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.

Fig 1: Locating Fuel Level Sensor Unit & Fuel Pump Harness Connector

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

< Reference data >

REFERENCE DATA

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.

Fig 2: DTC P0181 FTT Sensor - 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 in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Fig 3: DTC P0181 FTT Sensor - On Board Diagnosis Logic

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