ECD SYSTEM, Diagnostic DTC:P0087,P1092,P1094,P1097 and P1099

DTC Code DTC Name
P0087 Fuel Rail / System Pressure - Too Low
P1092 Maximum Positive Deviation of Rail Pressure Exceeded Concerning Set Flow of Fuel
P1094 Rail Pressure below Threshold during Start
P1097 Minimum Rail Pressure Exceeded
P1099 Maximum Positive Deviation of Rail Pressure Exceeded Concerning Set Value PCV

DESCRIPTION

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

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0087

Fuel Rail / System Pressure - Too Low

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

  • When rail pressure control is performed according to the fuel quantity control valve, the positive control deviation is the standard value or higher for 0.9 seconds.

  • When rail pressure control is performed according to the fuel quantity control valve, the minimum rail pressure is the standard value (approximately 12000 kPa to 14000 kPa) or less for 0.3 seconds.

  • When rail pressure control is performed according to the pressure discharge valve assembly, the positive control deviation is the standard value or higher for 0.8 seconds.

  • When rail pressure control is performed according to the pressure discharge valve assembly, the minimum rail pressure is the standard value (approximately 12000 kPa) or less for 0.3 seconds.

Tip:

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

  • Fuel filter element clogged

  • Fuel leak

  • Injector assembly

  • Lack of fuel

  • Fuel line (air bleeding)

  • Pressure discharge valve assembly

  • Fuel pressure sensor

  • ECM

Comes on

DTC stored

P1092

Maximum Positive Deviation of Rail Pressure Exceeded Concerning Set Flow of Fuel

When positive control deviation is more than 20000 kPa and volumetric flow via fuel quantity control valve reaches or exceeds the threshold for 0.9 seconds.

(3 trip detection logic)

  • Fuel quantity control valve (fuel supply pump assembly)

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

  • Fuel filter element clogged

  • Fuel leak

  • Injector assembly

  • Lack of fuel

  • Fuel line (air bleeding)

  • Pressure discharge valve assembly

  • Fuel pressure sensor

  • ECM

Does not come on

DTC stored

P1094

Rail Pressure below Threshold during Start

When the common rail internal pressure is 18000 kPa or lower regardless of whether the engine speed is 160 rpm or higher after the engine is started, a counter is increased every 10 msec. If the counter exceeds a predetermined value for 0.6 seconds.

(3 trip detection logic)

  • Fuel quantity control valve (fuel supply pump assembly)

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

  • Fuel filter element clogged

  • Fuel leak

  • Injector assembly

  • Lack of fuel

  • Fuel line (air bleeding)

  • Pressure discharge valve assembly

  • Fuel pressure sensor

  • ECM

Does not come on

DTC stored

P1097

Minimum Rail Pressure Exceeded

Common rail internal pressure is less than 12000 to 14000 kPa (varies with engine speed) for 0.3 seconds.

(3 trip detection logic)

  • Fuel leakage (high pressure area)

  • Fuel injector (Injector jammed open)

  • Fuel quantity control valve (fuel supply pump assembly)

  • Injector assembly

  • Pressure discharge valve assembly

  • Fuel pump (Low pressure side)

  • Fuel filter element clogged

Comes on

DTC stored

P1099

Maximum Positive Deviation of Rail Pressure Exceeded Concerning Set Value PCV

When rail pressure control is performed according to the pressure discharge valve assembly, the positive control deviation is 15000 kPa or higher for 0.75 seconds.

(3 trip detection logic)

  • Fuel pump (Low pressure side)

  • Fuel filter element clogged

  • Fuel pressure sensor

  • Leakage (high pressure area)

  • Injector assembly

  • Fuel quantity control valve (fuel supply pump assembly)

  • Pressure discharge valve assembly

  • Common rail system

Does not come on

DTC stored
Table 1. Related Data List

DTC No.

Data List

P0087

P1092

P1094

P1097

P1099

  • 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 and/or injector assembly, 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 assembly, the ECM needs initialization.

    Click here

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

Tip:

  • 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.

      Powertrain > Engine and ECT > Trouble Codes

    4. Read the DTCs.

      Result

      Result

      Proceed to

      DTC P0087, P1092, P1094, P1097 and/or P1099

      A

      DTC P0087, P1092, P1094, P1097 and/or P1099 and other DTCs

      B
      Tip:

      If any DTCs other than P0087, P1092, P1094, P1097 and/or P1099 are output, troubleshoot those DTCs first.

    B

    GO TO DTC CHART

    Click here

    A

  2. CHECK FUEL RECEIVER GAUGE (AMOUNT OF FUEL)

    1. Check if the fuel level is low.

      Result

      Result

      Result

      Proceed to

      The indicator (fuel warning light) is illuminated

      The indicator (fuel warning light) is illuminated

      A

      The indicator (fuel warning light) is not illuminated

      The indicator (fuel warning light) is not illuminated

      B
    B

    CLEAR DTCClick here

    A

  3. ADD FUEL

    Result

    Proceed to

    NEXT
    NEXT

  4. CHECK FUEL PUMP OPERATION AND INSPECT FOR FUEL LEAK

    1. Check the fuel pump operation and for fuel leaks.

      Tip:

      If the fuel pump operation cannot be performed, inspect the fuel pump control circuit.

