Infiniti M35/M45 Y50. Manual - part 465

DTC P0181 FTT SENSOR

EC-333

[VQ35DE]

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Wiring Diagram

NBS004Y3

TBWT1531E

EC-334

[VQ35DE]

DTC P0181 FTT SENSOR

Diagnostic Procedure

NBS004Y4

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws on the body.
Refer to 

EC-160, "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-31, "SELF-DIAG RESULTS"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Go to 

DI-22, "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 (1).

–

Illustration shows the view with rear seat cushion and inspection
hole cover (RH) removed.

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: Vehicle front

3.

Turn ignition switch ON.

4.

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 5.

NG

>> GO TO 4.

1.

Body ground M70

2.

Body ground M16

PBIB2782E

PBIB2706E

Voltage: Approximately 5V

PBIB0932E

DTC P0181 FTT SENSOR

EC-335

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4. 

DETECT MALFUNCTIONING PART

Check the following.

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Harness connectors M66, B418

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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.

3.

Check harness continuity between “fuel level sensor unit and fuel pump” terminal 5 and “unified meter and
A/C amp.” terminal 58. 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 M66, B418

●

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-336, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Replace “fuel level sensor unit and fuel pump”.

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-153, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

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>> INSPECTION END

Continuity should exist.

EC-336

[VQ35DE]

DTC P0181 FTT SENSOR

Component Inspection

NBS004Y5

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

NBS004Y6

FUEL TANK TEMPERATURE SENSOR

Refer to 

FL-4, "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

PBIB0931E