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SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P0087

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DTC Code DTC Name
P0087 Fuel Rail / System Pressure - Too Low
*1 No. 1 Injector Driver (EDU) *2 No. 2 Injector Driver (EDU) *3 ECM *4 Fuel Injector Assembly (for Direct Injection) *5 Fuel Pressure Sensor *6 Spill Control Valve *7 Pulsation Damper *8 Check Valve *9 Fuel Pump (for High Pressure Bank 1 Side) *10 Fuel Pump (for High Pressure Bank 2 Side) *11 Intake Camshaft (for Bank 1) *12 Intake Camshaft (for Bank 2) *13 Pressure Regulator *14 Fuel Filter *15 Fuel Pump (for Low Pressure Side) *16 Jet Pump *17 Fuel Tank *18 Fuel Relief Valve *a to Fuel Injector Assembly for Port Injection Line *b High Pressure Fuel Line *c Low Pressure Fuel Line *d Return Fuel Line
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DESCRIPTION

The high-pressure fuel system consists of the spill control valve, pump plunger, check valve, relief valve and fuel pressure sensor. The spill control valve opens and closes the low-pressure fuel line (from the fuel tank), the pump plunger (operated by the camshaft) pressurizes fuel, the check valve mechanically opens and closes the high pressure fuel line (to the fuel delivery pipe), the relief valve prevents fuel pressure from becoming extremely high, and the fuel pressure sensor located on the fuel delivery pipe monitors fuel pressure.

The fuel pump (for high pressure side) is installed to the cylinder head cover (bank 1 and bank 2) and is driven by the cam located at the rear end of the intake camshaft.

The plunger moves up and down by the camshaft rotations, and produces a vacuum to suck fuel and pressurizes the fuel. This fuel then pushes the check valve open and flows into the fuel delivery pipe. The ECM opens and closes the spill control valve to regulate the fuel pressure to the target fuel pressure of 2.5 to 18 MPa (25.5 to 183.5 kgf/cm2, 363 to 2611 psi). In order to obtain and maintain the target pressure, the ECM monitors the fuel pressure using the fuel pressure sensor and performs the feedback control. If the internal fuel pressure of the fuel delivery pipe exceeds the standard pressure of 23.6 MPa (240.6 kgf/cm2, 3423 psi), the fuel relief valve built into the fuel pump (for high pressure side) discharges the fuel pressure.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0087 Fuel Rail / System Pressure - Too Low

Although the ECM is not requesting the fuel pump (for high pressure side) open the spill valve, fuel pressure decreases 5 MPa (51.0 kgf/cm2, 725 psi) from target fuel pressure for about 10 seconds (1 trip detection logic).

  • Leak of fuel

  • Fuel pipe (Fuel tank - Fuel pump [for high pressure side])

  • Fuel pipe (Fuel pump [for high pressure side] - Fuel injector assembly [for direct injection])

  • Fuel injector assembly (for direct injection)

  • Fuel pump (for high pressure side)

  • Injector driver (EDU)

  • Fuel pump (for low pressure side)

  • Fuel pressure sensor

  • ECM

 Comes on DTC stored
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MONITOR DESCRIPTION

If the fuel pressure decreases despite an increase request signal being sent to the fuel pump (for high pressure) by the ECM, the ECM will illuminate the MIL and store this DTC.

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MONITOR STRATEGY

Required Sensors/Components Fuel pressure sensor
Frequency of Operation Continuous
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CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

  3. Record the Freeze Frame Data.

  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  5. Turn the engine switch off and wait for at least 30 seconds.

  6. Turn the engine switch on (IG) and turn the GTS on.

  7. Start the engine.

  8. Based on engine speed, engine load and other freeze frame data stored in the ECM, reproduce the conditions present when the DTC was stored.

  9. Enter the following menus: Powertrain / Engine / Trouble Codes.

  10. Read the pending DTCs.

    Tip:

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  12. Input the DTC: P0087.

  13. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    Tip:

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

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CAUTION / NOTICE / HINT

Tip:

  • Bank 1 refers to the bank that includes the No. 1 cylinder*.

    *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.

  • Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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PROCEDURE


  1. Click here

    CHECK FUEL LEAK


    1. Check around and beneath the vehicle for fuel leaks, fumes, etc.

      OK
      No fuel leaks present.
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE FUEL LEAK POINT

  2. Click here

    CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0087)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine / Trouble Codes.

