FTS(Fuel Temperature Sensor) located in the engine fuel passage from the fuel tank.
It detects the fuel temperature and relays signals to the ECM.
It employs a thermistor, which is sensitive to changes in the fuel temperature.
The electric resistance of a thermistor decreases as the temperature increases, and increases as the temperature decreases.
The power source in the ECM is supplied to the FTS via a resistor in the ECM.
It is used during injection control strategies that make corrections depending on the fuel temperature and in order to protect the system in event of excessive fuel temperature.
In case of more than FTS 120°C, the engine symptom generates the power loss or poor acceleration.
If the signal is above threshold value, the ECM judged this as a fault and DTC is set.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Signal check, high
? Short to ground in signal circuit
? Open in ground circuit
? Faulty FTS
? Faulty ECM
Enable Conditions
? Ignition on
Threshold Value
? Output signal > 4.9V
Diagnostic Time
? 0.48 sec.
MIL
Fuel Limit
Fuel Cut
EGR Off
? No
? Yes
Fail safe
? Engine fuel temperature is fixed at value of 60°C by ECM.
IATS
Temperature (°C)
20
40
60
Resistance (k?)
2.27 ~ 2.73
1.06 ~ 1.28
0.54 ~ 0.65