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Home >> Nissan-Datsun >> 2004 >> Altima SE, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control System - 3.5L >> DTC P0460: Fuel Level Sensor >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK FUEL LEVEL 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: Disconnecting Fuel Level Sensor Unit And Fuel Pump Harness Connector
      G02885653Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between "fuel level sensor unit and fuel pump" terminal 2 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG

    1. OK : GO TO  3.
    2. NG : GO TO 2.
  2. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M12, B2
    • Harness for open or short between combination meter and "fuel level sensor unit and fuel pump"
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
      Fig 2: Checking Voltage Between Terminal 2 And Ground
      G02885654Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK FUEL LEVEL 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 5 and ground.

      Refer to Wiring Diagram .

      Continuity should exist. 

    3. Also check harness for short to power.

    OK or NG

    1. OK : GO TO  5.
    2. NG : GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M12, B2
    • Harness for open or short between "fuel level sensor unit and fuel pump" and ground
    1. : Repair open circuit or short to power in harness or connectors.
  5. CHECK FUEL LEVEL SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 69 and "fuel level sensor unit and fuel pump" terminal 2, ECM terminal 78 and "fuel level sensor unit and fuel pump" terminal 5.

      Refer to Wiring Diagram .

      Continuity should exist. 

    3. Also check harness for short to ground or short to power.

    OK or NG

    1. OK : GO TO  7.
    2. NG : GO TO 6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M71, F59
    • Harness for open or short between ECM and "fuel level sensor unit and fuel pump"
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK FUEL LEVEL SENSOR 

    Refer to "FUEL LEVEL SENSOR UNIT CHECK ".

    OK or NG

    1. OK : GO TO 8.
    2. NG : Replace fuel level sensor unit.
  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. : INSPECTION END 
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