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Home >> Nissan-Datsun >> 2009 >> Murano LE >> 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.
      TERMINALS VOLTAGE REFERENCE

      ECM Ground Voltage
      Connector Terminal
      F7 14 Ground Battery voltage

      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.

    TERMINALS VOLTAGE REFERENCE

    IPDM E/R Ground Voltage
    Connector Terminal
    F12 77 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: GO TO  16.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • IPDM E/R harness connector F12
    • 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.

  4. CHECK CONDENSER POWER SUPPLY CIRCUIT-I
    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Disconnect condenser harness connector.
    4. Turn ignition switch ON.
    5. Check the voltage between condenser harness connector and ground.
      TERMINALS VOLTAGE REFERENCE

      Condenser Ground Voltage
      Connector Terminal
      B81 1 Ground Battery voltage should exist for 1 seconds after ignition switch is turned ON.

      Is the inspection result normal? 

      YES: GO TO  8.

      NO: GO TO 5.

  5. CHECK 15A FUSE
    1. Turn ignition switch OFF.
    2. Disconnect 15A fuse (No. 41).
    3. Check 15A fuse.

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Replace fuse.

  6. CHECK CONDENSER POWER SUPPLY CIRCUIT-II
    1. Disconnect IPDM E/R harness connector.
    2. Check the continuity between IPDM E/R harness connector and condenser harness connector.
      TERMINAL CONTINUITY REFERENCE

      IPDM E/R Condenser Continuity
      Connector Terminal Connector Terminal
      E10 13 B81 1 Existed
    3. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  16.

      NO: GO TO 7.

  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E104, B4
    • IPDM E/R connector E10
    • Harness for open or short between IPDM E/R and condenser

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

  8. CHECK CONDENSER GROUND CIRCUIT
    1. Turn ignition switch OFF.
    2. Check the continuity between condenser harness connector and ground.
      TERMINAL CONTINUITY REFERENCE

      Condenser Ground Continuity
      Connector Terminal
      B81 2 Ground Existed
    3. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO  10.

      NO: GO TO 9.

  9. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B4, E104 (with rear view monitor)
    • Harness for open or short between condenser and ground

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

  10. CHECK CONDENSER

    Refer to "COMPONENT INSPECTION (CONDENSER) ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Replace condenser.

  11. 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.
      TERMINAL CONTINUITY REFERENCE

      IPDM E/R Fuel level sensor unit and fuel pump Continuity
      Connector Terminal Connector Terminal
      E10 13 B40 1 Existed

      Is the inspection result normal? 

      YES: GO TO  13.

      NO: GO TO 12.

  12. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B4, E104
    • 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.

  13. 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.
      TERMINAL CONTINUITY REFERENCE

      Fuel level sensor unit and fuel pump Ground Continuity
      Connector Terminal
      B40 3 Ground Existed

      Is the inspection result normal? 

      YES: GO TO  15.

      NO: GO TO 14.

  14. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors B4, E104 (with rear view monitor)
    • Harness for open or short between "fuel level sensor unit and fuel pump" and ground

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

  15. CHECK FUEL PUMP

    Refer to "COMPONENT INSPECTION (FUEL PUMP) ".

    Is the inspection result normal? 

    YES: GO TO 16.

    NO: Replace fuel pump.

  16. 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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