ECD SYSTEM(for DPF), Diagnostic DTC:P1229

DTC Code DTC Name
P1229 Fuel Pump System

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P1229

Fuel Pump System

The actual fuel pressure exceeds the target fuel pressure by 5000 kPa or higher for 30 seconds.

(1 trip detection logic)

  • Short in suction control valve circuit

  • Suction control valve

  • Fuel pressure sensor (common rail assembly)

  • ECM

Comes on

DTC stored
Table 1. Related Data List

DTC No.

Data List

P1229

  • Fuel Press

  • Target Common Rail Pressure

  • Injection Pressure Correction

  • Target Pump SCV Current

  • Pump SCV Learning Value
Tip:

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

  • When DTC P1229 is stored, check the internal fuel pressure of the common rail by entering the following menus: Powertrain / Engine and ECT / Data List / Fuel Press, Target Common Rail Pressure.

    Under a stable condition such as idling after warm up the engine, Fuel Press is within +/- 5000 kPa of Target Common Rail Pressure when normal.

  • When there is a problem with the movement of the fuel supply pump assembly (when Fuel Press is higher than Target Common Rail Pressure due to a problem in which the suction valve has difficulty closing), the values of Injection Pressure Correction and Target Pump SCV Current decrease.

MONITOR DESCRIPTION

P1229 (Fuel over-feed):

The ECM stores this DTC if the actual fuel pressure inside the common rail remains higher than the target fuel pressure, despite the ECM closing the suction control valve. This DTC indicates that the suction control valve may be stuck open, or there may be a short in its 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.

CONFIRMATION DRIVING PATTERN

DTC No.

DTC Detection Drive Pattern

P1229

Idling for 60 seconds

WIRING DIAGRAM

A205135E01

CAUTION / NOTICE / HINT

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).

Tip:

  • 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.

  • When this DTC is stored, be sure to carefully examine "Fuel Press", "Target Common Rail Pressure", "Target Pump SCV Current", and "Pump SCV Learning Value" in the freeze frame data.

PROCEDURE

  1. CHECK OTHER DTC 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 > Trouble Codes

    4. Read the DTCs.

      Result

      Result

      Proceed to

      Except above

      A

      DTC P1229 and "P0190, P0192 and/or P0193" are output

      B
    B

    GO TO FUEL RAIL PRESSURE SENSOR CIRCUIT

    Click here

    A

  2. READ VALUE USING GTS (FUEL PRESS AND TARGET COMMON RAIL PRESSURE)

    1. Connect the GTS to the DLC3.

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

    3. Start the engine and warm it up.

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

      Powertrain > Engine > Data List

      Tester Display

      Target Common Rail Pressure

      Fuel Press

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

      OK

      Fuel Press is within 5000 kPa of Target Common Rail Pressure when engine is idling after warm up the engine.

    Result

    Proceed to

    OK

    NG
    OK

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

    NG

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

    1. 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

      Tester Connection

      Condition

      Specified Condition

      B48-1 - B76-41 (PCV+)

      Always

      Below 1 Ω

      B48-2 - B76-81 (PCV-)

      Always

      Below 1 Ω

      B48-1 or B76-41 (PCV+) - Body ground

      Always

      10 kΩ or higher

      B48-2 or B76-81 (PCV-) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE FUEL FILTER ELEMENT ASSEMBLYClick here

    NG

  4. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

    Result

    Proceed to

    NEXT
    NEXT

  5. PERFORM ACTIVE TEST USING GTS (TEST THE FUEL LEAK)

    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 / Test the Fuel Leak / Data List / Fuel Press, Target Common Rail Pressure.

      Powertrain > Engine > Active Test

      Active Test Display

      Test the Fuel Leak

      Data List Display

      Target Common Rail Pressure

      Fuel Press

    4. Take a snapshot with the GTS during the Active Test.

    5. Measure the difference between the target fuel pressure (Target Common Rail Pressure) and the actual fuel pressure (Fuel Press) when the "Test the Fuel Leak" Active Test is performed.

      Click here

      Tip:

      In order to obtain an exact measurement, perform the Active Test 5 times and measure the difference once each time the Active Test is performed.

      OK

      The difference between the target fuel pressure and the actual fuel pressure 2 seconds after the Active Test starts is less than 10000 kPa.

      Result

      Result

      Proceed to

      Except above

      A

      The difference between the target fuel pressure and the actual fuel pressure 2 seconds after the Active Test starts is less than 10000 kPa.

      B
    B

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

    A

  6. REPLACE FUEL FILTER ELEMENT ASSEMBLY

    1. Replace the fuel filter element assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  7. REPLACE SUCTION CONTROL VALVE

    1. Replace the Replace the suction control valve.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  8. BLEED AIR FROM FUEL SYSTEM

    1. Bleed the air from the fuel system.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  9. PERFORM SUPPLY PUMP INITIALIZATION

    1. Perform supply pump initialization.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  10. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

    5. Turn the ignition switch off for 30 seconds or more.

    6. Start the engine.

    7. Idle the engine for 60 seconds, and then run it at 2500 rpm without load for 60 seconds.

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

      Powertrain > Engine > Trouble Codes

    9. Confirm that the DTC is not output again.

      Tip:

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

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

        Powertrain > Engine > Utility

        Tester Display

        All Readiness

      2. Input DTC P1229.

      3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or N/A, increase the idling time.

    Result

    Proceed to

    NEXT
    NEXT

    END