Test NTC-4A - Checking Coolant Sensor Calibration & Radiator Fan Operation
WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition on. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If ECT sensor temperature is more than 180°F (82°C), allow engine to cool until 150°F (66°C) is reached. Start engine. Allow engine to reach normal operating temperature of 180°F (82°C) or more. If ECT sensor value does not increase smoothly, inspect cooling system for mechanical failures. If there are no mechanical cooling system failures, replace ECT sensor. Perform TEST VER-2. If ECT sensor value increases smoothly, go to next step.
- If ECT sensor value does not reach 180°F (82°C) or more, inspect cooling system for mechanical failures. If there are no mechanical cooling system failures, replace ECT sensor. Perform TEST VER-2. If ECT sensor value reaches 180°F (82°C) or more, run engine until radiator fan operates or ECT sensor value reaches 220°F (104°C). If cooling fan does not operate, repair cooling system as necessary. Perform TEST VER-2. If cooling fan operates, system is functioning properly. Test is complete.