Fuel System - Fuel Temperature Sensor
SOURCE: Hyundai Tech Net Times Volume 13 Issue 3 2003TITLE: Fuel Temperature Sensor
APPLIES TO: Sonata, four-cylinder engine, Santa Fe four-cylinder engine, and the 2003 XG350
SERVICE TIP:
A Fuel Temperature Sensor has been introduced in some 2003 models
The Fuel Temp Sensor (FTS) is installed in the Sonata, four-cylinder engine, Santa Fe four-cylinder engine, and the 2003 XG350. It may be installed in other models in the future as well.
The FTS is located inside the fuel tank, and is part of the fuel pump assembly. The sensor measures the fuel temperature and the ECM uses this information in monitoring the EVAP system. It's used by the ECM to compensate for the differential vapor pressure due to a temperature change. It enhances the ECM to correctly detect a leak in the EVAP system
Codes related to the FTS:
P0181: Rationality check. Fuel temperature and coolant temperature differ by more than 60�F on start up.
P0182: Sensor is shorted or signal voltage is low.
P0183: Sensor is open or signal voltage is high. The most likely cause of a code, is a sensor connector not completely connected.
The FTS is a positive temperature coefficient thermistor type, changing resistance with temperature, thus causing the sensor voltage to increase or decrease with temperature.
To test the FTS, immerse the sensor in fluid at a specified temperature, and measure the resistance.
Resistance specs (k) ohms:
-20�C (-4� f) = 14.3 - 15.9
0� C (32�f) = 5.5 - 5.8
20� C (68�f) = 2.3 - 2.4
60� C (140�f) = 0.5 - 0.6
Part numbers for the FTS:
Santa Fe: 31435-26300
Sonata: 31435-38300
XG 350: From 10/01/ 02 to 10/18/02 31435-3B500
XG 350: From 10/19/02 to present 31435-38300