NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [ZJ, ZY]
id0103b0802400
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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• Condenser fan system malfunction
• Cooling fan system malfunction
• Thermostat malfunction
• ECT sensor malfunction
• PCM malfunction
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Diagnostic procedure
STEP |
INSPECTION |
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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Remove the thermostat.
Inspect the thermostat.
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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Go to the next step.
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4
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Perform the Cooling Fan Control System Inspection.
Does the cooling fan control system work properly?
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Yes
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Perform the PID/DATA Monitor and Record Procedure and access the ECT PID.
Inspect for both the ECT PID and the temperature gauge readings.
• If the temperature gauge on the instrument cluster indicates normal range but ECT PID is not same as the temperature gauge reading:
• If the temperature gauge on the instrument cluster indicates overheating but 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 test results.
• If normal, return to diagnostic index to service any additional symptoms.
• If malfunction remains, inspect related Service information perform repair or diagnosis.
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