    4. Read the DTCs.


      1. Powertrain > Engine > Trouble Codes


      Result
      Result Proceed to
      DTC P0087 is output A
      DTC P0087 and other DTCs are output B
      Tip:

      If any DTCs other than P0087 are output, troubleshoot those DTCs first.


  3. Click here

    CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST


    1. Has the vehicle run out of fuel in the past?

      Result
      Proceed to
      YES
      NO

    • YES

      DTC CAUSED BY RUNNING OUT OF FUEL

    • NOClick here
  4. Click here

    CHECK MISFIRE COUNT OF DIRECT INJECTION


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Start the engine and warm it up.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct / Injection Way and Cylinder #1 Misfire Count to Cylinder #8 Misfire Count.


      1. Powertrain > Engine > Active Test
        Active Test Display
        Control the Injection Way
        Data List Display
        Injection Way
        Cylinder #1 Misfire Count
        Cylinder #2 Misfire Count
        Cylinder #3 Misfire Count
        Cylinder #4 Misfire Count
        Cylinder #5 Misfire Count
        Cylinder #6 Misfire Count
        Cylinder #7 Misfire Count
        Cylinder #8 Misfire Count













    5. Allow the engine to idle.

    6. Monitor all of the Misfire Count values that are displayed on the GTS.

      Result
      Injection Way Result Proceed to
      Direct No misfire counts, or misfire counts occur randomly in all cylinders A
      Misfire counts occur in a particular cylinder B
      Tip:

      Perform "Inspection After Repair" after replacing the fuel injector assembly (for direct injection).

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  5. Click here

    CHECK FUEL PRESSURE SENSOR


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Start the engine.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Target Fuel Pressure / All Data / Fuel Press.


      1. Powertrain > Engine > Active Test
        Active Test Display
        Control the Target Fuel Pressure
        Data List Display
        Fuel Press





    5. Check that the fuel pressure fluctuates when the target fuel pressure changes.

      Tip:

      The Active Test operation lowers the target fuel pressure by 12.5% or increase the target fuel pressure by 24.8%.

      Result
      Result Proceed to
      Fuel pressure does not rise A
      Fuel pressure does not fluctuate B
      Fuel pressure fluctuates C

  6. Click here

    CHECK FUEL PUMP OPERATION (FOR LOW PRESSURE SIDE)


    1. Check the fuel pump operation (for low pressure side).

      Click here

      Result
      Proceed to
      OK
      NG

  7. Click here

    CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)


    1. Check the fuel pressure (for low pressure side).

      Click here

      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE FUEL SYSTEM (PRESSURE REGULATOR, PIPE LINE AND FILTER)

  8. Click here

    INSPECT INJECTOR DRIVER (NO. 1 AND NO. 2)


    1. Turn the engine switch off.

    2. Replace the No. 1 and No. 2 injector drivers with known good ones from another vehicle.

      Note:

      Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged.

    3. Connect the GTS to the DLC3.

    4. Start the engine.

    5. Clear the DTCs.

      Click here

    6. Turn the engine switch off and wait for at least 30 seconds.

    7. Turn the engine switch on (IG) and turn the GTS on.

    8. Perform the driving test.

    9. Enter the following menus: Powertrain / Engine / Trouble Codes.

    10. Read the DTCs.


      1. Powertrain > Engine > Trouble Codes


      Result
      Result Proceed to
      DTC P0087 is output A
      DTCs are not output B

  9. Click here

    REPLACE FUEL PUMP (FOR HIGH PRESSURE SIDE)


    1. Replace the fuel pump (for high pressure side).

      Click here

      Tip:

      Perform "Inspection After Repair" after replacing the fuel pump (for high pressure side).

      Click here

      Result
      Proceed to
      NEXT

  10. Click here

    CHECK IF DTC OUTPUT RECURS (SEE IF DTC P0087 IS OUTPUT AGAIN)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Clear the DTCs.

      Click here


      1. Powertrain > Engine > Clear DTCs


    4. Turn the engine switch off and wait for at least 30 seconds.

    5. Turn the engine switch on (IG) and turn the GTS on.

    6. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

    7. Enter the following menus: Powertrain / Engine / Trouble Codes.

    8. Read the DTCs.


      1. Powertrain > Engine > Trouble Codes


      Result
      Result Proceed to
      DTC P0087 is output A
      DTCs are not output B