Test NTC-2: Checking Engine Coolant Temperature Sensor
- Turn ignition on with engine off. Using scan tool, read ENG COOLANT TMP DEG value. If engine coolant temperature is more than 180°F (82°C), allow engine to cool until engine coolant temperature is 150°F (66°C). Start engine. While monitoring engine coolant temperature, allow engine to warm to normal operating temperature, 180°F (82°C). If engine coolant temperature reached 180°F (82°C) or more, go to next step. If engine coolant temperature does not reach 180°F (82°C) or more, replace Engine Coolant Temperature (ECT) sensor. ECT sensor is screwed into end of cylinder head, just above the flywheel and contains Black/Light Blue wire and Tan/Black wires in the connector. See Fig 1. Perform TEST VER-5A .
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- Allow engine coolant temperature to cool to 150°F (66°C). Start engine. Using scan tool, read ENG COOLANT TMP DEG value. If ECT sensor value increased in a smooth transition, test is complete. If ECT sensor value does not increase in a smooth transition, replace ECT sensor. Perform TEST VER-5A .