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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2407 (Engine Control System - Component Testing (VK56DE)) >> Fuel Pump >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  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: Pinching Fuel Feed Hose
    G08165252Courtesy of NISSAN NORTH AMERICA, INC.
  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 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 Using Tester
    G08165253Courtesy of NISSAN NORTH AMERICA, INC.
  3. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

    Check voltage between IPDM E/R terminal 46 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO 4.

    NG: GO TO  9.

    Fig 3: Checking Voltage Between IPDM E/R Terminal 46 And Ground Using Tester
    G08165254Courtesy of NISSAN NORTH AMERICA, INC.
  4. DETECT MALFUNCTIONING PART

    Check harness for open or short between IPDM E/R and ECM.

    Repair harness or connectors.

  5. CHECK FUSE
    1. Turn ignition switch OFF.
    2. Disconnect 15 A fuse (No. 48).
    3. Check 15 A fuse.

    OK or NG 

    OK: GO TO 6.

    NG: Replace fuse.

  6. CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect "fuel level sensor unit and fuel pump" harness connector.
    3. Disconnect IPDM E/R harness connector E119.
    4. Check harness continuity between IPDM E/R terminal 13 and "fuel level sensor unit and fuel pump" terminal 1, "fuel level sensor unit and fuel pump" terminal 3 and ground.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

    5. Also check harness for short to ground and short to power.
    Fig 4: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector
    G08165255Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO  8.

    NG: GO TO 7.

  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E41, C1
    • Harness for open or short between fuel pump and IPDM E/R
    • Harness for open or short between fuel pump and ground

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

  8. CHECK FUEL PUMP

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 9.

    NG: Replace "fuel level sensor unit and fuel pump". Refer to FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY .

  9. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    OK or NG 

    OK: Replace IPDM E/R. Refer to UNIT REMOVAL AND INSTALLATION .

    NG: Repair or replace harness or connectors.

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