DTC P0116: Engine Coolant Temperature Circuit Range/Performance: Operation
A 5-volt voltage is applied to the ECT sensor output terminal (terminal No. 1) from the PCM (terminal No. 44) via the resistor in the PCM. The ground terminal (terminal No. 2) is grounded with 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 ECT sensor output voltage increases when the resistor increases, and decreases when the resistor decreases. See Fig 1 .