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

Refer to 

EC-297, "Component Inspection"

.

OK or NG

OK

>> GO TO 8.

NG

>> Replace fuel level sensor unit.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-139

.

>> 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

Refer to 

FL-4

.

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

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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 

EC-299, "Diagnosis Procedure"

.

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 >

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Wiring Diagram

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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 

EC-144, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK DTC WITH “UNIFIED METER AND A/C AMP.”

Refer to 

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