Infiniti FX35 / FX45. Manual — part 384
DTC P0181 FTT SENSOR
EC-297
< SERVICE INFORMATION >
[VQ35DE]
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5.
CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect “unified meter and A/C amp.” harness connector.
3.
Check harness continuity between “fuel level sensor unit and fuel pump” terminal 5 and “unified meter and
A/C amp.” terminal 36. Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B1, M11
• Harness for open or short between “fuel level sensor unit and fuel pump” and “unified meter and A/C amp.”
>> Repair open circuit or short to ground or short to power in harness or connector.
7.
CHECK FUEL TANK TEMPERATURE SENSOR
EC-297, "Component Inspection"
OK or NG
OK
>> GO TO 8.
NG
>> Replace fuel level sensor unit.
8.
CHECK INTERMITTENT INCIDENT
>> INSPECTION END
Component Inspection
INFOID:0000000001326114
FUEL TANK TEMPERATURE SENSOR
1.
Remove fuel level sensor unit.
2.
Check resistance between “fuel level sensor unit and fuel pump”
terminals 4 and 5 by heating with hot water as shown in the fig-
ure.
If NG, replace fuel level sensor unit.
Removal and Installation
INFOID:0000000001326115
FUEL TANK TEMPERATURE SENSOR
Continuity should exist.
Temperature
°
C (
°
F)
Resistance k
Ω
20 (68)
2.3 - 2.7
50 (122)
0.79 - 0.90
PBIB0931E
EC-298
< SERVICE INFORMATION >
[VQ35DE]
DTC P0182, P0183 FTT SENSOR
DTC P0182, P0183 FTT SENSOR
Component Description
INFOID:0000000001326116
The fuel tank temperature (FTT) sensor is used to detect the fuel
temperature inside the fuel tank. The sensor modifies a voltage sig-
nal from the ECM. The modified signal returns to the ECM as the
fuel temperature input. The sensor uses a thermistor which is sensi-
tive to the change in temperature. The electrical resistance of the
thermistor decreases as temperature increases.
<Reference data>
*: This data is reference values 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
INFOID:0000000001326117
DTC Confirmation Procedure
INFOID:0000000001326118
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.
1.
Turn ignition switch ON and wait at least 5 seconds.
2.
Check 1st trip DTC.
3.
If 1st trip DTC is detected, go to
PBIB1572E
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
(Fuel tank temperature sensor circuit is
open or shorted.)
• Fuel tank temperature sensor
• Unified meter and A/C amp.
P0183
0183
Fuel tank temperature
sensor circuit high input
An excessively high voltage from the sensor is
sent to ECM.
DTC P0182, P0183 FTT SENSOR
EC-299
< SERVICE INFORMATION >
[VQ35DE]
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Wiring Diagram
INFOID:0000000001326119
Diagnosis Procedure
INFOID:0000000001326120
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
TBWM1386E
EC-300
< SERVICE INFORMATION >
[VQ35DE]
DTC P0182, P0183 FTT SENSOR
2.
Loosen and retighten ground screw on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
DI-27, "CONSULT-III Function (METER/M&A)"
OK or NG
OK
>> GO TO 3.
NG
>> Go to
DI-19, "Fuel Level Sensor Signal Inspection"
3.
CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
3.
Turn ignition switch ON.
4.
Check voltage between “fuel level sensor unit and fuel pump”
terminal 4 and ground with CONSULT-III or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B1, M11
• 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.
5.
CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect “unified meter and A/C amp.” harness connector.
PBIB2625E
PBIB1572E
Voltage: Approximately 5V
PBIB0932E
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