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Home >> Nissan-Datsun >> 2005 >> Quest Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 341 (Engine Control System) >> DTC P0181: FTT Sensor >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten four ground screws on the body. Refer to GROUND INSPECTION .
      Fig 1: Checking Ground Connections
      G02410050Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO  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

  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: Disconnecting Fuel Level Sensor Unit & Fuel Pump Harness Connector
      G02410051Courtesy 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 5 V 

    OK or NG

    • OK: GO TO  5.
    • NG: GO TO  4.
      Fig 3: Checking Voltage Between Fuel Level Sensor Unit & Fuel Pump Terminal 4 & Ground
      G02410052Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M81, B20
    • Harness for open or short between ECM and "fuel level sensor unit and fuel pump"
    • Repair 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 - FTTS .

      Continuity should exist. 

    4. Also check harness for short to ground or short to power.

    OK or NG

    • OK: GO TO  7.
    • 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."
    • 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

    • OK: GO TO  8.
    • NG: Replace fuel level sensor unit.
  8. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    • INSPECTION END 
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