    Result

    Proceed to

    NEXT
    NEXT

  5. CHECK WHETHER DTC OUTPUT RECURS (DTC P0087, P1092, P1094, P1097 AND/OR P1099)

    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

    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.

      Powertrain > Engine and ECT > Trouble Codes

    8. Read the DTCs.

      Result

      Result

      Result

      Proceed to

      No DTC output

      No DTC output

      A

      DTC P0087, P1092, P1094, P1097 and/or P1099

      DTC P0087, P1092, P1094, P1097 and/or P1099

      B
    A

    DTC CAUSED BY RUNNING OUT OF FUEL

    B

  6. CLEAR DTC

    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  7. CHECK ENGINE STARTING CONDITION

    1. Check the engine starting condition.

      OK

      The engine can be started within 4 seconds.

      Note:

      Just after starting the engine, visually check for fuel leaks from the fuel supply pump assembly, the injector assemblies, the common rail assembly, and the fuel pipes in high-pressure areas.

    Result

    Proceed to

    OK

    NG
    OK

    CHECK PRESSURE DISCHARGE VALVE ASSEMBLYClick here

    NG

  8. CHECK FUEL PRESSURE (LOW PRESSURE)

    1. Check the fuel pressure.

      Click here

    Result

    Proceed to

    OK

    NG
    OK

    CHECK PRESSURE DISCHARGE VALVE ASSEMBLYClick here

    NG

  9. CHECK AND REPLACE FUEL INLET PIPE

    1. Check the following items (fuel line from fuel tank to supply pump), and repair or replace the malfunctioning part if necessary.

      1. Check for fuel filter clogging.

      2. Check for fuel freezing in the fuel line when the cold condition.

      3. Check for clogging or leaks in the fuel pipe and hose between the fuel tank and fuel supply pump assembly.

    Result

    Proceed to

    NEXT
    NEXT

  10. CHECK PRESSURE DISCHARGE VALVE ASSEMBLY

    1. Inspect the pressure discharge valve assembly.

    2. Perform Active Test.

      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.

        Powertrain > Engine and ECT > Active Test

        Active Test Display

        Actuator Test of Pressure Control Valve

        Data List Display

        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.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE PRESSURE DISCHARGE VALVE ASSEMBLYClick here

    OK

  11. CHECK FUEL SUPPLY PUMP ASSEMBLY

    1. Remove the fuel quantity control valve and visually check that there are no foreign objects such as scraps in the fuel supply pump assembly.

      OK

      No foreign objects present.

      Tip:

      If foreign objects are present, replace all parts of the high pressure fuel system (fuel supply pump assembly, common rail assembly and fuel hose), and then check that there are no foreign objects such as scraps in the low pressure fuel system (inner part of the fuel tank, low pressure fuel pump and fuel hose).

    2. Check the Data List.

      1. Connect the GTS to the DLC3.

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

      3. Start the engine.

      4. Enter the following menus: Powertrain / Engine and ECT / Data List / Target Common Rail Pressure and Common Rail Pressure.

        Powertrain > Engine and ECT > Data List

        Tester Display

        Target Common Rail Pressure

        Common Rail Pressure

      5. 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.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE FUEL SUPPLY PUMP ASSEMBLYClick here

    OK

  12. PERFORM ACTIVE TEST USING GTS (FUEL BALANCING COMPENSATION (FBC))

    Tip:

    If the Active Test cannot be performed due the engine failing to start, replace the injector assembly and proceed to procedure 13, "CHECK WHETHER DTC OUTPUT RECURS (DTC P0087, P0088, P1092 or P1094)".

    1. Connect the GTS to the DLC3.

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

    3. Start the engine.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Fuel Balancing Compensation (FBC) / Data List / Cylinder 1 Quantity Compensation to Cylinder 4 Quantity Compensation.

      Powertrain > Engine and ECT > Active Test

      Active Test Display

      Fuel Balancing Compensation (FBC)

      Data List Display

      Cylinder 1 Quantity Compensation

      Cylinder 2 Quantity Compensation

      Cylinder 3 Quantity Compensation

      Cylinder 4 Quantity Compensation

    5. Read the value.

      Standard value

      -5.0 to 4.0 mg/stk

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE INJECTOR ASSEMBLYClick here

    OK

  13. CHECK WHETHER DTC OUTPUT RECURS (DTC P0087, P0088, P1092 OR P1094)

    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

    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.

      Powertrain > Engine and ECT > Trouble Codes

    8. Read the DTCs.

      Result

      Result

      Result

      Proceed to

      No DTC output

      A

      DTC P0087, P0088, P1092 or P1094

      B
    A

    END

    B

  14. REPLACE FUEL PRESSURE SENSOR

    1. Replace the fuel pressure sensor.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  15. REPLACE INJECTOR ASSEMBLY

    1. Replace the injector assembly of malfunctioning cylinder.

      Click here

    2. Register the injector assembly compensation code.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  16. REPLACE FUEL SUPPLY PUMP ASSEMBLY

    1. Replace the fuel supply pump assembly.

      Click here

    2. Perform the supply pump learning value reset.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  17. REPLACE PRESSURE DISCHARGE VALVE ASSEMBLY

    1. Replace the pressure discharge valve assembly.

      Click here

    2. Perform the fuel PCV compensation value reset.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  18. 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.

      Powertrain > Engine and ECT > Clear DTCs

    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.

      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

    Result

    Proceed to

    NEXT
    NEXT

    END