2010 Infiniti M35 BaseFACTORY OEM SERVICE PROCEDURE

Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connections M16, M70. Refer to "GROUND INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connections.

  2. CHECK FPCM POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect fuel pump control module (FPCM) harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between FPCM harness connector and ground.
      CONNECTOR TERMINAL VOLTAGE CHART

      FPCM Ground Voltage
      Connector Terminal
      B111 2 Ground Battery voltage
      Fig 1: Checking Voltage Between FPCM Terminal 2 And Ground
      G05210004Courtesy of NISSAN MOTOR CO., U.S.A.

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B4, E106
    • IPDM E/R harness connector E8
    • 15 A fuse (No. 81)
    • Harness for open or short between FPCM and IPDM E/R

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

  4. CHECK FPCM GROUND CIRCUIT FOR OPEN AND SHORT-I
    1. Turn ignition switch OFF.
    2. Check the continuity between FPCM harness connector and ground.
      CONNECTOR TERMINAL CONTINUITY CHART

      FPCM Ground Continuity
      Connector Terminal
      B111 3 Ground Existed
    3. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair open circuit or short to power in harness or connectors.

  5. CHECK FPCM GROUND CIRCUIT FOR OPEN AND SHORT-II
    1. Disconnect "fuel level sensor unit and fuel pump" (main) harness connector.
    2. Disconnect dropping resistor harness connector.
    3. Check the continuity between "fuel level sensor unit and fuel pump" (main) harness connector or FPCM harness connector and dropping resistor harness connector.
      CONNECTOR TERMINAL CONTINUITY CHART

      Fuel level sensor unit and fuel pump (main) Dropping resistor Continuity
      Connector Terminal Connector Terminal
      B433 3 B112 2 Existed
      B111 4 B112 2 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 B65, B434
    • Harness for open or short between "fuel level sensor unit and fuel pump" (main) and dropping resistor
    • Harness for open or short between FPCM and dropping resistor

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

  7. CHECK FPCM INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Disconnect ECM harness connector.
    2. Check the continuity between FPCM harness connector and ECM harness connector.
      CONNECTOR TERMINAL CONTINUITY CHART

      FPCM ECM Continuity
      Connector Terminal Connector Terminal
      B111 4 F105 32 Existed
    3. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  9.

      NO: GO TO 8.

  8. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B2, M13
    • Harness connectors F102, M72
    • Harness for open or short between FPCM and ECM

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

  9. CHECK FPCM OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check the continuity between ECM and FPCM
      CONNECTOR TERMINAL CONTINUITY CHART

      ECM FPCM Continuity
      Connector Terminal Connector Terminal
      F105 14 B111 1 Existed
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  11.

      NO: GO TO 10.

  10. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B2, M13
    • Harness connectors F102, M72
    • Harness for open or short between ECM and FPCM

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

  11. CHECK FPCM

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Replace FPCM.

  12. CHECK INTERMITTENT INCIDENT

    Refer to "DESCRIPTION ".

    INSPECTION END

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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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