Component Description

The fuel tank temperature sensor (4) 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.

Fuel level sensor unit and fuel pump (1)
Fuel pressure regulator (2)
Fuel level sensor (3)

Fig 1: Identifying And Fuel Pump, Fuel Pressure Regulator, Fuel Tank Temperature Sensor And Fuel Level Sensor

Courtesy of NISSAN NORTH AMERICA, INC.

Fluid temperature [°C (°F)]

Voltage (V)⁽¹⁾

Resistance (kΩ)

20 (68)

3.5

2.3 - 2.7

50 (122)

2.2

0.79 - 0.90

⁽¹⁾	This data is reference values and is measured between ECM terminal 43 (Fuel tank temperature sensor) and ground.

Fig 2: Temperature And Resistance Characteristics Graph

Courtesy of NISSAN NORTH AMERICA, INC.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result damage the ECM's transistor. Use ground other than ECM, such as ground.