LOW ENGINE COOLANT TEMPERATURE INDICATOR LIGHT/HIGH ENGINE COOLANT TEMPERATURE WARNING LIGHT ILLUMINATES OR FLASHES CONTINUOUSLY [INSTRUMENT CLUSTER]
id0903d5013300
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Item
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Low engine coolant temperature indicator light/high engine coolant temperature warning light illuminates or flashes continuously
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Possible Causes
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• ECT sensor malfunction
• Instrument cluster malfunction
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Diagnostic Procedure
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Step |
Inspection |
Action |
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1
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PERFORM CAN MALFUNCTION DIAGNOSIS AND DTC INSPECTION
• Perform the CAN malfunction diagnosis according to the recommendation of FOREWORD [INSTRUMENT CLUSTER] malfunction diagnosis, and if there is no CAN malfunction, perform inspection for DTCs.
• Is the DTC displayed?
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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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2
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VERIFY THE MALFUNCTION SYMPTOM
• Cool down the engine.
• When the ignition is switched ON, does the engine coolant temperature warning light illuminate or flash?
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Yes
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Go to Step 4.
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No
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Go to the next step.
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3
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VERIFY ILLUMINATION OF LOW ENGINE COOLANT TEMPERATURE INDICATOR LIGHT
• Start the engine.
• Monitor the PID ECT using the M-MDS.
• Verify that the low engine coolant temperature indicator light illuminates when the ECT monitor value is 55 °C {131 °F} or more.
• Does the low engine coolant temperature indicator light illuminate?
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Yes
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Go to the next step.
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No
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The system is operating normally.
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4
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INSPECT ECT SENSOR
• Inspect the ECT sensor.
• Is the ECT sensor normal?
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Yes
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Replace the instrument cluster.
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No
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Replace the ECT sensor.
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