Infiniti Q45. Manual - part 426

DTC P0181 FTT SENSOR

EC-343

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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

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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 

EC-154, "Ground Inspection"

 .

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