Infiniti F50. Manual - part 411

DTC P0181 FTT SENSOR

EC-285

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EC

Diagnostic Procedure

EBS00MCY

1. 

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 ter-
minal 4 and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

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 harness or connector.

3. 

CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch “OFF”.

2.

Check harness continuity between fuel level sensor unit and fuel pump terminal 2 and body ground.
Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

PBIB1249E

Voltage: Approximately 5V

PBIB0316E

Continuity should exist.

EC-286

DTC P0181 FTT SENSOR

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors B211, M141

●

Harness connectors M135, F105

●

Joint connector-30

●

Harness for open or short between ECM and fuel level sensor unit and fuel pump

>> Repair open circuit or short to power in harness or connector.

5. 

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-286, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Replace fuel level sensor unit.

6. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

EBS00MCZ

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

EBS00MD0

FUEL TANK TEMPERATURE SENSOR

Refer to 

FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY"

 .

Temperature 

°

C (

°

F)

Resistance k

Ω

20 (68)

2.3 - 2.7

50 (122)

0.79 - 0.90

PBIB0200E

DTC P0182, P0183 FTT SENSOR

EC-287

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EC

DTC P0182, P0183 FTT SENSOR

PFP:22630

Component Description

EBS00MD1

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>

*: These data are reference values and are measured between ECM terminal 92
(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

EBS00MD2

DTC Confirmation Procedure

EBS00MD3

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-289, "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

EC-288

DTC P0182, P0183 FTT SENSOR

Wiring Diagram

EBS00MD4

TBWM0153E