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Home >> Nissan-Datsun >> 2003 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1105 (Engine Control System) >> DTC P0181: FTT Sensor >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC WITH UNIFIED METER AND A/C AMP. 

    Refer to  SELF-DIAGNOSTIC RESULTS"  ". 

    OK or NG 

    1. OK: GO TO 2.
    2. NG: Go to "FUEL LEVEL SENSOR SIGNAL INSPECTION 1 ".
  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.
      Fig 1: Disconnecting Fuel Level Sensor Unit And Fuel Pump Harness Connector
      G00782397Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between fuel level sensor unit and fuel pump terminal 4 and ground with CONSULT-II or tester.

    Voltage: Approximately 5V 

    OK or NG 

    1. OK: GO TO  4.
    2. NG: GO TO 3.
      Fig 2: Checking Voltage Between Fuel Level Sensor Unit And Fuel Pump Terminal (P0181)
      G00782398Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M9, B2
    • Harness for open or short between ECM and fuel level sensor unit and fuel pump
      1. Repair harness or connector.
  4. CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect unified meter and A/C amp. harness connector.
    3. Check harness continuity between fuel level sensor unit and fuel pump terminal 5 and unified meter and A/C amp. terminal 36. Refer to WIRING DIAGRAM .

      Continuity should exist. 

    4. Also check harness for short to power.

    OK or NG 

    1. OK: GO TO  6.
    2. NG: GO TO 5.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors B2, M9
    • Harness for open or short between "fuel level sensor unit and fuel pump" and "unified meter and A/C amp."
      1. Repair open circuit or short to power in harness or connector.
  6. CHECK FUEL TANK TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Replace fuel level sensor unit.
  7. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. INSPECTION END. 
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