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    Fault Code 275 Fuel Pumping Element Number 1 (Front) - Mechanical System Not Responding Properly or Out of Adjustment

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    Ahmedmah

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    Fault Code 275 Fuel Pumping Element Number 1 (Front) - Mechanical System Not Responding Properly or Out of Adjustment

    Uploaded by

    Ahmedmah
    2K views6 pages

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    275

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    Fault Code 275 Fuel Pumping Element Number 1 (Front) - Mechanical System Not Responding Properly or Out of Adjustment

    Uploaded by

    Ahmedmah

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    Fuel Pumping Element Number 1 (Front) - Mechanical System Not Responding Prope...

    Page 1 of 6

    FAULT CODE 275


    Fuel Pumping Element Number 1 (Front) - Mechanical
    System Not Responding Properly or Out of Adjustment
    View Related Topic

    Overview

    CODE REASON EFFECT


    Fault Code: 275 Fuel Pumping Element Number 1 (Front) - Engine will not run
    PID: S126 Mechanical System Not Responding Properly or possible low
    SPN: 1347 or Out of Adjustment. power.
    FMI: 7
    LAMP: Yellow
    SRT:

    High Pressure Pump

    Circuit Description

    The fuel pump contains two barrel and plunger assemblies; each barrel and plunger
    assembly utilizes an inlet and outlet check valve. Fuel at gear pump pressure is metered
    through the fuel pump actuator and unseats one of the two inlet check valves as the fuel at
    gear pump pressure enters the pumping chamber. As the pumping plunger begins its
    upward motion, the pressure in the pumping chamber increases rapidly and the inlet check
    valve is closed. As pressure reaches accumulator pressure, the outlet check valve is
    opened. As the plunger travels upward, fuel exits past the outlet check valve and
    pressurizes the fuel rail.

    Component Location

    The fuel pump is located on the backside of the gear housing. The barrel and plunger and
    check valve assemblies are part of the fuel pump head sub-assembly.

    Shop Talk

    Fault Code 275 will most likely come active while operating at a steady state loaded
    condition. At this condition commanded fuel pressures are highest and the pump's pressure

    14:06:41 2007-07-20
    Fuel Pumping Element Number 1 (Front) - Mechanical System Not Responding Prope... Page 2 of 6

    balance is affected the most.

    If a high pressure seal has failed, pump head drain flow will be excessive. If a seal failure
    has progressed far enough, the engine may not start because of an inability to develop fuel
    rail pressure.

    If the engine will not start, there are two indications that the pump head has failed:

    z The drain flow will be excessive. This can be measured while cranking the engine
    (refer to Troubleshooting and Repair Manual, ISC, QSC8.3, ISL, and QSL9 Series
    Engines, Bulletin 4021418).
    z The pumping plungers are broken or mechanically stuck. This can be checked by
    visual inspection (refer to Troubleshooting and Repair Manual, ISC, QSC8.3, ISL, and
    QSL9 Series Engines, Bulletin 4021418).

    A faulty fuel pressure sensor signal due to a damaged fuel pressure sensor signal wire will
    cause the fuel pressure sensor to be inconsistent. This condition can cause Fault Code 275
    to become active on an intermittent basis.

    Troubleshooting Steps

    STEPS SPECIFICATIONS
    STEP 1. Check the fault codes.
    STEP 1A. Check for an active Fault Code 275 has reoccurred at
    fault code. least 1 time during engine operation?
    STEP 2. Check for air in fuel.
    STEP 2A. Check for air in fuel. Air in fuel?
    STEP 3. Check the fuel pressure sensor
    connector.
    STEP 3A. Inspect the fuel Dirty or damaged pins?
    pressure sensor connector and
    wiring connections.
    STEP 4. Clear the fault codes.
    STEP 4A. Disable the fault code. Fault Code 275 inactive?
    STEP 4B. Clear the inactive fault All fault codes cleared?
    codes.

    Guided Step 1 - Check the fault codes.

    Guided Step 1A - Check for an active fault code.

    14:06:41 2007-07-20
    Fuel Pumping Element Number 1 (Front) - Mechanical System Not Responding Prope... Page 3 of 6

    Conditions

    z Turn keyswitch ON.


    z Connect INSITE™ the electronic
    service tool.
    z Clear all inactive fault codes.
    z Operate the engine at the steady
    state loaded condition.

