ECD SYSTEM (w/o DPF), Diagnostic DTC:P0088

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

DESCRIPTION

Refer to System Description Click here.

P0088
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
After idling for 60 seconds, repeat quick engine speed accelerations (to 2500 rpm) for 30 seconds

The fuel pressure of common rail is too high

The fuel pressure exceeds 230 MPa (2345 kgf/cm2, 33358 psi) (1 trip detection logic).

  • Fuel supply pump (suction control valve)

  • Pressure limiter (common rail (for Bank 2))

  • Open or short in fuel supply pump (suction control valve) circuit

  • ECM
Related Data List
DTC No. Data List
P0088

  • Fuel Press

  • Target Common Rail Pressure

  • Injection Pressure Correction

  • Target Pump SCV Current

Tech Tips


  • For more information on the fuel supply pump (suction control valve) and common rail system, refer to System Description Click here.

  • When DTC P0088 is stored, check the internal fuel pressure of the common rail by entering the following menus: Powertrain / Engine / Data List / Fuel Press.

    Reference
    Engine Speed Fuel Press
    Idling Approximately 27 to 37 MPa
    2500 rpm (No engine load) Approximately 50 to 70 MPa

  • When there is an operating problem with the fuel supply pump (when Fuel Press is more than Target Common Rail Pressure due to a problem with the closing of the suction valve), the values of Injection Pressure Correction and Target Pump SCV Current decrease.

MONITOR DESCRIPTION

P0088 (Internal fuel pressure too high):

The ECM stores this DTC if the fuel pressure inside the common rail is more than 230 MPa (2345 kgf/cm2, 33350 psi). This DTC indicates that: 1) the suction control valve may be stuck open, or 2) there may be a short in the suction control valve circuit.

If this DTC is stored, the ECM enters fail-safe mode and limits the engine power. The fail-safe mode continues until the ignition switch is turned off.

WIRING DIAGRAM

A015BTAE08

INSPECTION PROCEDURE

Note


  • After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

  • After replacing the fuel supply pump, the ECM needs initialization Click here.

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. INSPECT FUEL SUPPLY PUMP (SUCTION CONTROL VALVE)


    1. Disconnect the suction control valve connector and then start the engine.

      OK
      Engine does not start.

    NG

    REPLACE FUEL SUPPLY PUMP Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / Target Pump SCV Current.

    5. Read the value.

      Standard
      Engine Speed Target Pump SCV Current
      Idling 923 to 1123 mA
      2500 rpm (No engine load) 1013 to 1212 mA

    NG

    REPLACE FUEL SUPPLY PUMP Click here

    OK

  3. READ VALUE USING INTELLIGENT TESTER (FUEL PRESS)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / Fuel Press, Target Common Rail Pressure.

    5. Check the difference in pressure between Fuel Press and Target Common Rail Pressure.

      OK
      Difference in pressure between Fuel Press and Target Common Rail Pressure is within +/-5 MPa.

    NG

    CHECK HARNESS AND CONNECTOR (SUCTION CONTROL VALVE CONNECTOR - ECM) Click here

    OK

  4. REPLACE PRESSURE LIMITER (COMMON RAIL (for Bank 2))


    1. Replace the common rail (for Bank 2) Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. CHECK HARNESS AND CONNECTOR (SUCTION CONTROL VALVE CONNECTOR - ECM)


    1. A015A9JE04

      Disconnect the suction control valve connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open)
      for LHD
      Tester Connection Condition Specified Condition
      z64-2 (PCV) - C45-105 (PCV-) Always Below 1 Ω
      z64-1 (+B) - C45-106 (PCV+) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      z64-2 (PCV) - C46-105 (PCV-) Always Below 1 Ω
      z64-1 (+B) - C46-106 (PCV+) Always Below 1 Ω
      Standard Resistance (Check for short)
      for LHD
      Tester Connection Condition Specified Condition
      z64-2 (PCV) or C45-105 (PCV-) - Body ground Always 10 kΩ or higher
      z64-1 (+B) or C45-106 (PCV+) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      z64-2 (PCV) or C46-105 (PCV-) - Body ground Always 10 kΩ or higher
      z64-1 (+B) or C46-106 (PCV+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  6. REPLACE FUEL SUPPLY PUMP


    1. Replace the fuel supply pump Click here.


    NEXT

  7. CHECK DTC OUTPUT


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off.

    4. Start the engine.

    5. After idling for 60 seconds, repeat engine speed accelerations (from idling to 2500 rpm) for 30 seconds.

    6. Enter the following menus: Powertrain / Engine / DTC.

    7. Read the DTCs.

      Result
      Display (DTC output) Proceed to
      P0088 is output A
      No DTC is output B

    B

    END

    A

  8. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  9. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

  10. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON and start the engine.

    5. After idling for 60 seconds, repeat engine speed accelerations (from idling to 2500 rpm) for 30 seconds.

    6. Confirm that the DTC is not output again.

      Tech Tips

      Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.


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

      2. Input DTC P0088.

      3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, race the engine to 2500 rpm repeatedly for 30 seconds and increase idling time.


    NEXT

    END