2008 Infiniti FX35 AWDFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. CHECK OVERALL FUNCTION 
    1. Turn ignition switch ON.
    2. Pinch fuel feed hose with two fingers.

      Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned ON. 

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  2.

    Fig 1: Identifying Fuel Feed Hose And Fuel Damper
    G05216936Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Turn ignition switch ON.
    4. Check voltage between ECM terminal 113 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  5.

    NG: GO TO  3.

    Fig 2: Checking Voltage Between ECM Terminal 113 And Ground
    G04900786Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector E8.
    3. Check harness continuity between IPDM E/R terminal 40 and ECM terminal 113.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

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

    OK or NG 

    OK: GO TO  11.

    NG: GO TO  4.

  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E211, M41
    • Harness for open or short between IPDM E/R and ECM

      >> Repair open circuit or short to ground or short to power in harness or connectors.

  5. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III 
    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Disconnect "fuel level sensor unit and fuel pump" harness connector.
    4. Turn ignition switch ON.
      Fig 3: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector
      G05216535Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Check voltage between "fuel level sensor unit and fuel pump" terminal 1 and ground with CONSULT-III or tester.

      Voltage: Battery voltage should exist for 1 second after ignition switch is turned ON. 

    OK or NG 

    OK: GO TO  9.

    NG: GO TO  6.

    Fig 4: Checking Voltage Between Fuel Level Sensor Unit And Fuel Pump Terminal 1 And Ground
    G04895195Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK 15A FUSE 
    1. Turn ignition switch OFF.
    2. Disconnect 15A fuse.
    3. Check 15A fuse.

    OK or NG 

    OK: GO TO  7.

    NG: Replace fuse.

  7. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-IV 
    1. Disconnect IPDM E/R harness connector E8.
    2. Check harness continuity between IPDM E/R terminal 39 and "fuel level sensor unit and fuel pump" terminal 1.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    3. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  11.

    NG: GO TO  8.

  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E206, B6
    • Harness for open or short between IPDM E/R and "fuel level sensor unit and fuel pump"

      >> Repair open circuit or short to ground or short to power in harness or connectors.

  9. CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 3 and ground.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    2. Also check harness for short to power.

    OK or NG 

    OK: GO TO  10.

    NG: Repair open circuit or short to power in harness or connectors.

  10. CHECK FUEL PUMP 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  11.

    NG: Replace "fuel level sensor unit and fuel pump".

  11. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG 

    OK: Replace IPDM E/R. Refer to IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

    NG: Repair or replace harness or connectors.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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