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Home › Nissan-Datsun › 2008 › Sentra SE-R › Repair and Diagnosis › External Pages › Different car › Section 193 (Engine Control System - DTCS P0171 To P0453) › DTC P0181 FTT Sensor › Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK COMBINATION METER FUNCTION 

    Refer to "COMBINATION METERS ".

    OK or NG 

    OK: GO TO 2.

    NG: Go to "FUEL LEVEL SENSOR UNIT INSPECTION ".

  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.
      Fig 1: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector
      G04894781Courtesy of NISSAN NORTH AMERICA, INC.
    3. Turn ignition switch ON.
    4. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-II or tester.

      Voltage: Approximately 5V 

      Fig 2: Checking Voltage Between Fuel Level Sensor Unit And Fuel Pump Terminal 4 And Ground
      G04875130Courtesy of NISSAN NORTH AMERICA, INC.

    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 2 and combination meter terminal 9. Refer to Wiring Diagram .

      Continuity should exist. 

    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 connectors E152, M31
    • 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 ".

    OK or NG 

    OK: GO TO 7.

    NG: Replace fuel level sensor unit.

  7. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    INSPECTION END 

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