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Home >> Chevrolet >> 1999 >> Tracker 4D Utility, 4WD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P0116: Engine Coolant Temperature (ECT) Sensor Circuit Performance >> Circuit Description

Circuit Description

ECT sensor is a thermistor in series with a fixed resistor in PCM. PCM applies 5 volts to ECT sensor. PCM monitors voltage across ECT sensor and converts it into a temperature reading. When coolant temperature is cold, ECT sensor resistance is high (PCM monitors high voltage input). When coolant temperature is warm, ECT sensor resistance is low (PCM monitors low voltage input).

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