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SEC082D
Component Description
NFEC0773
The fuel tank temperature sensor is used to detect the fuel tem-
perature 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 ther-
mistor decreases as temperature increases.
SEF012P
<Reference data>
Fuel temperature
°C (°F)
Voltage* V Resistance kΩ
20 (68) 3.5 2.3 - 2.7
50 (122) 2.2 0.79 - 0.90
*: These data are reference values and are measured between ECM terminal 75
(Fuel tank temperature sensor) and body 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.
On Board Diagnosis Logic
NFEC0774
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P0181
0181
Fuel tank temperature
sensor circuit range/
performance
Rationally incorrect voltage from the sensor is sent
to ECM, compared with the voltage signals from
engine coolant temperature sensor and intake air
temperature sensor.
I Harness or connectors
(The sensor circuit is open or
shorted.)
I Fuel tank temperature sensor
DTC Confirmation Procedure
NFEC0776
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
DTC P0181 FTT SENSOR
Component Description
EC-282
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