Infiniti Q45. Manual — part 426
DTC P0181 FTT SENSOR
EC-343
C
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A
EC
4.
CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between “fuel level sensor unit and fuel pump” terminal 2 and ECM terminal 67.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
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.
6.
CHECK FUEL TANK TEMPERATURE SENSOR
Refer to
EC-343, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> Replace fuel level sensor unit.
7.
CHECK INTERMITTENT INCIDENT
Refer to
EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
Component Inspection
NBS001VJ
FUEL TANK TEMPERATURE SENSOR
1.
Remove fuel level sensor unit.
2.
Check resistance between “fuel level sensor unit and fuel pump”
terminals 4 and 2 by heating with hot water or heat gun as
shown in the figure.
Removal and Installation
NBS001VK
FUEL TANK TEMPERATURE SENSOR
Refer to
FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY"
Continuity should exist.
Temperature
°
C (
°
F)
Resistance k
Ω
20 (68)
2.3 - 2.7
50 (122)
0.79 - 0.90
PBIB0200E
EC-344
DTC P0182, P0183 FTT SENSOR
DTC P0182, P0183 FTT SENSOR
PFP:22630
Component Description
NBS001VL
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
NBS001VM
DTC Confirmation Procedure
NBS001VN
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 5 seconds.
4.
If 1st trip DTC is detected, go to
EC-346, "Diagnostic Procedure"
.
WITH GST
Follow the procedure With CONSULT-II above.
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
P0182
0182
Fuel tank temperature
sensor circuit low input
An excessively low voltage from the sensor is
sent to ECM.
●
Harness or connectors
(The sensor circuit is open or shorted.)
●
Fuel tank temperature sensor
P0183
0183
Fuel tank temperature
sensor circuit high input
An excessively high voltage from the sensor is
sent to ECM.
SEF174Y
DTC P0182, P0183 FTT SENSOR
EC-345
C
D
E
F
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M
A
EC
Wiring Diagram
NBS001VO
TBWM0547E
EC-346
DTC P0182, P0183 FTT SENSOR
Diagnostic Procedure
NBS001VP
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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