    Action

    check for fault codes.

    z Use INSITE™ the electronic


    service tool to read the fault codes.

    Fault Code 275 has reoccurred at least 1 Fault Code 275 has reoccurred at least 1
    time during engine operation? time during engine operation?
    YES NO
    No Repair No Repair
    Go to 2A Go to 3A

    Guided Step 2 - Check for air in fuel.

    Guided Step 2A - Check for air in fuel.

    Conditions

    z Install a Compuchek® fitting at the


    outlet of the pressure side fuel
    filter.
    z Start the engine and allow it to idle.
    z Connect a test hose at the fuel
    filter head and run into a bucket.

    Action

    check for air in fuel as the engine idles.

    Perform the air in fuel test. Refer to


    Procedure 006-003 in Troubleshooting
    and Repair Manual, ISC, QSC8.3, ISL,

    14:06:41 2007-07-20
    Fuel Pumping Element Number 1 (Front) - Mechanical System Not Responding Prope... Page 4 of 6

    and QSL9 Series Engines, Bulletin


    4021418.

    Air in fuel? Air in fuel?


    YES NO
    The suction side fuel lines, suction filter, or No Repair
    tank pick-up is allowing air to enter fuel
    supply.

    Repair or replace the fuel lines, suction


    filter, or tank pick-up.

    Go to 1A Go to 3A

    Guided Step 3 - Check the fuel pressure sensor


    connector.

    Guided Step 3A - Inspect the fuel pressure sensor connector and wiring
    connections.

    Conditions

    z Turn keyswitch OFF.

    Action

    inspect the fuel pressure sensor


    connector for the following:

    z Loose connector
    z Corroded pins
    z Bent or broken pins
    z Pushed back or expanded pins
    z Moisture in or on the connector
    z Missing or damaged connector
    seals
    z Dirt or debris in or on the
    connector pins
    z Wire insulation damage
    z Connector shell broken
    z Damaged locking tab connector.

    For general inspection techniques, refer

    14:06:41 2007-07-20
    Fuel Pumping Element Number 1 (Front) - Mechanical System Not Responding Prope... Page 5 of 6

    to Component Connector and Pin


    Inspection, Procedure 019-361.

    Refer to the wiring diagram for connector


    pin identification.

    NOTE: A bad connection on the fuel


    pressure sensor or intermittent wiring
    connections can cause the signal
    reading to fluctuate and cause this fault
    code to become active on an intermittent
    basis.

    Dirty or damaged pins? Dirty or damaged pins?


    YES NO
    Clean the connector and pins. Replace the fuel pump head. Refer to
    Procedure 005-227 in Troubleshooting and
    Repair the damaged harness, connector, Repair Manual, ISC, QSC8.3, ISL and
    or pins if possible. QSL9 Engines, Bulletin 4021418.

    Go to 4A Go to 4A

    Guided Step 4 - Clear the fault codes.

    Guided Step 4A - Disable the fault code.

    Conditions

    z Connect all components.


    z Connect INSITE™ the electronic
    service tool.

    Action

    disable the fault code.

    z Start the engine and let it idle for 1


    minute.
    z Operate the engine at a steady-
    state loaded condition.
    z Use INSITE™ the electronic
    service tool to verify the fault code
    is inactive.

    14:06:41 2007-07-20
    Fuel Pumping Element Number 1 (Front) - Mechanical System Not Responding Prope... Page 6 of 6

    Fault Code 275 inactive? Fault Code 275 inactive?


    YES NO
    No Repair Return to the troubleshooting steps or
    contact a local Cummins Authorized Repair
    Location if all steps have been completed
    and rechecked.

    Go to 4B Go to 1A

    Guided Step 4B - Clear the inactive fault code.

    Conditions

    z Connect all components.


    z Turn keyswitch ON.
    z Connect INSITE™ the electronic
    service tool.

    Action

    clear the inactive fault codes.

    z Use INSITE™ the electronic


    service tool to erase the inactive
    fault codes.

    All fault codes cleared? All fault codes cleared?


    YES NO
    No Repair Troubleshoot any remaining active fault
    codes.

    Repair complete Appropriate troubleshooting steps

    Last Modified: 18-Mar-2004

    Copyright© 2004
    Cummins, Inc.
    All rights reserved

    14:06:41 2007-07-20

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