FixVault
Home › Infiniti › 2005 › FX45 › Repair and Diagnosis › Engine Performance › Engine Control System - VK45DE › DTC P0181: FTT Sensor › Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION  ".
      Fig 1: Loosening And Retightening Ground Screws
      G02361673Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 2.
    2. NG: Repair or replace ground connections.
  2. CHECK DTC WITH "UNIFIED METER AND A/C AMP". 

    Refer to "SELF-DIAGNOSTIC RESULTS ".

    OK or NG

    1. OK: GO TO 3.
    2. NG: Go to "FUEL LEVEL SENSOR SIGNAL INSPECTION ".
  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.
      Fig 2: Disassembling Harness Connector
      G02361674Courtesy 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.
      1. Voltage: Approximately 5V 

    OK or NG

    1. OK: GO TO  5 .
    2. NG: GO TO 4.
    Fig 3: Checking Voltage Between "Fuel Level Sensor Unit And Fuel Pump" Terminal 4 And Ground
    G02361675Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors B1, M11
    • 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 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 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  .
      1. Continuity should exist. 
    4. Also check harness for short to ground and 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 B1, M11
    • 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 ground or short to power in harness or connector.
  7. CHECK FUEL TANK TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION  ".

    OK or NG

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

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  ".

    1. : INSPECTION END 
About FixVault