NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [LF, L5]
id010397802400
18 |
COOLING SYSTEM CONCERNS-RUNS COLD |
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DESCRIPTION
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• The engine does not reach normal operating temperature.
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POSSIBLE CAUSE
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• Thermostat malfunction
• Cooling fan system malfunction
• PCM malfunction
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Diagnostic procedure
STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Is the customer complaint “Lack of passenger compartment heat” only?
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Yes
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Inspect the A/C and heater system.
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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2
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Does the engine speed continue at fast idle?
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Yes
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Go to the symptom troubleshooting “NO.9 FAST IDLE/RUNS ON”.
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No
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Go to the next step.
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3
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Cool down the engine.
Remove the thermostat and inspect operation.
Is the thermostat normal?
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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 thermostat.
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4
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Perform the Cooling Fan Control System Inspection.
Does the cooling fan control system function properly?
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Yes
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Access the ECT PID using the M-MDS.
Inspect for both the ECT PID and the low engine coolant temperature indicator light condition.
• If the low engine coolant temperature indicator light on the instrument cluster turns off but the ECT PID is not same as the low engine coolant temperature indicator light condition:
• If the low engine coolant temperature indicator light on the instrument cluster indicates overheating but the ECT PID is normal:
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No
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Repair or replace the malfunctioning part according to the inspection results.
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5
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• Verify the test results.
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