Nissan Xterra. Instruction - part 281

EC-250

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P0181 FTT SENSOR

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”

terminal 4 and ground with CONSULT or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E41, C1

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

>> Repair harness or connector.

5.

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 3 and ground. Refer to

Wiring Diagram.

3. Also check harness for short to power.
OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E41, C1

• Harness for open or short between “fuel level sensor unit and fuel pump” and ground

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

7.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-250, "Component Inspection"

.

OK or NG

OK

>> GO TO 8.

NG

>> Replace fuel level sensor unit. Refer to 

FL-11, "Removal and Installation"

.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009483950

FUEL TANK TEMPERATURE SENSOR

1. Remove fuel level sensor unit. Refer to 

FL-11, "Removal and Installation"

.

Voltage: Approximately 5V

BBIA0545E

Continuity should exist.

P0181 FTT SENSOR

EC-251

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2. Check resistance between “fuel level sensor unit and fuel pump”

terminals 3 and 4 by heating with hot water or heat gun as

shown in the figure.

Temperature [

°C (°F)]

Resistance (k

Ω)

20 (68)

2.3 - 2.7

50 (122)

0.79 - 0.90

JMBIA0167ZZ

EC-252

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P0182, P0183 FTT SENSOR

P0182, P0183 FTT SENSOR

Component Description

INFOID:0000000009483951

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 111 (fuel tank
temperature sensor) and ground.

CAUTION:

Never 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

INFOID:0000000009483952

DTC Confirmation Procedure

INFOID:0000000009483953

1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-

ducting the next step.

a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c.

Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON and wait at least 5 seconds.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to 

EC-252, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009483954

1.

CHECK COMBINATION METER FUNCTION

Refer to 

GI-36, "Work Flow"

.

OK or NG

OK

>> GO TO 2.

NG

>> Go to 

MWI-33, "Component Function Check"

.

BBIA0545E

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.

P0182, P0183 FTT SENSOR

EC-253

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2.

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” terminal 4 and ground with CONSULT or

tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E41, C1

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

>> Repair harness or connector.

4.

CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect combination meter harness connector.

3. Check harness continuity between “fuel level sensor unit and fuel pump” terminal 3 and ground. 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 E41, C1

• Harness for open or short between “fuel level sensor unit and fuel pump” and ground

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

6.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-254, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

NG

>> Replace fuel level sensor unit. Refer to 

FL-11, "Removal and Installation"

.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

BBIA0545E

Voltage: Approximately 5V

Continuity should exist.