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 Fuel Pump, Fuel Pressure Regulator, Fuel Level Sensor And Fuel Tank Temperature Sensor
Courtesy of NISSAN MOTOR CO., U.S.A.

< Reference data >

RESISTANCE AND VOLTAGE REFERENCE CHART

Fluid temperature °C (°F)

Voltage⁽¹⁾ V

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: Engine Coolant Temperature Resistance Graph

Courtesy of NISSAN MOTOR CO., U.S.A.

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.