Infiniti Q45. Manual — part 425
DTC P0181 FTT SENSOR
EC-339
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EC
DTC P0181 FTT SENSOR
PFP:22630
Component Description
NBS001VE
The fuel tank temperature sensor is used to detect the fuel tempera-
ture inside the fuel tank. The sensor modifies a voltage signal from
the ECM. The modified signal returns to the ECM as the fuel temper-
ature 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>
*: This data is reference value and is measured between ECM terminal 107 (Fuel
tank temperature sensor) and 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
NBS001VF
DTC Confirmation Procedure
NBS001VG
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.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Wait at least 10 seconds.
If 1st trip DTC is detected, go to
EC-342, "Diagnostic Procedure"
.
If 1st trip DTC is not detected, go to following step.
4.
Check “COOLAN TEMP/S” value.
If “COOLAN TEMP/S” is less than 60
°
C (140
°
F), the result will
be OK.
If “COOLAN TEMP/S” is above 60
°
C (140
°
F), go to the following
step.
5.
Cool engine down until “COOLAN TEMP/S” is less than 60
°
C (140
°
F).
6.
Wait at least 10 seconds.
7.
If 1st trip DTC is detected, go to
EC-342, "Diagnostic Procedure"
PBIB1249E
Fluid temperature
°
C (
°
F)
Voltage*
V
Resistance
k
Ω
20 (68)
3.5
2.3 - 2.7
50 (122)
2.2
0.79 - 0.90
SEF012P
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 sig-
nals from engine coolant temperature sensor
and intake air temperature sensor.
●
Harness or connectors
(The sensor circuit is open or shorted)
●
Fuel tank temperature sensor
SEF174Y
EC-340
DTC P0181 FTT SENSOR
WITH GST
Follow the procedure WITH CONSULT-II above.
DTC P0181 FTT SENSOR
EC-341
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Wiring Diagram
NBS001VH
TBWM0547E
EC-342
DTC P0181 FTT SENSOR
Diagnostic Procedure
NBS001VI
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten three ground screws on the body.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
2.
Turn ignition switch ON.
3.
Check voltage between “fuel level sensor unit and fuel pump”
terminal 4 and ground with CONSULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors B211, M141
●
Harness connectors M135, F105
●
Harness for open or short between ECM and “fuel level sensor unit and fuel pump”
>> Repair open circuit or short to ground or short to power in harness or connector.
PBIB2417E
PBIB1249E
Voltage: Approximately 5V
PBIB0316E
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