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Home >> Nissan-Datsun >> 2009 >> Maxima S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> Fuel Pump >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between ECM harness connector and ground.
      VOLTAGE SPECIFICATION

      ECM Voltage
      + -
      Connector Terminal Connector Terminal
      F14 14 E10 112 Battery voltage
      Fig 1: Checking Voltage Between ECM Harness Connector And Ground
      G05869982Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: GO TO 2.

  2. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

    Check the voltage between IPDM E/R harness connector and ground.

    VOLTAGE SPECIFICATION

    IPDM E/R Ground Voltage
    Connector Terminal
    F10 77 Ground Battery voltage
    Fig 2: Checking Voltage Between IPDM E/R Harness Connector And Ground
    G05869983Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: GO TO 8.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • IPDM E/R harness connector F10
    • Harness for open or short between IPDM E/R and ECM

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

  4. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
    1. Disconnect "fuel level sensor unit and fuel pump" harness connector.
    2. Check harness continuity between IPDM E/R harness connector and "fuel level sensor unit and fuel pump" harness connector.
      CONTINUITY CHART

      IPDM E/R Fuel level sensor unit and fuel pump Continuity
      Connector Terminal Connector Terminal
      E18 13 B42 1 Existed

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B10, E29
    • Harness for open or short between "fuel level sensor unit and fuel pump" and IPDM E/R

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

  6. CHECK FUEL PUMP GROUND CIRCUIT
    1. Disconnect "fuel level sensor unit and fuel pump" harness connector.
    2. Check the continuity between "fuel level sensor unit and fuel pump" harness connector and ground.
      CONTINUITY CHART

      Fuel level sensor unit and fuel pump Ground Continuity
      Connector Terminal
      B42 3 Ground Existed

      Is the inspection result normal? 

      YES: GO TO 7.

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

  7. CHECK FUEL PUMP

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: Replace fuel pump.

  8. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R.

    NO: Repair or replace harness or connectors.

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