P0181 FTT Sensor: Description

WARNING: This page is about a different car, the 2008 Infiniti EX35. However, it is still accessible from the selected car via links, so may be relevant.

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 >

Fig 1: Resistance And Temperature Graph

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

FLUID TEMPERATURE SPECIFICATIONS

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⁾	These data are reference values and are measured between ECM terminals 106 (Fuel tank temperature sensor) and 128 (sensor ground).