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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1183 (Engine Control System - DTCS U0101 To P0183 (VQ40DE)) >> DTC P0181: FTT Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECTION START

    Confirm the detected malfunction (A or B). Refer to "ON BOARD DIAGNOSIS LOGIC ".

    Which malfunction is detected? 

    A >> GO TO 2.

    B >> GO TO  7.

  2. CHECK COMBINATION METER FUNCTION

    Refer to "WORK FLOW ".

    OK or NG 

    OK: GO TO 3.

    NG: Go to "COMPONENT FUNCTION CHECK ".

  3. 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.
      Fig 1: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector
      G08170529Courtesy of NISSAN NORTH AMERICA, INC.
    4. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT or tester.

    Voltage: Approximately 5V 

    Fig 2: Checking Voltage Between Fuel Level Sensor Unit And Fuel Pump Terminal 4 And Ground Using Tester
    G08170530Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 4.

  4. 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.

  5. CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 3 and ground. Refer to WIRING DIAGRAM .

      Continuity should exist  .

    3. Also check harness for short to power.

    OK or NG 

    OK: GO TO  7.

    NG: GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E41, C1
    • Harness for open or short between "fuel level sensor unit and fuel pump" ground

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

  7. CHECK FUEL TANK TEMPERATURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 8.

    NG: Replace fuel level sensor unit. Refer to "REMOVAL AND INSTALLATION ".

  8. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END 

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