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Home >> Infiniti >> 2008 >> EX35 Base, RWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P0137 To P0448 >> P0181 FTT Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Repair or replace ground connection.

  2. CHECK DTC WITH "UNIFIED METER AND A/C AMP."

    Refer to "CONSULT-III FUNCTION (METER/M&A) ".

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: 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.
    4. Check the voltage between "fuel level sensor unit and fuel pump (main)" harness connector and ground.
      VOLTAGE SPECIFICATIONS

      Fuel level sensor unit and fuel pump Ground Voltage (V)
      Connector Terminal
      B22 4 Ground Approx. 5

    Is the inspection result normal? 

    YES: GO TO  5.

    NO: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M7, B1
    • Harness for open or short between ECM and "fuel level sensor unit and fuel pump (main)"

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

  5. 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 the continuity between "fuel level sensor unit and fuel pump (main)" harness connector and "unified meter and A/C amp." harness connector.
      CONTINUITY SPECIFICATIONS

      Fuel level sensor unit and fuel pump (main) Unified meter and A/C amp. Continuity
      Connector Terminal Connector Terminal
      B22 5 M67 58 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  7.

    NO: GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M7, B1
    • Harness for open or short between "fuel level sensor unit and fuel pump (main)" and "unified meter and A/C amp."

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

  7. CHECK FUEL TANK TEMPERATURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: Replace "fuel level sensor unit and fuel pump (main)".

  8. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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