NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [MZR 2.0 DISI i-stop]
id0103d3802400
18 |
COOLING SYSTEM CONCERNS-RUNS COLD |
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DESCRIPTION
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• Engine does not reach normal operating temperature.
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POSSIBLE CAUSE
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• Condenser fan system malfunction
• Thermostat malfunction
• Cooling fan system malfunction
• Improper indication of low engine coolant temperature indicator light and/or high engine coolant temperature warning light
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Diagnostic procedure
STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Is a customer complaint “Lack of passenger compartment heat” only?
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Yes
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Inspect the A/C 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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Perform 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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Perform the Cooling Fan Control System Inspection.
Does the cooling fan control 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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4
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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, then go to the next step.
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5
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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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6
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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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