ECD SYSTEM, Diagnostic DTC:P0088, P1098

DTC Code DTC Name
P0088 Fuel Rail / System Pressure - Too High
P1098 Maximum Rail Pressure Exceeded

DESCRIPTION

For information on the fuel system, refer to System Description Click here.

DTC No. DTC Detection Condition Trouble Area
P0088

One of following conditions is met (1 trip detection logic):


  • When rail pressure control is performed according to the fuel quantity control valve, the negative control deviation is the standard value or higher for 2 seconds.

  • When rail pressure control is performed according to the fuel quantity control valve, the rail pressure is the standard value (approximately 175000 kPa) or more for 0.24 seconds.

  • When rail pressure control is performed according to the pressure discharge valve, the negative control deviation is the standard value or higher for 2 seconds.

  • When rail pressure control is performed according to the pressure discharge valve, the rail pressure is the standard value (approximately 215000 kPa) or more for 0.24 seconds.

Tech Tips

The detection standard value is calculated according to the engine speed and vehicle speed.

  • Fuel quantity control valve (fuel supply pump assembly)

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

  • Pressure discharge valve

  • Open or short in pressure discharge valve circuit

  • ECM
DTC No. DTC Detection Condition Trouble Area
P1098

Common rail internal pressure is 215000 kPa or more for 0.3 seconds.

(3 trip detection logic)

  • Pressure discharge valve (jammed closed)

  • Fuel quantity control valve (stuck open) (fuel supply pump assembly)
Related Data List
DTC No. Data List

P0088

P1098

  • Target Common Rail Pressure

  • Common Rail Pressure

  • Quantity Regulation Valve - Current Value from Common Rail

  • Quantity Regulation Valve - Output Duty Cycle

  • Rail Pressure Control Valve - Current Value from Rail Pressure Valve Control

  • Dutycycle Output of Rail Pressure Control Valve

CAUTION / NOTICE / HINT

Note


  • When replacing the ECM, the ECM needs Registration and Initialization Click here.

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

  • After replacing the pressure discharge valve, the ECM needs initialization Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. 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. CHECK ANY OTHER DTCS OUTPUT


    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 and ECT / Trouble Codes.

    4. Read the DTCs.

      Result
      Result Proceed to
      DTC P0088 and/or P1098 A
      DTC P0088 and/or P1098 and other DTCs B

      Tech Tips

      If any DTCs other than P0088 and/or P1098 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (ACTUATOR TEST OF PRESSURE CONTROL)


    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 and ECT / Active Test / Actuator Test of Pressure Control Valve / Data List / Dutycycle Output of Rail Pressure Control Valve.

      OK
      The value of "Dutycycle Output of Rail Pressure Control Valve" changes according to the amount "Actuator Test of Pressure Control Valve" is operated.

    NG

    REPLACE PRESSURE DISCHARGE VALVE Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS (COMMON RAIL PRESSURE AND TARGET COMMON RAIL)


    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 and ECT / Data List / Target Common Rail Pressure and Common Rail Pressure.

    4. Check that the internal fuel pressure of the common rail is within the specification below.

      OK
      Common Rail Pressure is within 10000 kPa of Target Common Rail Pressure when the engine is idling and running at 3000 rpm without load.

    OK

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    NG

    REPLACE FUEL SUPPLY PUMP ASSEMBLY Click here

  4. REPLACE PRESSURE DISCHARGE VALVE


    1. Replace the pressure discharge valve Click here.

    2. Perform the fuel PCV compensation value reset Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. REPLACE FUEL SUPPLY PUMP ASSEMBLY


    1. Replace the fuel supply pump assembly Click here.

    2. Perform the supply pump learning value reset Click here.


    NEXT

  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

    7. Enter the following menus: Engine and ECT / Trouble Codes.

    8. Confirm that the DTC is not output again.


    NEXT

    END