SFI SYSTEM, Diagnostic DTC:P008700

DTC Code DTC Name
P008700 Fuel Rail / System Pressure - Too Low

DESCRIPTION

The high-pressure direct injection fuel system consists of a spill control valve, check valve, fuel relief valve, fuel pressure sensor, fuel pump assembly (for high pressure side) and direct fuel injector assemblies. The spill control valve adjusts the return volume of high-pressure fuel. The check valve mechanically opens and closes the path to the fuel delivery pipe. The relief valve releases the fuel back to the fuel tank if there is a malfunction in the high-pressure fuel system. The fuel pump assembly (for high pressure side) is installed to the cylinder head cover and operated by a cam installed to the end of the intake camshaft. Rotation of the camshaft moves the pump plunger inside the fuel pump assembly (for high pressure side) up and down, pressurizing the fuel. The pressurized fuel opens the check valve and is pumped into the fuel delivery pipe. The ECM controls the spill control valve to adjust the fuel pressure between 3.4 and 20 MPa (35 and 204 kgf/cm2) and monitors signals from the fuel pressure sensor (for high pressure side) to maintain the target fuel pressure.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P008700 Fuel Rail / System Pressure - Too Low

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

  • Leak of fuel

  • Fuel pipe (fuel tank - fuel pump assembly (for high pressure side))

  • Fuel pipe (fuel pump assembly (for high pressure side) - direct fuel injector assembly)

  • Direct fuel injector assembly

  • Fuel pump assembly (for high pressure side)

  • Fuel pump (for low pressure side)

  • Fuel pressure sensor (for high pressure side)

  • Fuel system

  • ECM

 Comes on DTC stored

SAE Code:

P0087

MONITOR DESCRIPTION

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

MONITOR STRATEGY

Required Sensors/Components Fuel pressure sensor (for high pressure side)
Frequency of Operation Continuous

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 the engine speed, engine load and other conditions displayed in the freeze frame data, reproduce the conditions present when the DTC was stored.

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

  10. Read the pending DTCs.

    Tech Tips


    • 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: P008700.

  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

    Tech Tips


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

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

CAUTION / NOTICE / HINT

Tech Tips

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.

PROCEDURE


  1. CHECK FUEL LEAK


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

      OK
      No fuel leaks present.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE FUEL LEAK POINT

    OK

  2. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P008700)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P008700 is output A
      DTC P008700 and other DTCs are output B

      Tech Tips

      If any DTCs other than P008700 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  3. 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

    NO

  4. CHECK MISFIRE COUNT OF DIRECT INJECTION


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Start the engine and warm it up.

    5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Mode / Data List / Injection Mode and Misfire Count Cylinder #1 to Misfire Count Cylinder #4.


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Injection Mode
      Data List Display
      Injection Mode
      Misfire Count Cylinder #1
      Misfire Count Cylinder #2
      Misfire Count Cylinder #3
      Misfire Count Cylinder #4

      Tech Tips


      • When using the "Control the Injection Mode" Active Test to check the condition of the engine, switch from "Port" to "Direct".

      • Do not switch from "Direct" to "Port". When performing the inspection more than once, after the Active Test ends, lightly race the engine, and then perform the inspection from "Port" again.

      • If the display does not switch from "Port" even after lighting racing the engine, idle the engine for approximately 1 minute, and then lightly race the engine.

    6. According to the display on the GTS, read the Data List with the Active Test "Control the Injection Mode" set to Direct.

      Result
      Injection Mode Misfire Count Proceed to
      Direct There are no misfire counts A
      3 cylinders or more have misfire counts
      1 or 2 cylinders have misfire counts B

      Tech Tips

      Perform "Inspection After Repair" after replacing the direct fuel injector assembly.

      Click here


    B

    REPLACE DIRECT FUEL INJECTOR ASSEMBLY Click here

    A

  5. CHECK FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE)


    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 / Data List / Fuel Pressure (High).


      Powertrain > Engine > Data List
      Tester Display
      Fuel Pressure (High)

    4. Start the engine.

    5. Check that the fuel pressure fluctuates when the engine condition changes from idling to racing.

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

      Tech Tips

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

      Click here


    B

    REPLACE FUEL DELIVERY PIPE SUB-ASSEMBLY (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE)) Click here

    C

    GO TO STEP 8 Click here

    A

  6. 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

    NG

    GO TO FUEL PUMP CONTROL CIRCUIT Click here

    OK

  7. CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)


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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE FUEL SYSTEM

    OK

  8. REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE)


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

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK IF DTC OUTPUT RECURS (SEE IF DTC P008700 IS OUTPUT AGAIN)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

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

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

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

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

    10. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P008700 is output A
      DTCs are not output B

    A

    REPLACE ECM Click here

    B

    END