Nissan Frontier D22. Manual - part 585

DTC P0181 FTT SENSOR

EC-1443

[VG33ER]

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EC

DTC P0181 FTT SENSOR

PFP:22630

Component Description

UBS00DW7

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 60
(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 the ECM terminals, such as the ground.

On Board Diagnosis Logic

UBS00DW8

DTC Confirmation Procedure

UBS00DW9

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 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 10 seconds.
If the result is NG, go to 

EC-1446, "Diagnostic Procedure"

 .

If the result is OK, go to following step.

4.

Check “COOLAN TEMP/S” value.
If “COOLAN TEMP/S” is less than 60

°C (140°F), the result will

be OK.
If “COOLAN TEMP/S” is above 60

°C (140°F), go to the following

step.

5.

Cool engine down until “COOLAN TEMP/S” is less than 60

°C

(140

°F).

6.

Wait at least 10 seconds.

7.

If 1st trip DTC is detected, go to 

EC-1446, "Diagnostic Procedure"

 .

LEC764

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

P0181

Fuel tank temperature 
sensor circuit range/
performance

Rationally incorrect voltage from the sensor is 
sent to ECM, compared with the voltage sig-
nals from engine coolant temperature sensor 
and intake air temperature sensor.

●

Harness or connectors
(The sensor circuit is open or shorted)

●

Fuel tank temperature sensor

SEF174Y

EC-1444

[VG33ER]

DTC P0181 FTT SENSOR

 WITH GST

Follow the procedure “WITH CONSULT-II”. 

DTC P0181 FTT SENSOR

EC-1445

[VG33ER]

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EC

Wiring Diagram

UBS00DWA

BBWA1084E

EC-1446

[VG33ER]

DTC P0181 FTT SENSOR

Diagnostic Procedure

UBS00DWB

1. 

CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect fuel level sensor unit harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between fuel level sensor unit terminal T 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 C1, M67

●

Harness connectors M81, F36

●

Harness for open or short between ECM and fuel tank temperature sensor

>> 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 terminal E and body ground. Refer to Wiring Dia-
gram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors C1, M67.

●

Harness for open between fuel tank temperature sensor and body ground.

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

LEC764

Voltage: Approximately 5V

SEC310C

Continuity should exist.