Nissan Frontier D22. Manual - part 284

DTC P0181 FTT SENSOR

EC-239

[KA24DE]

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EC

DTC P0181 FTT SENSOR

PFP:22630

Component Description

UBS00D5A

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 ECM terminals, such as the ground.

On Board Diagnosis Logic

UBS00D5B

DTC Confirmation Procedure

UBS00D5C

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 1st trip DTC is detected, go to 

EC-242, "Diagnostic Procedure"

.
If 1st trip DTC is not detected, go to following step.

4.

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

°C (140°F), the result will be OK.

If the indication is above 60

°C (140°F), go to the following step.

5.

Cool engine down until “COOLAN TEMP/S” indication
decreases to less than 60

°C (140°F).

6.

Wait at least 10 seconds.

7.

If 1st trip DTC is detected, go to 

EC-242, "Diagnostic Procedure"

 .

SEF334VA

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-240

[KA24DE]

DTC P0181 FTT SENSOR

 WITH GST

Follow the procedure “WITH CONSULT-II”.

DTC P0181 FTT SENSOR

EC-241

[KA24DE]

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EC

Wiring Diagram

UBS00D5D

BBWA1059E

EC-242

[KA24DE]

DTC P0181 FTT SENSOR

Diagnostic Procedure

UBS00D5E

1. 

CHECK POWER SUPPLY

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 terminal 2 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

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Harness connectors M81, F36

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

>> Repair harness or connector.

3. 

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check harness continuity between terminal 4 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.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors C1, M67

●

Harness for open or short between ECM and body ground

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

SEF334VA

Voltage

: Approximately 5V

SEF850Z

Continuity should exist.