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Nissan Sentra B18 (2020-2025) Service Manual: 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 ″A″ circuit low)

Diagnosis condition

Ignition switch ON

Signal (terminal)

Fuel tank temperature sensor signal

Threshold

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

Diagnosis delay time

—

POSSIBLE CAUSE

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

  • Fuel temperature sensor

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

  1. 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 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 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. 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 3.

    NO >>

    GO TO 2.

  2. 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 ECM power supply circuit. Refer to Diagnosis Procedure.

    NO >>

    Repair or replace malfunctioning part.

  3. 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 4.

    NO >>

    Repair or replace malfunctioning part.

  4. 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.

    P0181 Ftt Sensor
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