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Home >> Infiniti >> 2004 >> M45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P0181: FTT Sensor >> Diagnostic Procedure >> 2. Check Fuel Tank Temperature Sensor Power Supply Circuit
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2. Check Fuel Tank Temperature Sensor Power Supply Circuit

  1. Disconnect "fuel level sensor unit and fuel pump" harness connector.
    Fig 1: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector
    G00795930Courtesy of NISSAN MOTOR CO., U.S.A.
  2. Turn ignition switch ON.
  3. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-II or tester.
    Fig 2: Checking Voltage Between Terminal 4 & Ground
    G00795931Courtesy of NISSAN MOTOR CO., U.S.A.

    Voltage: Approximately 5V 

OK or NG 

  1. OK: GO TO 4. CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT .
  2. NG: GO TO 3.