Altima 2.5 SL L4-2.5L (QR25DE) (2002)
Fuel Temperature Sensor: Description and Operation
FTT SENSOR
Component Description
The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the ECM. The
modified signal returns to the ECM as the fuel 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 lead to ECM's transistor damage. Use ground other
than ECM, such as engine ground.