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Fuel Level Sensor Signal Inspection

Symptom:

NOTE: The following symptoms do not indicate a malfunction.
  • Depending on vehicle position or driving circumstance, the fuel level in the tank shifts and the indication may fluctuate.
  • If the vehicle is fueled with the ignition switch ON, the indication will update slowly.
  • If the vehicle is tilted when the ignition switch is turned ON, fuel in the tank may flow to one direction resulting in a change of reading.
  1. CHECK COMBINATION METER INPUT SIGNAL 
    1. Select "METER" on CONSULT-III.
    2. Using "FUEL METER" on "DATA MONITOR", compare the value of "DATA MONITOR" with fuel gauge pointer of combination meter.
      REFERENCE VALUE OF DATA MONITOR

      Fuel gauge pointer Reference value of data monitor [lit.]
      Full Approx. 49
      3/4 Approx. 34
      1/2 Approx. 22
      1/4 Approx. 10
      Empty Approx. 4

    OK or NG 

    OK >> GO TO 2.

    NG >> Replace combination meter. Refer to "COMBINATION METER ".

  2. CHECK HARNESS CONNECTOR 
    1. Turn ignition switch OFF.
    2. Check combination meter and fuel level sensor unit terminals (meter-side and harness-side) for poor connection.

    OK or NG 

    OK >> GO TO 3.

    NG >> Repair or replace terminals or connectors.

  3. CHECK FUEL LEVEL SENSOR UNIT CIRCUIT 
    1. Disconnect combination meter connector and fuel level sensor unit connector.
    2. Check continuity between combination meter harness connector (A) and fuel level sensor unit and fuel pump harness connector (B).
      TERMINALS CONTINUITY REFERENCE

      A B Continuity
      Connector Terminal Connector Terminal
      M24 6 B100 2 Yes
    3. Check continuity between combination meter harness connector (A) and ground.
      TERMINALS CONTINUITY REFERENCE

      A Ground Continuity
      Connector Terminal
      M24 6 No
      Fig 1: Checking Continuity Between Combination Meter Connector And Fuel Level Sensor Unit Connector
      G04815499Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> GO TO 4.

    NG >> Repair harness or connector.

  4. CHECK FUEL LEVEL SENSOR UNIT GROUND CIRCUIT 
    1. Check continuity between combination meter harness connector (A) and fuel level sensor unit and fuel pump harness connector (B).
      TERMINALS CONTINUITY REFERENCE

      A B Continuity
      Connector Terminal Connector Terminal
      M24 24 B100 5 Yes
    2. Check continuity between combination meter harness connector (A) and ground.
      TERMINALS CONTINUITY REFERENCE

      A Ground Continuity
      Connector Terminal
      M24 24 No
      Fig 2: Checking Continuity Between Combination Meter Connector And Fuel Level Sensor Unit Connector
      G04815500Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> GO TO 5.

    NG >> Repair harness or connector.

  5. CHECK FUEL LEVEL SENSOR UNIT 

    Check fuel level sensor unit. Refer to "FUEL LEVEL SENSOR UNIT CHECK ".

    OK or NG 

    OK >> Check fuel level sensor unit installation, and check whether the float arm interferes or binds with any of the internal components in the fuel tank. Repair or replace malfunctioning part, if necessary.

    NG >> Replace fuel level sensor unit.

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