S Nissan Sentra Manuals Library
Factory-style information for owners and repair work

Nissan Sentra techinfo

Find Nissan Sentra owner information, maintenance instructions, technical references, service procedures and useful repair pages in one clean online library.

Quick access Sentra Docs
B18 Owner's 2020-2025 Sentra owner information B18 Service 2020-2025 Sentra Workshop manual B17 Owner's 2013-2019 Sentra owner documentation B17 Service 2013-2019 Sentra service information

Nissan Sentra B18 (2020-2025) Service Manual: P0181 Ftt Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0181

FTT SENSOR

(Fuel temperature sensor ″A″ circuit range/performance)

A

Diagnosis condition

—

Signal (terminal)

Fuel tank temperature sensor signal

Threshold

Rationally incorrect voltage from the sensor is sent to ECM, compared with the voltage signals from ECT sensor and intake air temperature sensor.

Diagnosis delay time

—

B

Diagnosis condition

Engine cold start

Signal (terminal)

Fuel tank temperature sensor signal

Threshold

The comparison result of signals transmitted to ECM from each temperature sensor (IAT sensor, ECT sensor, EOT sensor, and FTT sensor) shows that the voltage signal of the FTT sensor is higher/lower than that of other temperature sensors when the engine is started with its cold state.

Diagnosis delay time

—

POSSIBLE CAUSE

Malfunction A

  • Harness or connectors (FTT sensor circuit is open or shorted)

  • Fuel temperature sensor

Malfunction B

  • Harness or connectors (High or low resistance in the FTT sensor circuit)

Fuel temperature sensor

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

  1. INSPECTION START

    Is it necessary to erase permanent DTC?

    YES >>

    GO TO 7.

    NO >>

    GO TO 2.

  2. PRECONDITIONING

    If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

    >>

    GO TO 3.

  3. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A-1

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

    2. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES >>

    Proceed to DTC Diagnosis Procedure.

    NO >>

    GO TO 4.

  4. CHECK ENGINE COOLANT TEMPERATURE

    With CONSULT

    1. Select “COOLANT TEMP/S” in “DATA MONITOR” mode of “ENGINE” using CONSULT.

    2. Check “COOLANT TEMP/S” value.

    With GST

    Follow the procedure “With CONSULT” above.

    “COOLANT TEMP/S” less than 60°C (140°F)?

    YES-1 >>

    To check malfunction symptom before repair: Refer to Intermittent Incident.

    YES-2 >>

    Confirmation after repair: INSPECTION END

    NO >>

    GO TO 5.

  5. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A-2

    With CONSULT

    1. Cool engine down until “COOLANT TEMP/S” is less than 60°C (140°F).

    2. Wait at least 10 seconds.

    3. Check 1st trip DTC.

    With GST

    Follow the procedure “With CONSULT” above.

    Is 1st trip DTC detected?

    YES >>

    Proceed to DTC Diagnosis Procedure.

    NO >>

    GO TO 6.

  6. PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B

    Note:

    Use the component function check to check the overall function of the FTT sensor circuit. During this check, a 1st trip DTC might not be confirmed.

    1. Turn ignition switch OFF.

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

    3. Remove “fuel level sensor unit, fuel filter and fuel pump assembly”. Refer to 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.

      Fuel level sensor unit and fuel pump

      Condition

      Resistance

      Terminal

      5

      6

      Temperature [°C (°F)]

      20 (68)

      2.3 – 2.7 kΩ

      50 (122)

      0.79 – 0.90 kΩ

    Is the inspection result normal?

    YES-1 >>

    To check malfunction symptom before repair: Refer to Intermittent Incident.

    YES-2 >>

    Confirmation after repair: INSPECTION END

    NO >>

    Proceed to DTC Diagnosis Procedure.

  7. PRECONDITIONING

    If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

    TESTING CONDITION:

    • Before performing the following procedure, do not add fuel.

    • Before performing the following procedure, check that fuel level is between 1/4 and 4/4.

    • Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

    >>

    GO TO 8.

  8. PERFORM DTC CONFIRMATION PROCEDURE

    1. Move the Nissan Sentra vehicle to a cool place.

      Note:

      Cool the vehicle in an environment of ambient air temperature between −10°C (14°F) and 35°C (95°F).

    2. Turn ignition switch OFF and leave the Nissan Sentra vehicle for 12 hours.

      CAUTION:

      Never turn ignition switch ON during this procedure.

      Note:

      The Nissan Sentra vehicle must be cooled with the hood open.

    3. Start engine and let it idle for 5 minutes or more.

      CAUTION:

      Never turn ignition switch OFF during idling.

    4. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES >>

    Refer to DTC Diagnosis Procedure.

    NO-1 >>

    To check malfunction symptom before repair: Refer to Intermittent Incident.

    NO-2 >>

    Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. INSPECTION START

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

    Which malfunction is detected?

    A>>

    GO TO 2.

    B>>

    GO TO 5.

  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.

      +

      −

      Voltage

      (Approx.)

      Fuel level sensor unit and fuel pump

      Connector

      Terminal

      B48

      5

      Ground

      5 V

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    GO TO 3.

  3. CHECK 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.

      Fuel level sensor unit and fuel pump

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B48

      5

      E16

      138

      Existed

    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 malfunctioning part.

  4. 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.

      Fuel level sensor unit and fuel pump

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B48

      6

      E16

      158

      Existed

    4. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    Repair or replace malfunctioning part.

  5. CHECK FTT SENSOR

    Refer to DTC Description.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace fuel level sensor unit, fuel filter and fuel pump assembly (with fuel tank temperature sensor). Refer to Removal and Installation.

    P0171 Fuel Injection System Function
    Dtc Description DTC Description With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on ...
    P0182 Ftt Sensor
    Dtc Description DTC Description DTC DETECTION LOGIC DTC CONSULT screen terms (Trouble diagnosis content) DTC detection condition P0182 FTT SEN/CIRCUIT (Fuel temperature sensor ...

    Other materials:

    C106e-54 Steering Angle Sensor
    Dtc Description DTC Description DTC DETECTION LOGIC DTC No. CONSULT screen item (Trouble diagnosis content) DTC detection condition ...

    B1019 Occupant Sens
    Dtc Description DTC Description DESCRIPTION B1019 OCCUPANT SENS The OCS control unit is wired to the air bag diagnosis sensor unit. The air bag diagnosis sensor unit will monitor the OCS for failures and interruptions in communication between the OCS control unit and the air bag ...

    B1305 Control Unit Internal Fault
    Dtc Description DTC Description DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detection condition ...