Component Description

The fuel tank temperature sensor (3) 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)

Fig 1: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector

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

< Reference data >

VOLTAGE SPECIFICATION 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 value and is measured between ECM terminal 107 (Fuel tank temperature sensor) and ground.

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.

Fig 2: Fuel Tank Temperature Sensor Resistance Graph

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