Altima 2.5 SL L4-2.5L (QR25DE) (2002)
Temperature Sensor (Gauge): Description and Operation
ECT SENSOR
Component Description
The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The
modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature.
The electrical resistance of the thermistor decreases as temperature increases.
Reference Data
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a
ground other than ECM terminals, such as the ground.