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Test NTC-4A - Checking Coolant Sensor Calibration

NOTE: Perform TEST NTC-1A or NTC-3A before proceeding.
  1. Turn ignition on. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If engine operating temperature is more than 180°F (82°C), allow engine to cool to 150°F (66°C). Start engine. While monitoring scan tool, allow engine to reach normal operation temperature of more than 180°F (82°C). Go to next step.
  2. If ECT sensor value increased in a smooth transition, go to next step. If ECT sensor value did not increase in a smooth transition, verify engine cooling system is not malfunctioning. If engine cooling system is malfunctioning, repair as necessary. Perform TEST VER-2A. If engine cooling system is not malfunctioning, replace ECT sensor. Perform TEST VER-2A.
  3. If engine coolant temperature reached 180°F (82°C) or more, cooling system is functioning properly. Test is complete. If engine coolant temperature did not reach 180°F (82°C) or more, verify engine cooling system is not malfunctioning. If engine cooling system is malfunctioning, repair as necessary. Perform TEST VER-2A. If engine cooling system is not malfunctioning, replace ECT sensor. Perform TEST VER-2A.
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