LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2009 >> Cube Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0181 To P0607 >> DTC P0181: FTT Sensor >> Diagnosis Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection E38. Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Repair or replace ground connection.

  2. CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
    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 SPECIFICATION

    Fuel level sensor unit and fuel pump Ground Voltage
    Connector Terminal
    B40 4 Ground Approx. 5 V

    Is the inspection result normal? 

    YES: GO TO  4.

    NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B4, M79
    • Harness connectors M77, E105
    • Harness connectors E8, F1
    • Harness for open or short between ECM and "fuel level sensor unit and fuel pump"

    Repair open circuit or short to ground or short to power in 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 the continuity between "fuel level sensor unit and fuel pump" harness connector and ECM harness connector.
      CONTINUITY SPECIFICATION

      Fuel level sensor unit and fuel pump Combination meter Continuity
      Connector Terminal Connector Terminal
      B40 5 M34 24 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M79, B4
    • Harness for open or short between "fuel level sensor unit and fuel pump" and combination meter

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

  6. CHECK FUEL TANK TEMPERATURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Replace "fuel level sensor unit and fuel pump".

  7. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

scientia non olet · About LEMON Manuals