SFI SYSTEM, Diagnostic DTC:P0088

DTC Code DTC Name
P0088 Fuel Rail / System Pressure - Too High

DESCRIPTION

Refer to DTC P0087 Click here.

DTC No. DTC Detection Condition Trouble Area
P0088

Fuel pressure is higher than the target value for 10 seconds or more.

(1 trip detection logic)

  • Fuel pump assembly (for high pressure)

  • ECM

MONITOR DESCRIPTION

If the fuel pressure does not decrease even after the ECM commands the high-pressure fuel pump to open the spill control valve, a DTC is output.

If there is minimal difference between the fuel pressure before and after the fuel relief valve operates, a DTC is output.

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON 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) Click here.

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

  6. Turn the ignition switch to ON and turn the GTS on.

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

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

  9. Read the DTC.

    Tech Tips


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

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

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

  11. Input the DTC: P0088.

  12. 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's memory limit

    Tech Tips


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

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

  13. If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips


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

    • If no permanent DTC is output, the system is normal.

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 be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0088)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

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

    4. Read the DTCs.

      Result
      Result Proceed to
      DTC P0088 is output A
      DTC P0088 and other DTCs are output B

      Tech Tips

      If any DTCs other than P0088 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

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

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

      Tech Tips

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

      OK
      Fuel pressure fluctuates.

    NG

    REPLACE FUEL PRESSURE SENSOR Click here

    OK

  3. REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE)


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


    NEXT

  4. CHECK IF DTC OUTPUT RECURS (SEE IF DTC P0088 IS OUTPUT AGAIN)


    1. Connect the GTS to the DLC3.

    2. Turn the GTS on.

    3. Clear the DTCs Click here.

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

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

    6. Read the DTCs.

      Result
      Result Proceed to
      DTC P0088 is output A
      DTC is not output B

    A

    REPLACE ECM Click here

    B

    END