Test NTC-2: Checking Engine Coolant Temperature Sensor Calibration
- Turn ignition on with engine off. Using scan tool, read Engine Coolant Temperature (ECT) sensor value to indicate the engine coolant temperature. If engine coolant temperature is 180°F (82°C) or less, go to next step. If engine coolant temperature is more than 180°F (82°C), allow engine to cool until engine coolant temperature is 150°F (66°C). Go to next step.
- Start engine. Using scan tool, monitor ECT sensor value while operating engine until engine until engine coolant temperature is more than 180°F (82°C). 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 after inspecting cooling system for any problems. ECT sensor is located on coolant housing at flywheel end of the cylinder heads, just below coolant filler neck with coolant pressure cap and contains a Black/Light Blue wire and a Tan/Black wire in the connector. Perform TEST VER-2A .