Nissan Sentra. Manual - part 390

EC-256

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P0181 FTT SENSOR

4. Check resistance between fuel level sensor unit and fuel pump

terminals by heating with hot water as shown in the figure.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Proceed to 

EC-256, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009758504

1.

INSPECTION START

Confirm the detected malfunction (A or B). Refer to 

EC-254, "DTC Logic"

.

Which malfunction is detected?

A

>> GO  TO  2.

B

>> GO  TO  6.

2.

CHECK DTC WITH COMBINATION METER

Check DTC with combination meter. Refer to 

MWI-17, "CONSULT Function (METER/M&A)"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Proceed to 

MWI-58, "Diagnosis Procedure"

.

3.

CHECK FUEL TANK TEMPERATURE (FTT) SENSOR POWER

1. Turn ignition switch OFF.

2. Disconnect fuel level sensor unit and fuel pump harness connector.

3. Turn ignition switch ON.

4. Check the voltage between fuel level sensor unit and fuel pump harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK FUEL TANK TEMPERATURE (FTT) SENSOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between fuel level sensor unit and fuel pump harness connector and ECM harness

connector.

4. Also check harness for short to ground and to power.

Fuel level sensor unit 

and fuel pump

Condition

Resistance (k

Ω)

+

−

Terminal

4

 

5

Temperature [

°C 

(

°F)]

20 (68)

2.3 – 2.7

50 (122)

0.79 – 0.90

JMBIA0167ZZ

+

−

Voltage

(Approx.)

Fuel level sensor unit and fuel pump

Connector

Terminal

B48

4

Ground

 5 V

+

-

Continuity

Fuel level sensor unit and 

fuel pump

ECM

Connector

Terminal

Connector

Terminal

B48

4

E16

125

Existed

P0181 FTT SENSOR

EC-257

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

5.

CHECK FTT SENSOR GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between fuel level sensor unit and fuel pump harness connector and ECM harness

connector.

4. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK FUEL TANK TEMPERATURE (FTT) SENSOR

Check the FTT sensor. Refer to 

EC-257, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Replace fuel level sensor unit and fuel pump. Refer to 

FL-6, "Removal and Installation"

.

Component Inspection

INFOID:0000000009758505

1.

CHECK FUEL TANK TEMPERATURE (FTT) SENSOR

1. Turn ignition switch OFF.

2. Disconnect fuel level sensor unit and fuel pump harness connector.

3. Remove fuel level sensor unit. Refer to 

FL-6, "Removal and Installation"

.

4. Check resistance between fuel level sensor unit and fuel pump

terminals by heating with hot water as shown in the figure.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace fuel level sensor unit and fuel pump. Refer to 

FL-6, "Removal and Installation"

.

+

-

Continuity

Fuel level sensor unit and 

fuel pump

ECM

Connector

Terminal

Connector

Terminal

B48

5

E16

124

Existed

Fuel level sensor unit 

and fuel pump 

Condition

Resistance (k

Ω)

+

−

Terminal

4

5

Temperature 
[

°C (°F)]

20 (68)

2.3 – 2.7

50 (122)

0.79 – 0.90

JMBIA0167ZZ

EC-258

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P0182, P0183 FTT SENSOR

P0182, P0183 FTT SENSOR

DTC Logic

INFOID:0000000009758506

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next test. 

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 5 seconds.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-258, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009758507

1.

CHECK DTC WITH COMBINATION METER

Refer to 

MWI-17, "CONSULT Function (METER/M&A)"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Proceed to 

MWI-58, "Diagnosis Procedure"

.

2.

CHECK FUEL TANK TEMPERATURE (FTT) SENSOR POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect fuel level sensor unit and fuel pump harness connector.

3. Turn ignition switch ON.

4. Check the voltage between fuel level sensor unit and fuel pump harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0182

FTT SEN/CIRCUIT
(Fuel temperature sensor 
″A″ circuit low)

An excessively low voltage from the sensor is 
sent to ECM.

• Harness or connectors

(The FTT sensor circuit is open or 
shorted.)

• Fuel tank temperature sensor
• Combination meter

P0183

FTT SEN/CIRCUIT
(Fuel temperature sensor 
″A″ circuit high)

An excessively high voltage from the sensor is 
sent to ECM.

+

−

Voltage

(Approx.)

Fuel level sensor unit and fuel 

pump

Connector

Terminal

B48

4

Ground

5 V

P0182, P0183 FTT SENSOR

EC-259

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

3.

CHECK FUEL TANK TEMPERATURE (FTT) SENSOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between fuel level sensor unit and fuel pump harness connector and ECM harness

connector.

4. Also check harness for short to ground and to power.
Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

4.

CHECK FUEL TANK TEMPERATURE (FTT) SENSOR GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM connector.

3. Check the continuity between fuel level sensor unit and fuel pump harness connector and ECM harness

connector.

4. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK FUEL TANK TEMPERATURE (FTT) SENSOR

Check the FTT sensor. Refer to 

EC-259, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

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

FL-6, "Removal and Installation"

.

Component Inspection

INFOID:0000000009758508

1.

CHECK FUEL TANK TEMPERATURE (FTT) SENSOR

1. Turn ignition switch OFF.

2. Disconnect fuel level sensor unit and fuel pump harness connector.

3. Remove fuel level sensor unit. Refer to 

FL-6, "Removal and Installation"

.

+

−

Continuity

Fuel level sensor unit and 

fuel pump

ECM

Connector

Terminal

Connector

Terminal

B48

4

E16

125

Existed

+

−

Continuity

Fuel level sensor unit and 

fuel pump

ECM

Connector

Terminal

Connector

Terminal

B48

5

E16

124

Existed