DTC P0116: Engine Coolant Temperature Circuit Range/Performance Problem: Operation
A 5-volt reference voltage is applied to the ECT sensor output terminal (terminal No. 1) from the ECM (terminal No. 83 - M/T) or PCM (terminal No. 44) via the resistor in the ECM (M/T) or PCM (A/T). The ground terminal (terminal No. 2) is grounded with ECM (terminal No. 92 - M/T) or PCM (terminal No. 57). The ECT sensor is a negative temperature coefficient type of resistor. It has the characteristic that when the engine coolant temperature rises the resistor decreases. The engine coolant temperature sensor output voltage increases when resistor increases and decreases when resistor decreases.