunction?
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Yes
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Replace the drive belt.
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No
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Go to the next step.
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7
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Inspect for leakage around heater unit in passenger compartment.
Is there any leakage?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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8
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Inspect for leakage at coolant hoses and/or radiator.
Is there any leakage?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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9
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Access the ECT PID using the M-MDS.
Compare the ECT PID and low engine coolant temperature indicator light and high engine coolant temperature warning light operation.
Is the ECT PID value same as indicator/warning light readings?
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Yes
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Go to the next step.
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No
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Inspect the ECT sensor.
• If there is any malfunction:
• If there is no malfunction:
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10
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Cool down the engine.
Remove the thermostat.
Inspect the thermostat operation.
Is there any malfunction?
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Yes
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Replace the thermostat.
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No
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Reinstall the thermostat.
The engine coolant temperature and thermostat are normal.
• Inspect the engine block for leakage or blockage.
• Repair or replace the malfunctioning part according to the inspection results.
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11
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Verify the test results.
• If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZR 2.0 DISI i-stop].)
• If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
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